The method of coating
(57) Abstract:The invention relates to methods gasometrical coating on parts made of aluminum alloys. The objective of the invention is to improve the quality of the sprayed coatings by increasing the strength of adhesion of the coating to the substrate. The method involves the following operations: mechanical surface preparation, epidemiologie, heating the parts up to 60 - 450oC and the coating. table 1. The invention relates to methods of thermal coating on parts made of aluminum alloys.The known method of coating metals, which consists in gasometrical the coated substrate preheated surface of the substrate and subsequent deposition of the base layer (1). Preheating of the substrate leads to a reduction of thermal stress in the coating caused by the difference in the coefficients of thermal expansion of the coating and the substrate. This increases the adhesion strength. However, for a number of cases, this adhesion does not provide the required performance characteristics of the components with coatings. In addition, with increasing temperature above a certain level is The closest way to the invention is a method including pre-machined surface with ultrasonic impact and a coating (2). The disadvantage of the prototype method is that to increase the adhesion strength of the coating to the base to almost simultaneous operations preliminary machining with ultrasonic impact and coating as described interval is 0.5 seconds. When increasing the interval again begins to grow the oxide film is destroyed under the influence of ultrasonic vibrations. As a result, the adhesion strength may fall even below the level provided by the method-analogue of (1) for some modes.While performing machining and coating of the sprayed particles by radiation will heat the tool for machining and sticking to it, which will cause it to heat and change the geometry. This will cause a change in the parameters of ultrasonic treatment and the loss of precision machining that will reduce the strength of adhesion.The objective of the invention is to improve the quality of the sprayed coatings of testing the method of coating, including preliminary mechanical surface treatment and coating, after preliminary machining surface carry out its epidemiologie and before coating produce heating of the parts that are exposed to spraying, to a temperature 60.450 degrees Celsius.Unlike the prototype, the mechanical surface preparation and coating are performed sequentially, with the inclusion of intermediate operations epidemiologia that simplifies the process of preliminary preparation of the surface due to the appearance of the specified interval. During the time between machining and epidemiologies will go undesirable process of growing the oxide film on the surface due to the high affinity of aluminum for oxygen, which causes a decrease in the adhesion strength of the coating to the base. To compensate for this, the proposed method introduces an additional, in comparison with the prototype, the operation pre-heating increases the strength of the coupling by reducing thermal stress in the coating. Note also that Eelam is a solution parfocality acid. With increasing temperature improves smuul its mechanical destruction. In addition, the flux increases the activity of the fluoride film, which also contributes to the destruction of aluminum oxide. These factors also lead to an increase in the adhesion strength.As the upper limit of the heating you can choose to 450 degrees Celsius - the temperature of decomposition of epilame. When this limit heating for each class of alloys must be individually selected. So, for example, aluminum wrought alloys are suitable as the upper limit of heating to use the softening temperature of aluminum alloys, caused by the aging process before the formation of stable phases. Usually thermal alloys wrought aluminium alloys begins at temperatures of components of 0.24.0.3 of the melting temperature, that is, 160.200 degrees Celsius, depending on the content of alloying elements. We also note that overheating higher temperature aging alloyed aluminium alloys leads to a fall in the resistance against intergranular corrosion associated with precipitation at the grain boundaries insoluble dispersed particles of the second phase, formed during the decomposition of solid solution. For casting aluminum alloys, it is advisable to heat det the s), which leads to warping and swelling of the castings. For the lower limit adopted on the basis of experimental data (see specific example), the heating temperature of 60 degrees Celsius, which begins a noticeable increase in the strength of adhesion of the coating to the core in comparison with the prototype.After machining to epidemiologia inevitable that there be some time interval, if these operations are not combined. This