Modifiers for inter-metallic layer

FIELD: forming inter-metallic layer on metal part, especially on parts of jet engine at air flow over it.

SUBSTANCE: proposed method includes application of modifier on at least one selected section of metal part surface. Then metal part is placed in sedimentation medium and donor material acts on selected section of part surface during period of time sufficient for forming inter-metallic layer containing metal obtained from donor material. Modifier forms inter-metallic layer on this modified section of surface. Thickness of inter-metallic layer exceeds thickness of inter-metallic layer formed on said section of surface subjected to action of donor material in sedimentation medium without modifier applied on it preliminarily. Modifier is selected from group consisting of metal halogen Lewis acid, silane material and colloid silicon oxide.

EFFECT: facilitated procedure of forming inter-metallic layer of required thickness.

41 cl, 13 dwg

 

1. The scope of the invention

The present invention relates to the formation of the intermetallic layer on the metal parts and, in particular, to the formation of the intermetallic layer on the surface of metal parts of a jet engine, a streamlined air flow.

2. Prior inventions

The surface of metal parts (i.e. parts or elements), it is often necessary to process for the formation therein of the intermetallic layer, which protects the underlying metal part and thus prolong its life. For example, in the aerospace industry many of the parts in a jet engine or other nodes of the aircraft equipped with aluminium layer designed to protect surfaces, streamlined air flow, from corrosion. Over time aluminides layer will wear out, and so it must be restored. In such cases, the oxide layer and the remaining aluminides or other intermetallic layer at the part is removed, for example by removal of the coating in acid and/or by shot peening to exposure of the underlying metal surface of the part. The metal part, such as part of a jet engine made from supersplash Nickel-based or cobalt-based, then placed, nab is emer, in conventional CVD furnace (from the English. chemical vapor deposition - chemical vapor deposition), and is exposed to the environment of deposition, for example, in near-vacuum conditions and at high temperatures using appropriate activators and donor materials that form the intermetallic layer. When the intermetallic layer should be aluminium, the donor material may be aluminum, for example, in the form of pieces of chromium-aluminum or cobalt-aluminum. In the environment of deposition of aluminum released from such pieces and forms part of supersplash Nickel-based Nickel-aluminides layer (this layer may be called for simplicity and brevity aluminium layer). Aluminides layer includes an additional part of growing up outside of the original metal surface and having a high concentration of aluminum. Aluminides layer can also include a diffusion portion that partially extends into the details of the level of its original surface and which will have a high concentration forming part of metal, such as Nickel. The same process can be used for new parts after removal of the natural oxide layer that may be formed on the workpiece during its manufacture.

Intermetallic layer to form or build up a need is my total thickness exposing the part, and in particular its surface, the environment of deposition for a given period of time sufficient for the formation of such a layer. The length of time required for a conventional CVD furnace for a full cycle, inevitably limits the number of parts that can be processed in the specified furnace for a given period of time, such as during a shift. Reducing the time cycle will be beneficial in the sense that during a shift can be processed more detail, which will lead to lower costs per item. Unfortunately, although the process variables can be adjusted in ways that may have some minor impact on the time required to form the desired thickness of the intermetallic layer, attempts to significantly reduce the time usually require undesirable changes in process variables. Such changes in process variables can be undesirable from a cost perspective or security and/or from the point of view of product quality. Thus, there remains a need to reduce the time cycle, but without unwanted changes to process variables that affect the environment of deposition.

In addition to the above it is noted that there are some situations in which it is desirable to form a multi-component in armellini layer, that is, the intermetallic layer, which includes a functional material, different from the one which is obtained from a donor (e.g., aluminum) or from part (for example, Nickel). In the aerospace industry, for example, for a long period of time was desirable inclusion in aluminides layer of silicon, chromium or platinum in order to improve the service quality of the intermetallic opaque layer. Conventional attempts to include silicon were largely unsuccessful. Although the addition of chromium or platinum was carried out, the process by which complied with the addition of these metals, was difficult and expensive. As an example, platinum may be added first by electrolytic coating platinum pure metal surface before exposure to the detail of the environment of deposition to form aluminide layer. It is assumed that during the deposition aluminide layer of platinum atoms are released from electroplating and migrate to Aluminiy layer, thus providing the required strong and durable platinum-aluminerie the coating layer. Although the addition of platinum provides obtaining a desirable image of an improved metal parts from the point of view of its durability and service life, the electrolytic coating of the of men platinum is an expensive and difficult procedure. Therefore, there remains a need for an easy and inexpensive way to add additional functional material in the intermetallic layer for formation of a multi-component layer.

