High temperature metal product and method thereof
(57) Abstract:The invention relates to metallurgy, particularly to a method of obtaining high temperature metal products. The inventive method comprises the deposition on the surface of high-temperature metal products for at least the first layer of the first metal deposition on the surface of at least the second layer of the second metal. The second layer of the second metal is precipitated at a depth sufficient to provide a predetermined molar ratio of the first and second metals, thus carry out the reaction processing, providing the integration of the first and second metals, forming intermetallic diffusion barrier layer. Get a high-temperature metal product, which has a total thickness of the diffusion barrier layer or layers of 0.1 - 10 μm, preferably from 0.8 to 3.0 μm. The use of the invention provides a uniform protective coatings for high temperature metal products. 2 C. and 7 C.p. f-crystals, 1 tab., 1 Il. The present invention relates to high-temperature metal product and method of its production.A useful application of m is such as prolonged exposure to high temperatures and alternating temperatures, which take place in gas turbine engines, the deterioration of environmental conditions can be very significant.For many years the technology has developed various protective coatings to prolong working life and/or increase the maximum allowable operating temperature of many materials. However, the coating selected for specific applications, for example, coatings having good resistance to oxidation or corrosion, are not necessarily compatible with the substrate material to which they are applied. In many cases there is a possibility of unwanted interaction between the substrate and the coating composition, resulting in worse physical and mechanical properties of the substrate. The destruction of metallic materials is accelerated at elevated operating temperatures.The formation of intermetallic protective layers of the high-temperature components is known from Japanese patent N 570155364, where intermittent intermetallic phase PtAl2thickness of about 35-50 m is formed as a result of the diffusion process layout plating at a temperature of 1150oC. high-Temperature materials - those materials which are capable of withstanding t is CI.In the published international patent application WO 89/07159 from 10.08.89, CL 23 C 28/02 disclosed is a method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products two layers, each of which contains more than two metal so formed several intermetallic compounds.Various formed intermetallic compounds provide varying degrees of protection of the substrate material. This protective coating does not provide the same degree of protection for the whole of the substrate material.The technical result of the present invention is to provide a method of obtaining high temperature metal products, providing a uniform protective coating for high-temperature components.This technical result is achieved in that in the method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products, at least the first layer of the first metal deposition on the surface, at least a second metal, according to the invention, the second layer of the second metal precipitated in depth the effect of the reaction processing providing the integration of the first and second metals, forming intermetallic diffusion barrier layer.The term "metal" is used to identify substrates made of metal, intermetallic materials or alloys.According to the present invention provide for applying a solid uniform diffusion barrier layer (barrier) as an intermediate layer between the protective coating and the surface temperature of the substrate material. The diffusion barrier layer serves to prevent the destruction of the protective coating system by minimizing interactions coating/substrate so that the effectiveness of the protective coating is maintained even if the coating composition may be disturbed (changed) because of losses due to surface oxidation/corrosion. The diffusion barrier layer also contributes to maintaining the physical and mechanical properties of the substrate due to the limitation of undesirable interactions.In particular, the method based on the formation in place a solid stable diffusion barrier layer by the subsequent grease the barrier layer of the intermetallic forms. This invention also extends to a diffusion blocking layers consisting of numerous intermetallic layers, each of which restricts the diffusion of a specific element (or elements) and not necessarily limited to the formation of one intermetallic diffusion barrier layer of a homogeneous structure. By selection of the corresponding intermetallic varieties mutual diffusion of the protective coating through the barrier layer can be minimized.In some cases, it may be advantageous to use several successive stages of deposition to form the required thickness of the first and second metals to the reaction processing.You can optionally surround the one or more layers of any metal and to carry out the reaction processing, ensuring the formation of multiple sequential diffusion blocking layers of different compositions, preventing diffusion due to the diversity of their species.It is desirable that the reaction treatment consisted of heating the deposited layers to a temperature sufficient for the implementation of the exothermic reaction between the metals alocale thermal excitation of deposited layers by processing the surface of a high energy, for example, a laser beam or plasma.It is expedient to provide for the formation of a complete protective system on the topmost layer of the diffusion barrier layer or layers before reaction treatment was applied finishes and produced on the spot reaction treatment formed a complete protective system consisting of a substrate metal products, a diffusion barrier layer or layers and final coating.Preferably the reaction, the treatment can be done in the face of pressure equal to ambient pressure.This technical result is achieved by the fact that high-temperature metal product according to the invention, obtained as described above and has a total thickness of the diffusion barrier layer or layers is between 0.1 and 10 microns.It is advisable that the total thickness of the diffusion barrier layer or layers was equal to from 0.8 to 3.0 μm.Hereinafter the invention will be described by example with reference to the drawing which is a diagram of the sequence of steps required to implement the method according to the invention.As shown