interval is necessary, on the one hand, to reduce to a minimum to avoid excessive growth of the oxide film. On the other hand, this interval should be enough technologically to perform the operation of epidemiologia. The tests showed that when the interval to 15 seconds between machining operations and epidemiologia for aluminum alloy V containing 1.6% of magnesium, a positive effect of the proposed method does not disappear. Deposition of large parts of the alloy V, such as disks with a diameter of 670 mm, showed that the interval in 5.10 seconds are enough for the preparation and operation of epidemiologia of the proposed method.Depending on the content of alloying elements the growth rate of the oxide film can both increase and reduce, the REE content in the aluminum alloy to 0.7% magnesium oxidation is increased 9.5 times, and the introduction of 0.7% beryllium in aluminum alloy with 10% magnesium reduces the oxidation of the alloy in 160 times. Experience shows that the choice of the time interval between the machining and epidemiologies, which is the oxidation of the surface without protective film epilame, and when the protective effect of epidemiologia is technologically determined for a particular alloy, the criterion of "reduced strength".An example of a specific implementation.The proposed method of coating were tested on prismatic samples of size HH mm, made of aluminum alloy V. The coating was applied by the proposed method on the prototype method and by the method similar. For samples deposited sublayer with a thickness of 0.1.0.15 mm nichrome HN, wire of 1.6 mm diameter, method of electric arc metallization on the following modes: a current of 200 A, voltage 32B. Then nubilalis main floor 2 mm thick steel HF, wire diameter 1.8 mm, for the following modes: a current of 200 A, voltage 32 b In the coating by the method similar mechanical preparation was performed using the abrasive tape. Before IPO interval between mechanical preparation and coating was 15 seconds. In the coating process of the proposed method after the mechanical preparation using abrasive belt surface 15 seconds were covered with a solution of epilame BSFC-180-05 dipping. Before deposition the samples the proposed method was heated to temperatures of 60, 100, 200 degrees Celsius. After coating was determined by the strength of adhesion "to cut" in a special fixture. Each value was determined according to the test results of 7 samples. The obtained data are given in the table.Analysis of the data shows an increase in the strength of the proposed method in comparison with the prototype in 2.4 times. The table shows that when heated to 200 degrees Celsius by the method similar starts to decrease the adhesion strength associated with excessive growth of the oxide film. When heated to this temperature on the proposed method of reducing the adhesion strength does not occur, indicating the reliability of the protective film from epolamine in the claimed temperature range.The use of the proposed technical solution during the deposition of thermal spray coating provides increased adhesion in comparison with the existing methods for aluminum is termicheskimi coatings. The method of application of thermal spray coatings on parts made of aluminum alloys, including mechanical surface preparation and coating, characterized in that after mechanical surface preparation spend her epidemiologie and before coating the workpiece is heated to 60 - 450oC.
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
FIELD: engines and pumps.
SUBSTANCE: invention is related to turbine blade with coating for deterrence of Ni-based superalloy reactivity. Specified coating is made by application of material for reactivity deterrence on Ni-based superalloy surface prior to application of diffusion aluminium coating. Material for reactivity deterrence represents pure Ru, alloy Co-Ru, alloy Cr-Ru or solid solution, the main component of which is Ru, at that creation of secondary reaction zones is deterred. Turbine blades are produced with higher resistance to Ni-based superalloy oxidation by deterrence of secondary reaction zones creation.
EFFECT: higher resistance to Ni-based superalloy oxidation.
7 cl, 4 tbl, 13 dwg, 2 ex
SUBSTANCE: invention refers to method of applIication coating for inhibition of reactivity of super-alloy on nickel base. A material inhibiting reactivity is applied on the surface of super-alloy on Ni base prior to application of diffusive aluminium coating. The material inhibiting reactivity corresponds to pure Ru, alloy of Co-Ru, alloy of Cr-Ru or solid solution, the basic component of which is Ru, also formation of the secondary zones is retarded.
EFFECT: production of coating for inhibition of reactivity of super-alloy on nickel base at retarding formation of the secondary reaction zone.