The invention

The present invention provides an improved deposition method is intended for the formation of the intermetallic layer on the metal parts, which eliminated some of the above disadvantages. To this end and in accordance with the principles of the present invention on the surface of metal parts, which should form the intermetallic layer, first put the modifier (seed). The modifier can be applied to the entire surface or it can be applied selectively to one or more areas of the surface of metal parts. Modifier mainly applied in liquid form and then dried to education pre-coating of the modifier. Pre-coated component is then placed in the environment of deposition, which is formed intermetallic layer. It was found that the intermetallic layer grows or is produced in such a pre-coated surface more quickly than would occur without the modifier. Thus, the surface, which is pre-coated with a modifier, the alignment surface, they are not covered, is formed thicker intermetallic layer. The result is compared with the traditional method of deposition of the desired thickness of the intermetallic layer can be obtained within a smaller period of time. This result can be used to best reduce the time cycle of a conventional CVD furnace that provides desirable benefits, expressed in cost reduction, and so an Alternative, more thick intermetallic layer can be advantageous way formed in the case, when a time cycle with pre-coated part is essentially not reduced in comparison with the item, which previously was not covered. It should be borne in mind that used in the present description the term "modifier" refers to a material which when applied to the metal surface, which then is exposed to the environment of deposition, will call on such a surface the more rapid formation of intermetallic layer or formation of a layer of greater thickness in comparison with the surface not covered by the modifier. So, for example, mainly modifier can be celanova material or Lewis acid.

In addition to the above, depending on what station details pre-coated with modifier, on the same part of the mod is but to form two intermetallic layer of a different thickness. With such selective coverage details on those areas that need the most protection, can be formed to the desired thick intermetallic layer, whereas in areas that are less susceptible to damage, such as corrosion, can be provided over a thin layer. In one particular application of the modifier may be applied to the streamlined(s) air flow surface(s) jet engine (such as a spatula) for further education is desirable Tolstoy aluminide coating on the surface. Other parts of the vanes, such that you can join to other parts of the engine, not previously covered, and so on such sites can be formed thinner intermetallic layer.

In accordance with an additional aspect of the present invention, the coating liquid modifier can be carried out by soaking the parts in a liquid modifier, or by spraying or applying a liquid modifier on the detail brush (brush), and either the entire part, or selectively on her part that makes it possible to apply the coating not only on the open, visible surface, but also on the inner surface, such as a hollow inside vents for cooling or channel in the blade of a jet engine is. As a consequence, the modifier can be applied on the inner surface, which otherwise cannot be easily covered, which are therefore increases the capacity of the intermetallic layer, protecting these surfaces, and increases the service life of metal parts.

In accordance with another aspect of the present invention, the modifier can be used for easy and inexpensive to add additional functional material in the intermetallic layer and providing thereby formed in the "trickle down" multicomponent diffusion layer. Therefore, when the modifier is a silane compound, the intermetallic layer during its formation in the environment of deposition may best way to diffuse the silicon. Similarly, when the modifier is metallogenica Lewis acid, a metal ion in the Lewis acid may be selected for their beneficial properties of the intermetallic layer. For example, the Lewis acid is intended to include metal ions of chromium, platinum, and/or zirconium as an additional functional material in the intermetallic layer can be CrCl3, PtCl4, ZrCl4or ZrF4. When an item with modifier on it, which is the Lewis acid is exposed to the environment of deposition, it is assumed that the halogen (i.e. chlorine or fluorine) becomes part of the reaction gas, and the ions, for example, chromium, platinum, and/or zirconium to be released from the modifier and migrate in the intermetallic layer, such as aluminides layer formed on the metal parts, which formed as a result desirable chrome-aluminides, platinum aluminides and/or zirconium-aluminides layer with its advantageous properties. However, in this case the modifier in the form of a Lewis acid is applied more easily and therefore less expensive than platinum or chromium electrolytic plating, and at the same time he is also a much cheaper material than platinum or chromium, is used for applying electrolytic coating.

When the modifier is a Lewis acid metallogenesis type, in practice, some metal parts will be tested in the environment of deposition of the problems associated with the presence of grain boundaries at the surface. In accordance with an additional aspect of the present invention the advantage of the modifier in the form of a Lewis acid can be obtained without such problems associated with the presence of grain boundaries by applying a thin powder of the desired metal-donor located in the details of the Lewis acid, when it is still in the liquid state. the example on the surface of a liquid Lewis acid may be sprayed aluminum powder. When an item with modifier in the form of a Lewis acid and added the metal donor is in the environment of deposition, the problem associated with the presence of grain boundaries is reduced or minimized.

In accordance with another aspect of the present invention, the modifier may be selectively deposited on the details of aerospace engineering, and in particular on the details of the jet engine, among which you can specify blades, bandages and guide (allow) the device (from the English. blades, shrouds and vanes). Such items have parts that are subjected during engine operation the effect of the air stream of high pressure and which is desirable intermetallic layer and, possibly, multi-component intermetallic layer. At the same time, other areas such parts of aerospace engineering are not in the path of the air flow and therefore is not required when using the same level of protection. In some situations, increasing more than a thin intermetallic layer can be harmful, especially for areas such parts that come in contact with other parts of the engine and must therefore be mounted in a single whole with narrow tolerance limits. In such cases, the modifier may be selectively applied to these plots details, adapter the bathrooms to the air stream of high pressure, in order to ensure the possibility of increasing desirable Tolstoy and/or multicomponent intermetallic layer on such sites details. The remaining parts can be protected by traditional means, or they provide the possibility of increasing the intermetallic layer, which, however, will be thinner than the layer formed on plots with pre-coated, due to the absence of such pre-coating of the modifier.

On the basis of the above, we propose an improved deposition method, whereby on the metal parts is formed intermetallic layer. These and other objectives and advantages of the present invention will become apparent from the accompanying drawings and their description.