in the drawing, Fig. 1, stage 1 represents the deposition of the first with the Oh for reacts thermal diffusion locking cover and the stoichiometric ratio of metal "A", contained in the coating.The second stage is the deposition of the second metal "B" on the first layer deposited on the first stage. Here also, the thickness tBthis second layer is a function of the thickness for the final heat diffusion barrier layer and the stoichiometric ratio of contained metal "B".Stage 3 is the stage of the reaction processing, resulting in the connection of two discrete layers of metals "A" and "B" in one diffusion barrier layer of intermetall "AB".Taking into account the fact that the resulting reaction diffusion barrier layer AxByis the stoichiometric intermetallic product, to obtain the desired stoichiometry, it must contain proportional to the number x of moles of metal "A" and "y" of moles of metal "B". If the corresponding values of the atomic weight (M) of both metals is equal to MAand MBand the values of their density (p)-pAand pBin this case, the ratio of thickness tAand tBshould be equal to the same ratio as:
xMAyMB< / BR>pApB< / BR>This relationship suggests that the thickness of the right of proportional associated with the interactions of the solid/gas or solid/solid. Where there is a depletion to a certain extent, should be made an appropriate adjustment of the relative thickness of the respective layer or layers.Example 1
The above-described method was successfully applied to the substrate is a titanium alloy, industrial known under the brand name M. In this case, the diffusion barrier layer was necessary as an intermediate layer between the substrate and resistant to oxidation coating. The goal is resistant to oxidation coating was to prevent the entry of oxygen, thereby limiting the formation of brittle surface layer, which is otherwise the case can significantly degrade the mechanical properties of the titanium substrate.The sequence outlined above steps used to form the intermetallic layer PtAl2on the basis of the reaction of the sequential deposition of Pt and Al layers using the atomization method when the DC offset on the surface layer.In order to reduce to a minimum the potential interactions of solid/solid material between the substrate and the first metal "A", especially due to the high diffusion coefficient of aluminosis according to the relation:
< / BR>(recall that for the Pt-Al2x=1 and y=2).Depletion of the outer aluminum layer due to oxidation by atmospheric air were not allowed due to the fact that the reaction processing was carried out under conditions of moderate vacuum at approximately 2.0 to 10-5bar. In this case, the processing was heated for 2 hours at a temperature of 750oC. Diffraction analysis x-ray surface diffusion locking cover confirmed that the desired crystalline morphology PtAl2.The so formed solid intermetallic layer PtAl2then covered resistant to oxidation by a layer of Ni/Cr 80/20. Oxidative heat treatment for 100 hours in air at 700oC subsequently showed full efficacy layer PtAl2as a diffusion barrier layer for Nickel. Moreover, etching the substrate surface showed no signs of a surface layer, confirming the effectiveness of the layer Ni/Cr as a barrier layer preventing oxidation.Other intermetallic compounds formed as a diffusion blocking layer on the substrate P are TiAl and (PtTi2served as a diffusion blocking layer for each of the substrates NiCr, NiCrAl, NiAl and Ni.After the formation of the diffusion barrier layer on the substrate NiCr and NiAl and use final coating each sample was subjected to oxidative heat treatment for 80 minutes at 1050oC and for 40 minutes at 1150oC. Diffusion barrier layer (PtTi3+TiAl) on the substrate mark M were subjected to oxidative heat treatment at 700oC for 100 hours. Each of the treatments demonstrated the effectiveness of the respective diffusion blocking layer.The substrate for intermetallic diffusion blocking layers PtAl3and TiAl was formed from a titanium-aluminum alloys.The following table illustrates the formation of a diffusion barrier layer for a particular substrate materials with the corresponding normal thickness of the diffusion blocking layer, and with an effective test conditions. 1. The method of obtaining high temperature metal products, including deposition on the surface of high-temperature metal products for at least the first layer of the first metal, the wasp is the second metal precipitated on the depth, sufficient to provide a predetermined molar ratio of the first and second metals, and carry out the reaction processing, providing the integration of the first and second metals, forming intermetallic diffusion barrier layer.2. The method according to p. 1, characterized in that for the formation of the required thickness of the first and second metals before reaction treatment is carried out several successive stages of deposition.3. The method according to any of paragraphs.1 to 2, characterized in that it further precipitated by one or more layers of any metal and carry out the reaction processing, ensuring the formation of multiple sequential diffusion blocking layers of different compositions, preventing diffusion due to the diversity of their species.4. The method according to any of paragraphs.1 to 3, characterized in that the reaction processing includes heating the deposited layers to a temperature sufficient for the implementation of the exothermic reaction between the metals or each diffusion barrier layer.5. The method according to any of paragraphs.1 to 4, characterized in that the reaction processing includes thermal excitation of deposited layers the way the PP.1 - 5, characterized in that for the formation of a complete protective system on the topmost layer of the diffusion barrier layer or layers before the reaction processing is applied finishes and produce on the spot reaction processing educated a complete protective system consisting of a substrate metal products, a diffusion barrier layer or layers and final coating.7. The method according to any of paragraphs.1 - 6, characterized in that the reaction treatment is carried out under conditions of pressure equal to ambient pressure.8. High temperature metal product, characterized in that it is obtained by the method according to any of the preceding paragraphs.1 to 7 and has a total thickness of the diffusion barrier layer or layers of 0.1 to 10.0 μm.9. High temperature metal product under item 8, characterized in that the total thickness of the diffusion barrier layer or layers is equal to from 0.8 to 3.0 μm.