7 cl, 19 dwg, 4 tbl
SUBSTANCE: invention relates to metallurgy, in particular to methods of the chemical heat treatment of metals and alloys, and can be used in mechanical engineering for surface hardening of parts of machines, including the parts used in friction pairs, and also in cutting tools and die tooling. The method of the chemical heat treatment of a part from alloyed steel includes the placement of the part into the working chamber, activation of the part surface before chemical heat treatment, supply into the chamber of a working saturating medium, heating of the part to the temperature of chemical heat treatment and conditioning at this temperature until the formation of the required thickness of the diffusive layer. Activation of part surface before chemical heat treatment is performed by means of ion-implanted processing of the surface of the part at the energy of ions from 25 to 30 keV, radiation dose from 1.6·1017 cm-2 to 2·1017 cm-2, radiation dose set speeds from 0.7·1015 s-1 up to 1·1015 s-1 and when using as implanted ions of the following elements: C, N or their combinations. In special cases of the invention implementation the chemical heat treatment of the part is performed by a ion-plasma method. The ion-plasma method is the ion-plasma nitriding, either ion-plasma cementation, or ion-plasma nitrocementation.
EFFECT: increase of productivity and improvement of the quality of the process of chemical heat treatment, and also increase of the wear resistance of the parts after it.
3 cl, 1 ex
SUBSTANCE: invention relates to metallurgy, particularly to methods for chemical-thermal treatment of parts made from titanium, and can be used in mechanical engineering for surface strengthening of parts of machines, including parts operating in friction pairs. Method for chemical heat treatment of parts made from titanium involves placing a part in a working chamber, activation of surface of part before chemical-thermal treatment, feeding into chamber a working saturating medium, heating part to temperature of chemical-thermal treatment and holding at said temperatures to form required thickness of diffusion layer. Activation of surface of part before chemical-thermal treatment is carried out by means of ion-implantation treatment of surface of part at ion energy from 30 to 40 keV, dose from 1.4·1017 cm-2 to 1.8·1017 cm-2, at a dose accumulation rate of 0.7·1015 s-1 up to 1·1015 s-1 and implanted ions used are ions of C, N or their combination. In particular embodiments of invention, chemical-thermal treatment of parts is performed by ion-plasma nitriding, or ion-plasma cementation, or ion-plasma nitro-carbonisation.
EFFECT: higher efficiency and quality of chemical heat treatment, higher wear resistance of parts after chemical-thermal treatment.
SUBSTANCE: invention relates to metallurgy, particularly to methods of chemical and heat treatment of parts from titanium-based alloy, and can be used in mechanical engineering for machines parts surface strengthening, including parts, operating in friction pairs. Method for chemical heat treatment of parts made from titanium-based alloy comprises placing part in working chamber, activation of surface of part before chemical heat treatment, feed a working saturating medium into chamber, heating to temperature of chemical heat treatment and holding at said temperatures to form required thickness of diffusion layer. Activation of surface of part before chemical heat treatment is carried out by means of ion-implantation treatment of surface of part at ion power from 30 to 40 Kev, with dose from 1.4⋅1017 cm-2 to 1.8⋅1017 cm-2, at dose build-up rate of 0.7⋅1015 s-1 up to 1⋅1015 s-1, wherein implanted ions are ions of following elements: C, N, or combinations thereof. In particular cases, chemical heat treatment of part is performed by ion-plasma nitriding or ion-plasma cementation or ion-plasma carbonitriding.
EFFECT: higher efficiency and quality of chemical heat treatment, higher wear resistance of parts after chemical-thermal treatment.
3 cl, 1 ex
FIELD: oil-producing industry; mining; boring equipment.
SUBSTANCE: the invention is pertaining to the field of boring equipment and may be used at building-up of boreholes in the deep and superdeep drilling, and also at the open-cut mines at the blastholes drilling with blasting of the mine face by air. The method provides for the milling machining of each cog and deposition on it of an abrasive resistant protective coating. Before milling machining it is necessary to exercise turning machining of the inner and outer surfaces of the rolling cutter. After milling machining deposit an anticementing coating on the surfaces requiring protection against cementation. Then exercise cementation of the rolling cutter, its subsequent tempering in the oil, the low tempering, the bearing tracks grinding and coating by vapor deposition of an abrasive resistant protective coating on the cutter teeth and its intercrowned pits of the milling cutter. The protective coating has the hardness in the interval from HRC64 up to HRA72. Deposition of the protective coating is exercised, when the limiting temperature of heating-up of the rolling cutter does not exceed the temperatureof tn=280°C, at which the loss of strength of the cemented surfaces starts. The abrasive resistant protective coating is deposited in one or several layers till reaching the preset project depth of 0.2-0.8 mm. The technical result of the invention is the increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.