Brief description of drawings

The accompanying drawings are included in this description and its component part, illustrate embodiments of the invention and together with the General description given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

Figa is a schematic partial image of a cross section of a typical metal parts;

Figv shows a detail according figa with education who is important to her intermetallic layer through time T 1stay in the environment of deposition in accordance with the method of the prior art;

Figa shows a detail according figa coated with the surface modifier in accordance with the principles of the present invention;

Figv and 2C show the item according to Figo with the corresponding educated on it intermetallic layers at appropriate times T1and T2stay in the environment of deposition in accordance with the method of the present invention;

Fig.2D is a greatly enlarged view of the part according figa with reinforcing modifier metal powder designed to reduce problems with grain boundaries;

Figa shows a detail according figa with selectively deposited on its surface modifier;

Figv shows a detail according figa with educated on it intermetallic layer of variable thickness after a residence time in the environment of deposition in accordance with the method of the present invention;

Figure 4 is a schematic illustration showing details such as depicted in figa, figa and/or figa, in the environment of deposition of the conventional CVD furnace to explain the principles of the present invention;

Figure 5 is a perspective view of the parts in the form of the working blades Rea is efficient engine, showing liquid modifier is selectively deposited in accordance with the principles of the present invention;

6 is a vertical side view of the blade according to figure 5, shown in partial section along lines 6-6 after exposure to the environment of deposition;

Fig.7 is a perspective representation in partial section of the guide vane of a jet engine showing the selectively applied prior to the coating in accordance with the principles of the present invention; and

Fig is a representation of a partial section of the band jet engine showing the selectively applied prior to the coating in accordance with the principles of the present invention.

Detailed description of drawings

As follows from figa, it is shown in the context of a typical plot of metal 10. Item 10, as usual, consists of metal or metal alloys and has a surface 12 to be protected, for example, from corrosion and/or high-temperature oxidation. The surface 12 may be visible to the naked eye, or it may be hidden under other structures or parts details. Therefore, it is clear that item 10 on figa is only an example of any metal parts having one or more surfaces 12 to be protected.

To protect the poverhnosti 12 the following is generally accepted. First one or more parts 10 is cleaned to remove any oxide or other unwanted material (not shown) from the surface 12 of each part in order to expose her to bare metal on level 14 of the surface 12 (level 14 can define a plane, if the surface 12 is flat). Then the item(s) 10 is placed in the chamber 20 conventional CVD furnace 22, which is schematically shown in figure 4. CVD furnace 22 provides reduced (partial) pressure and intense heat in the chamber 20. The camera 20 may also be introduced activator 21, such as before ammonium, and metal-donor 24, and created a positive pressure of argon (not shown). When the part 10 is composed of supersplash Nickel-based, metal-donor 24 may be aluminium, which can be provided, for example, in the form of pieces or powders of chromium, aluminum, cobalt-aluminum or vanadium-aluminum. Reduced pressure and the high heat creates an environment 26 deposition, which releases aluminum from pieces 24 steam containing aluminum (arrows 28), so that the surface 12 is exposed to the metal-donor, which is aluminum. This energy results in the intermetallic layer 30 in the form of aluminide formed on the surface 12 of the workpiece 10, and the layer 30 is then to protect p the surface 12 (pigv).

Depending on the time (T1), during which the part 10 is exposed to the environment of deposition of the intermetallic layer 30 will normally be formed to a certain depth W1measured between its upper or outer end 32 and its lower or inner end 34. The layer 30 will normally include at least an additional portion 36 extending outward from level 14 or above level 14 original surface 12 to the outer end 32. Intermetallic layer 30 can also include a diffusion part 38 extending inward from level 14 and in item 10 to the inner end 34, which typically is below 14, but may coincide with, if the diffusion part is not formed. Thus, a large part of the layer 30, if not the entire layer, is an additional part 36, but this is not necessary or important, because the dynamics behavior of the involved materials and the conditions of the process will dictate the level of the relevant portions of layer 30. An additional part 36 will normally have a high concentration of the metal-donor 24, such as aluminum, and may include due to external diffusion of metal from the workpiece 10 some metal from the part 10, that the CSOs as Nickel, if item 10 is, for example, from supersplash Nickel-based. Conversely, the diffusion part 38 will have a lower concentration of the metal-donor 24 and a high concentration of metal from the workpiece 10.

It is desirable to form such intermetallic layer, which either would be significantly thicker W1during the same time (T1the impact of environment 26 deposition, or essentially had the same thickness W1but would require significantly less time (T2<T1the impact of environment 26 deposition, both options should be implemented without significant changes in other process variables used to create the environment 26 deposition. To this end and in accordance with the principles of the present invention it has been found that such results are possible in the case of applying a preliminary coating of modifier 50 to the surface 12 (figa) before placing items 10 on Wednesday 26 deposition. Modifier 50 is mainly applied in the form of readily available liquid and then dried to education pre-coating. After that, item 10, pre-coated with modifier, place on Wednesday 26 deposition (figure 4).

As follows from FIGU, after finding the 10 items in the environment 26 deposition within a predetermined time T1and at essentially the same process variables, the and the surface 12 can be formed intermetallic layer 60, but to the thickness W2that in any case, 20-80%, and usually at 40% greater than the thickness W1. Layer 60 includes an additional portion 66, which extends to the outermost end 62, which is further from level 14, the outer end 32 of the additional part 36 (pigv). The diffusion part 68 can also be found in item 10 in more, less, or no to the same extent as the portion 38, depending, for example, from the modifier 50. However, as a result, when the environment 26 deposition during essentially the same period of time T1grows thicker intermetallic layer 60 (W2>W1) pre-coated with modifier 50, which was impossible without a modifier.

Alternatively, when it is desirable to increase the metal layer 70 (figs), having a thickness of W3that is essentially equal to the thickness of W1layer 30, in accordance with the principles of the present invention, the time cycle CVD furnace 22 may be substantially reduced to the time T2, which is substantially (at least 20%less time T1necessary for formation of layer 30 above, while no significant changes applicable process variables. To this end, the item 10, pre-coated with modifier 50, place on Wednesday 26 deposition figure 4) and is exposed to the environment 26 deposition during the time T 2(<T1). It was found that after removal of the CVD furnace 22 intermetallic layer 70 formed on the surface 12 is essentially similar to the thickness of the layer 30 (W3≈W1). However, the additional portion 76 of the layer 70 may be actually additional thicker portion 36 of the layer 30, whereas the diffusion portion 78 of the layer 70 may be thinner diffusion part 38 of the layer 30 due to the dynamics of the deposition process and the time during which the item 10 were among the 26 deposition.

In accordance with an additional aspect of the present invention and as figa, item 10 may be selectively covered with modifier 50, for example, prior to applying it only to a selected area 12A of the surface 12, leaving the area(s) 12b without prior coverage. After drying modifier 50 on the section 12A item 10 with modifier 50 on the section 12A can be placed on Wednesday 26 deposition described above (figure 4), for the formation of the intermetallic coating 100. However, from FIGU, intermetallic coating 100 may also have two different segment 110 and 120 different thickness. The segment 110, lying on top not previously covered areas 12b of the surface 12, will be the first small thickness Waand segment 120, lying on top of section 12A of the surface 12 (which is was pre-coated with modifier 50), will have a significant higher or deeper thickness Wb(that is, Wb>Wand), mainly in the advanced portion 126 segment 120 in comparison with additional part 116 of the segment 110. The corresponding diffusion pieces 124 and 114 may be of essentially equal thickness, although the areas previously covered surface 12A of the diffusion component 124 may be thinner or may not exist, depending on the nature of the preliminary coating 50. As a result, the intermetallic layers can be deposited on selected areas of detail, while other parts of the surface can be increased relatively thin intermetallic layers (or strata may not be, if the site is protected; not shown).IN accordance with another aspect of the present invention modifier 50 may be applied in liquid form and then dried to form a coating 50. One liquid form of the modifier can be celanova material. The silane suitable for use in the present invention may include mono-, bis - or trifunctionally tralkoxydim. The silane may be bifunctional trialkilsilil, preferably trimetoksi or triethoxysilyl group. Can also be used aminosilane, but disilane may not be suitable vsledstvii the sulphur content. Bifunctional silane compounds are well known, and two preferred of these compounds used in this invention are bis(triethoxysilyl)ethane and bis(trimethoxysilyl)methane. In both of these connections bridging group between the two wilanowie fragments represents an alkyl group.

Additional commercially available silanes include:

1,2-Bis(tetramethyldisiloxane)ethane

1,9-Bis(triethoxysilyl)nonan

Bis(triethoxysilyl)octane

Bis(trimethoxysilyl)ethane

1,3-Bis(trimethylsiloxy)-1,3-dimethylsiloxane

Bis(trimethylsiloxy)atysian

Bis(trimethylsiloxy)methylsilane

AL 501 from AG Chemetall, Frankfurt, Germany

The silane may be applied in pure form, in aqueous solution or in solution in a water/alcohol solvent. The solvent solution will contain from about 1 to 2 vol.% up to about 30% vol. deionized water, while the other is a lower alcohol, such as methanol, ethanol, propanol or the like. The preferred ethanol and methanol. The solvent is combined with the silane and usually with acetic acid to obtain a pH of about 4-6. The concentration of the silane compound is unimportant as long while during the deposition of the silane remains in solution. Typically, the solution will contain from about 1% to about 20% silane (to ncentrate can be expressed in this range or%vol., either in wt.%).

One silane solution 50 may be a functional organosilane, such as BTSE, that is, 1,2-bis(triethoxysilyl)ethane or BTSM, that is, 1,2-bis(trimethoxysilyl)methane. To obtain a silane solution 50 silane can be dissolved in a mixture of water and acetic acid at pH 4, then in denatured alcohol. The solution contains about 10 ml of distilled deionized water RO, 190 ml of denatured alcohol (a mixture of ethanol and isopropanol, N.O.S.) and glacial acetic acid 10 ml BTSE received from Aldridge Chemical. The concentration of silane is between about 1 vol.% and 10% vol. and preferably about 5 vol.%. The result is easily a more or less solid pre-coating 50 at easily achievable temperatures.