EFFECT: the invention ensures increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.
3 cl, 1 dwg
FIELD: metallurgy; restoration of working surface of crystallizer walls without disassembly of it.
SUBSTANCE: method of restoration of crystallizer walls made from copper and its alloys includes making notch, 0.5 mm deep at depth of wear of working surface no less than 1.0 mm. Then, working surface at depth of wear no less than 0.5 mm is subjected to shot-blasting after which precoat of thermo-reactive material, 0.1-0.2 mm thick and working layer of wear-resistant material are applied by gas thermal spraying. Depth of residual wear is no less than 0.5 mm.
EFFECT: enhanced resistance of coat.
FIELD: chemical industry; other industries; deposition of coatings by the gas-thermal methods.
SUBSTANCE: the invention is pertaining to the field of deposition of coatings by the gas-thermal methods, in particular, to the plasma deposition. The invention presents the method of preparation of the surface before the plasma deposition of chromium carbonyl. The method includes realization of the electrospark doping in the carbonic gas medium with utilization of the electrode formed from the powder on the basis of chromium. The doping is conducted at the following modes: the specific duration of the doping is 2-3 minutes/cm2, the discharge current - 0.6-0.9 A, the amplitude of the electrode vibrations is 60-70 microns, the frequency of the electrode vibrations is IOO Hz. The technical result of the invention is the increase of the cohesion strength of the gas-thermal coating with the substrate.
EFFECT: the invention ensures the increased cohesion strength of the gas-thermal coating with the substrate.
FIELD: metallurgy industry; mechanical engineering; other industries; methods of the vacuum-arc treatment of the metal products.
SUBSTANCE: the invention is pertaining to the field of the vacuum-arc treatment of the metal products before deposition on them of the coatings and may be used in metallurgy industry, mechanical engineering and other industries. The method provides for the vacuum-arc refining of the product-cathode and deposition of the coatings. Before deposition of the coatings the vacuum-arc refining is combined with the simultaneous complete or local oxidation of the surfaces, for example, up to the yellow, blue, violet, brown, black colors and-or tints and the combinations of the colors and tints. During the treatment of the long-sized products the local oxidation can be conducted in the form of the longitudinal and-or transversal straps and areas. The mode of the oxidation is exercised due to vibrations of the arc or the arcs, and-or due to for example the change - the increase of the power of the arc and-or the power emitted by the product caused by the electric current passing through it in the section from the electric current feeder from the power supply or the power supplies feeding the arc or the arcs to the product-cathode up to the electric arc or the arcs. The technical result of the invention is expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.
EFFECT: the invention ensures expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.
FIELD: technological process.
SUBSTANCE: invention is related to methods of surface preparation for plasma sputtering of coatings and may be used for cleaning of different surfaces with abrasive materials. Method includes abrasive treatment of surface that is subject to sputtering with thermal abrasive jet directed at the angle of 40...45° to processed surface. Jet is formed from high-temperature gas flow with abrasive loose material with fraction size of 0.3 - 0.7 mm. Processing is carried out until surface roughness is 40-50 micrometer, at that the mentioned surface is heated with high-temperature flow of gases up to 70 - 210°C.
EFFECT: provision of high-quality adhesion of coating with surface subject to sputtering.
SUBSTANCE: invention refers to methods of treatment of planing machine rollers. The method includes preparing of roller body surface and application of strengthening coating. Preliminary preparation of roller body surface is performed by means of its blowing-off under pressure with iron shot of 180...200 mcm fraction. Further two-layer strengthening coating is applied by the method of gas-detonation sputtering. Also the interior layer of coating is applied with powder of tungsten carbide of 55...65 mcm fraction obtaining thickness of the interior layer of 15...25 mcm. The exterior layer is applied with copper powder with additives not more, than 0.6%, obtaining the thickness of the exterior layer of 8...10 mcm.
EFFECT: upgraded wear resistance of sheet planing roller.