Silane solution 50 is applied liberally, and any excess solution is drained during application, or applied with a brush (figure 5) as well as apply paint. Part 10 with modifier 50 in the form of a silane solution, allow to dry and then heated, for example, using an inkjet drying apparatus (not shown) or even in a conventional oven (not shown) to a temperature of about 250°F (121° (C) during the time from about 15 to 25 minutes with the formation of a solid pre coating 50. Before heating the solution can first be given the opportunity to dry out, for example, what omashu located at the bottom of the lamp (not shown). Heating of the solution is to form a preliminary coating 50 can be accomplished by heating the workpiece 10 with celanova solution. Usually formed by coating 50 will have a specific surface area of from 0.01 to 2.0 g/cm2. Can be applied to many such coatings 50, and each coating before applying the next coating is dried and heated. In one example, is implemented by three application 10%BTSE by "staining" manually sandblasted section 12A of the surface of one or more parts 10 and intermediate cycles of heating at 250°F (121° (C) within 15 minutes. A selective manner previously covered in part 10 (with three application silane modifier) place on Wednesday 26 deposition for the training course, consisting of 4 1/2 hours of soaking in the 1960°F (1071° (C) using byflorida ammonium as an activator (not shown) and 24 pieces of Cr-Al to form intermetallic(s) layer(s) 100 (layer layer 110 and 120). After this item 10 is removed from the environment of deposition and washed with Dial soap and hot water to remove any soluble fluoride deposits. In the intermetallic layers 120 (pigv), section 12A in many cases much deeper or thicker than the intermetallic layer 110 on the sections 12b of each part 10. For this example the one side is a surface 12A, and the opposite side is a surface 12b.

Alternative pre-coating 50 may be a colloidal silica (silica, such as LUDOX®-AS the company E.I. du Pont de Nemours, available as a 30 wt.% solution of silica in water from Aldrich Chemical as solution number 42083-2. This solution was poured onto the surface 12 of the workpiece 10 and dried inkjet drying apparatus (not shown), and then place on Wednesday 26 deposition for the formation of the intermetallic layer 60, 70 or 100.

A solution of silane or solution of colloidal silica is applied directly to clean the surface of the part 10 and then heated for the formation of a solid coating 50. Covered by item 10 is then exposed to the environment 26 deposition for the formation of, for example, the desired intermetallic layer 60, 70 or 100. The advantage Milanovich modifiers or colloidal silicon modifiers is that the silicon material has a tendency to migrate or to dispergirujutsja in the intermetallic layer 60, 70 or 120 (and possibly in parts of the layer 110 adjacent to the layer 120, where the item was not in a selective manner previously covered), thus providing a multi-component layer containing not only the metal-donor 24 and the metal(s) from part 10, but also functional material, which is shown by the position 130 nafig, 2C and 3B, which in this case is silicon. When the part 10 is made of supersplash Nickel-based and metal-donor 24 is an aluminum intermetallic layer can be aluminium silicon and Nickel, thus providing the required additional advantage of silicon in the protective layer. It is beneficial to have additional layer 36, 66, 122 were at least 2 wt.% of silicon.

Modifier 50 may alternatively be composed of metallogenesis Lewis acid, which is when applied in powder or liquid form (and applied in pure unmixed form, if it is a liquid), then carry out the drying and heating in a manner similar to that which was applied when used as a modifier of the silane. These Lewis acid characterized by the fact that they contain a halogen and a metal ion, which is mostly beneficial for the intermetallic layer 60, 70 or 120, with examples of these acids include CrCl3, FeCl3, PtCl4, ZrCl4, ZrF4, PhCl3, IrCl3, RuCl3, CoCl4TiCl4. If the Lewis acid is selected so that it is a Lewis acid-based or Cr, or platinum-based (e.g., CrCl3or PtCl4), then the metal ion or ion chromium, or platinum ion. In such cases, if the pre modifier which is a Lewis acid, that is, it is pre-printed on all or part of the surface 12, then after drying, acid Lewis item 10 with the pre-coating 50 of the Lewis acid is placed in a medium 26 deposition (figure 4). It is assumed that the halogen Lewis acid becomes part of the reaction gas in the environment 26 deposition, and that the metal ions of the Lewis acid will migrate or dispergirujutsja in the intermetallic layer 60, 70, 100 or 120, and become part of it (and possibly peripheries layer 110 adjacent to the layer 120), again as shown by the position 130. As a result, depending on the selected Lewis acid, is formed aluminide platinum and Nickel or aluminide chromium and Nickel. Similarly, if the Lewis acid is acid based on iron or zirconium, then 130 are respectively iron or zirconium, which will give aluminide iron and Nickel or aluminide zirconium and Nickel.

To avoid problems associated with the presence of grain boundaries on the surface 12 through the modifier 50 in the form of a Lewis acid with a Lewis acid can be introduced metal powder 135 (fig.2D). The Lewis acid 50 mostly first applied in liquid form to the surface 12 and then before drying modifier 50 on it put a metal powder 135 in the form of fine-grained coatings. Metal powder 135 wish is Ino is a pure form of the metal-donor 24. When the metal-donor represents aluminum, powder 135 may be a powder particle size of -325 mesh, sprayed on the modifier 50, for example, using an aspirator for baby spout (not shown) or the like. It is assumed that the presence of metal powder 135 avoids the problems associated with the presence of grain boundaries on the surface 12 during impact on its environment 26 deposition.

Various parts (elements) of the aircraft jet engine can be pre-coated with modifier 50 (includes metal powder, if it is necessary) with the formation of the desired(s) intermetallic(s) layer(s) 60, 70, or 100 in accordance with the principles of the present invention that will be described now with reference to figure 5-8. For example, the item 10A representing the working blade of a jet engine (figure 5 and 6)includes a profiled segment 140, calculated on presence in a hot air stream of high pressure (as shown by arrows 142). Profiled segment 140 includes a streamlined air flow upper and lower surfaces 144 and 146 extending from the end edge 148 and the connecting curved profiled edge 150 (which includes curved sections 144A and 146a surfaces 144 and 146, respectively). Profiled segment is UNT 140 and the surface 144, 146 connected in a single unit with the base (root) 152 used to attach the blades 10A to disk (not shown) of the turbine jet engine (not shown). Existing on the surfaces 144 and 146 vents for cooling the surface of the associated internal part of the segment 140 through channels or passageways 156 (6) with boundary holes 158 cooling, formed along the edge 148 to ensure the passage of cooling air into the segment 140 during use of the blade 10A.

In accordance with the principles of the present invention, it is desirable to protect at least streamlined air flow surface 144 and 146, and possibly the upper surface 160 of the base 152, as they may be exposed to hot air flow high pressure, shown by the position 142 (figure 5). Accordingly, the modifier 50 may be applied to surfaces 144, 146 and 160, for example, by manually applying a brush (figure 5), with modifier 50 is applied in liquid form and then dried as described above. Alternatively, the blade 10A can be inverted and immersed in a bath (not shown) with modifier 50 in the liquid state, or it may be napalan modifier 50 in a liquid state before drying and heating. If modifier 50 is metallogeny a Lewis acid, at her before drying and heating can b the th sprayed powder 135. After this pre-coated blade 10A (which at first mainly dried and heated) can be placed on Wednesday 26 deposition (figure 4), after which the surfaces 144, 146 and 160(ut) was founded(s) intermetallic(s) layer(s) 60, 70 or 100 thickness (thick layer 120 100 shown in Fig. 6). The remaining parts of the base 152 that are in contact with other parts of the turbine disk (not shown), or protect mainly so that they are not formed intermetallic layer, or provide education on them a thin intermetallic layer (for example, layer 110), which can be removed by traditional means, prior to placing the blades 10A in a turbine disk (not shown) for deployment engine (not shown).

Optionally and preferably may be protected by internal channels 156 (6) blades 10A. Although previous attempts aimed at ensuring the intermetallic layer on the surface of the inner channel 156, had little success due partly to limited access to the environment of deposition, using the present invention, the modifying coating 50 may be provided on the inner surfaces of the channel 156, for example, by immersing the shaped segment 140 in the tub (not shown) is in a liquid state modifier 50. In this case the liquid modifier migrates through the openings 154 and 158 of the cooling channels 156 with a preliminary coating on the surfaces of the channels 156 and on the surfaces of the holes 154 and 158. After that, the blade 10A may be dried, for example in a furnace at the required temperature, which will cause the formation of pre coating 50 of the modifier on the surfaces 144, 146, on the surfaces of the holes 154, 158 cooling and on the surfaces of the channels 156. Then place pre-coated blades 10A Wednesday 26 deposition will cause the capacity of the intermediate(s) layer(s) not only on the surfaces 144 and 146, but also can promote the formation of the intermetallic layer of a certain thickness on the surfaces of the channels 156 and/or holes 154, 158 cooling, resulting in these areas are also protected.

7 shows the detail 10b constituting the guide (allow) the device is a turbine jet engine. A guiding apparatus 10b includes inner and outer curved strips 200, 202, which may be segments (sectors) of the ring or may be continuous (first shown in Fig.7). Between the strips 200 and 202 are placed at intervals of a number of vanes 204, and in a typical guide segment 10b 7 shows three blades 204. Each guide blade 204 has a corresponding profiled in the form of a wing configuration that is formed between the front edge 206 and the trailing edge 208. Each vane 204 forms, thus, guides the poverhnosti 210 and 212 between the front and rear edges 206 and 208, which when used, must be protected. To this end, the modifier 50 (and, if necessary, the powder 135) can be applied on the surfaces 210 and 212, as well as on open directed inside flat surface 214 and 218 of the outer strips 200 and 202, which in the environment 26 deposition is formed(are) intermetallic(s) layer(s) 60, 70 or 100. In addition, vanes 204 may also have an internal cavity 220, communicating through holes 222 cooling in the front and rear edges 206 and 208, respectively (shown only holes 222 in the front edge 206). The internal cavity 220 may have a surface coated with modifier 50 by immersing the parts 10b, which is the guiding segment, modifier, which is in liquid form, and subsequent drying in an oven prior to exposure to the item 10b environment 26 deposition (figure 4). In the environment of deposition on pre-coated surfaces will form intermetallic layers 60, 70 and/or 120.

And finally, on Fig shows the item 10C, representing bandage jet engine, which has an upper surface 300 chamber connected with the inner cavity 302 through the holes 304 of the cooling surface 300 and the opening 306 in the front edge 308. Surface 300 should be protected, for example, by applying a modifier 50 (and, if necessary, powder 135) for arr is increased on the surface 300 in the environment 26 deposition of the intermetallic layer in accordance with the principles of the present invention. In addition, the brace 10C may be immersed in the liquid modifier for education on the surfaces of the internal cavity 302 preliminary coating 50, as well as to promote the formation of protective intermetallic layer 60, 70 or 100.

When using modifier 50 is applied in the form of a preliminary coating on the surface 12 or section 12A of the surface of the metal part 10. When the metal part 10 is selected from components (elements) of the aircraft jet engine, such as blade 10A, the guide segment 10b or bandage 10C, on one or more surfaces, streamlined air flow, and/or on the surface and the internal cavity of the applied modifier 50. If necessary, the modifier 50 may also be introduced metal powder 135, or powder that can be applied to the modifier 50. Pre-covered in item 10 is placed then on Wednesday 26 deposition on the desired period of time, and pre-covered surfaces form an intermetallic layer 60, 70 or 120, and, in addition, vulnerable and previously uncovered areas 12b metal parts 10 form an intermetallic layer 110 of a lesser thickness. When the modifier 50 is a silane or a colloidal silicon oxide, intermetallic layer 60, 70 or 120 may obrazovyvalis the silicon 130. Similarly, if modifier 50 is metallogeny the Lewis acid is present in her metal ion may represent, for example, platinum, chromium or zirconium, with the intermetallic layer 60, 70 or 120 will be formed of platinum, chromium or zirconium, 130.

Thus, in the preceding description, we propose an improved deposition method to form the intermetallic layer on the metal parts.

Although the present invention is illustrated by the description of embodiments and while these embodiments of described in detail, the applicant has no intention to narrow or in any way to limit the scope of the attached claims submitted by the parts. For specialists in this field of technology are obvious additional advantages and modifications of the present invention. So, for example, on Wednesday 26 deposition to ensure a shiny parts can be put pieces of yttrium (not shown), particularly when the modifier 50 is colloidal silica. In addition, although in view of the method of the present invention showing some of the details or items of a jet engine, the present invention can be best used in other aerospace engineering and, of course, for any other metal the detail. Moreover, although the present invention has been explained with reference to Wednesday 26 conventional deposition CVD furnace, it is clear that the invention is equally applicable to the environment of deposition, created in any CVD furnace, including the dynamic processes of CVD, in which the surface is exposed to metal-donor in the form of gas transferred to the environment of deposition, either in vacuum or under reduced pressure, and/or in the process of plating after or during grouting in hard environment (from the English. above-the-pack or in-the-pack coating). Thus, the expression "the environment of deposition" should be understood as an expression relating to any of the above environment, not only to the environment, created in conventional CVD furnace. Therefore, the invention in its broader aspects is not limited to specific details of a typical apparatus and method shown and described by example. Accordingly, without deviating from the essence or scope of the General inventive concept defined by the following claims, may be made for certain modifications.

1. The deposition method, including the location of the metal part (10) in the environment of deposition (26), in which the impact of donor material (24) on at least one selected area (12A) of the workpiece surface (10) over time (T)required for the formation of at least periodnum selected section (12A) of the surface of the intermetallic layer, containing the metal obtained from the donor material (24), characterized in that before placing the metal in the environment of deposition on said at least one selected area (12A) of the surface of the part (10) is applied modifier (50), providing education on at least one selected modified section (12A) of the workpiece surface (10) of the intermetallic layer (60, or 70, or 120), having a greater thickness than the thickness of the intermetallic layer, which was formed on the above-mentioned at least one selected section (12A) of the surface, subjected to a donor material (24) in (26) deposition over time (T), without pre-applied thereto modifier (50).

2. The method according to claim 1, characterized in that as a modifier (50) put the liquid silane and after application are drying to the formation of the solid prior coverage.

3. The method according to claim 1, characterized in that as a modifier (50) put metallogeny the Lewis acid.

4. The deposition method according to claim 3, characterized in that the Lewis acid (50) is applied in liquid form and once in the application are drying to the formation of the solid prior coverage.

5. The method according to claim 3, characterized in that the Lewis acid (50) introducing a metal powder (135).

6. The method according to claim 3, characterized those who, that put a Lewis acid (50)containing a metal ion (130)required for the implementation of the intermetallic layer (60, or 70, or 120)formed on a metal part (10).

7. The method according to claim 6, characterized in that the cause of the Lewis acid (50)containing a platinum ion.

8. The method according to claim 6, characterized in that the cause of the Lewis acid (50)containing chromium ion.

9. The method according to claim 6, characterized in that the cause of the Lewis acid (50)containing zirconium ion.

10. The method according to claim 1, characterized in that as a modifier (50) is applied colloidal silica.

11. The method according to claim 1, characterized in that the metal part (10) has a total surface (12), includes a section (12A) of the surface, when this modifier is applied on the entire common surface (12).

12. The method according to claim 1, characterized in that the metal part (10) has a total surface (12), includes a section (12A) of the surface, when this modifier is applied to a selected area (12A) of the total surface.

13. The method according to claim 1, characterized in that the modifier (50) is applied in several layers.

14. The method according to claim 1, characterized in that the metal part (10) use the item selected from the group 10A, 10b, 10C.

15. The method according to claim 1, characterized in that use the metal part (10)made of supersplash Nickel-based.

16. The method according to claim 1, Otley is audica fact, they use the metal part (10)made of supersplash cobalt-based.

17. The deposition method, including the location of the metal part (10) on Wednesday (26) deposition and impact of donor material (24) on at least one selected area (12A) of the workpiece surface (10) over time (T)required for the formation of the above mentioned at least one selected section (12A) of the workpiece surface (10) of the intermetallic layer containing a metal from the donor material (24), characterized in that before placing the metal in the environment of deposition on said at least one selected area (12A) the surface of the workpiece (10) is applied modifier (50)selected from the group consisting of metallogenesis Lewis acid, silane material and colloidal silicon dioxide.

18. The method according to 17, characterized in that when using liquid silane after application are drying to the formation of the solid prior coverage.

19. The method according to 17, characterized in that when using a Lewis acid in liquid form, once in the application are drying to the formation of the solid prior coverage.

20. The method according to 17, characterized in that the Lewis acid is injected metal powder (135).

21. The method according to claim 19, wherein causing the Lewis acid, containing the Yu metal ion (130), required for implementation of the intermetallic layer (60, or 70, or 120)formed on a metal part (10).

22. The method according to item 21, wherein causing the Lewis acid containing a platinum ion.

23. The method according to item 21, wherein causing the Lewis acid containing chromium ion.

24. The method according to item 21, wherein causing the Lewis acid containing zirconium ion.

25. The method according to 17, characterized in that the metal part (10) has a total surface (12), includes a section (12A) of the surface, while the modifier (50) is applied on the entire common surface (12).

26. The method according to 17, characterized in that the metal part (10) has a total surface (12), includes a section (12A) of the surface, while the modifier (50) is applied to a selected area (12A) of the total surface.

27. The method according to 17, characterized in that the modifier (50) is applied in several layers.

28. The method according to 17, characterized in that the metal part (10) use the item selected from the group 10A, 10b, 10C.

29. The method according to 17, characterized in that use the metal part (10)made of supersplash Nickel-based.

30. The method according to 17, characterized in that use the metal part (10)made of supersplash cobalt-based.

31. The method of deposition on the metal part of the reagent is on the engine, includes the location of the metal part (10) on Wednesday (26) deposition and impact of donor material (24) on at least one selected area (12A) of the workpiece surface (10) over time (T)required for the formation of the above mentioned at least one selected section (12A) of the workpiece surface (10) of the intermetallic layer (60, or 70, or 120)that contains a metal from the donor material (24), characterized in that as the jet engine used part (10A), or (10b)or (10C), as referred to at least one selected area (12A) surface using at least one of the metal surfaces(144, 146, 154, 156, 158, 160) part (10A), or at least one of the metal surfaces(210, 212, 214, 218, 220, 222) part (10b), or at least one of the metal surfaces (300, 302, 304, 306) of the part (10C), which prior to the formation intermetallic layer (60, or 70, or 120) is applied modifier (50), providing education in the mentioned at least one selected modified section (12A) of the workpiece surface (10) of the intermetallic layer (60, or 70, or 120), having a greater thickness than the thickness of the intermetallic layer, which was formed on the above-mentioned at least one selected section (12A) of the surface subjected to the donor material is (24) in (26) deposition over time (T), without pre-applied thereto modifier (50).

32. The method according to p, characterized in that as a modifier (50) use a modifier containing the desired metal ion (130), which is a functional material for introduction into the specified intermetallic layer (60, or 70, or 120) and the formation of multicomponent intermetallic layer (60, or 70, or 120) on said at least one selected area (12A) surface with simultaneous diffusionism the desired metal ion (130) of the modifier (50) in the intermetallic layer (60, or 70, or 120).

33. The method according to p, characterized in that the functional material using a material selected from the group consisting of platinum, chromium, silicon and zirconium.

34. The method according to any of PP-33, characterized in that as a modifier (50) is applied silane material.

35. The method according to any of PP-33, characterized in that as a modifier (50) use of colloidal silica.

36. The method according to any of PP-33, characterized in that as a modifier (50) put metallogeny the Lewis acid.

37. The method according to p, characterized in that the Lewis acid is injected metal powder (135).

38. The method of deposition on the metal part of the jet engine, which includes the location of the metal part (10) in the food (26) deposition and impact of donor material (24) on at least one selected area (12A) of the workpiece surface (10) over time (T), sufficient for the formation on said at least one selected section (12A) of the workpiece surface (10) of the intermetallic layer (60, or 70, or 120)that contains a metal from the donor material (24), characterized in that as the jet engine used part (10A)or (10b)or (10C), as referred to at least one selected area (12A) surface using at least one of the metal surfaces(144, 146, 154, 158, 160) parts (10A), or at least one of the metal surfaces(210, 212, 214, 218, 220, 222) part (10b), or at least one of the metal surfaces (300, 302, 304, 306) of the part (10C), which before the formation of the intermetallic layer (60, or 70, or 120) is applied modifier (50)selected from the group consisting of metallogenesis Lewis acid, silane material and colloidal silicon dioxide.

39. The method according to 38, characterized in that as a modifier (50) use a modifier containing the desired metal ion (130), which is a functional material for introduction into the specified intermetallic layer (60, or 70, or 120) and the formation of multicomponent intermetallic layer (60, or 70, or 120) on said at least one selected area (12A) surface with simultaneous diffusionism the desired metal ion (130) from modificato is a (50) in the intermetallic layer (60, or 70, or 120).

40. The method according to 39, characterized in that the functional material using a material selected from the group consisting of platinum, chromium, silicon and zirconium.

41. The method according to 38, characterized in that metallogeny the Lewis acid is injected metal powder (135).



 

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