FIELD: metallurgy, namely processes for applying wear resistant chrome carbide coatings, protection of surface of articles of titanium and its alloys against action of aggressive media, abrasive wear and high temperature influence.
SUBSTANCE: method comprises steps of applying sub-layer of metal and further applying of wear resistant chrome carbide layer by pyrolysis of chrome-organic compounds of bis-arene. Before applying wear resistant layer of chrome carbide, sub-layer of nickel or its alloys with thickness 0.1 - 10 micrometers is applied.
EFFECT: possibility for applying on titanium and its alloys wear resistant coating with enhanced adhesion degree of coating and substrate and with improved strength against crumpling at elimination of cracking.
4 cl, 1 tbl, 4 ex
FIELD: mechanical engineering; methods of depositing of the chromium coatings on steel details.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the method of depositing of the chromium coating on the steel details and may be used for restoration and hardening of surfaces of the friction components of machines. The method includes an electrolytic deposition on a substrate of a chromium coating out of chromium-containing solutions at presence of a catalytic agent. Then conduct an anodic etching in the same electrolyte keeping to the following modes: a current density of 40-50 A/dc2, the temperature of the electrolyte - 50-65°C. After the anodic etching they exercise deposition of an additional layer of the chromium coating from a gas phase of chromium hexacarbonyl by a thermal dissociation. In the particular cases of the invention realization the depth of the galvanic chromium layer makes 5-15 microns, and the increase of the coating thickness up to a required value is gained with the help of a thermal dissociation of the chromium hexacarbonyl vapors from the gaseous medium. The technical result of the invention is an increased adhesive strength of the coating with the substrate and an increased productivity of the process.
EFFECT: the invention ensures an increased adhesive strength of the coating with the substrate and a raise of the process productivity.
2 cl, 1 tbl, 3 ex
FIELD: galvanoplastics; methods of production of art articles.
SUBSTANCE: the invention is pertaining to the field of galvanoplastics and may be used at manufacture of the art articles. The method provides for sensitization of the surfaces of the model in the solution of stannum chloride (II) with addition of hydrochloric acid, chemical metallization and galvanic copper coating. At that before the sensitization the surface of the model wetted with solution of stannum chloride stannum (II), then the model is coated with the layer of the acrylic lacquer, and after sensitizations conduct hydrolysis. At that the chemical metallization is conducted in the solution of silvering in the following composition of components (in g/l): silver nitrate - 2; 25 % ammonia water solution - 10; 10 % caustic potassium water solution - 18; and at galvanic copper coating apply a current of the low cathode density of 0.5 A/dm2. The technical result: the invention allows to realize metallization of the ill- wettable surfaces of plants and insects, to improved quality of metallization of insects and plants.
EFFECT: the invention allows to realize metallization of the ill- wettable surfaces of plants and insects, to improved quality of metallization of insects and plants.
FIELD: chemical and electrochemical application of layers of noble metals from aqueous solutions; chemical, radio-electronic and electrical industries.
SUBSTANCE: proposed method includes application of intermediate silver layer by chemical method in aqueous solution or by use of silver article, after which article is immersed as cathode in aqueous solution containing palladium ions and cementation and electrodeposition are performed.
EFFECT: possibility of obtaining thick layers of noble metals possessing developed surface.
2 cl, 2 ex
FIELD: building industry; method and devices allowing to make the three-dimensional visual effects on the surface of the metallic material.
SUBSTANCE: the invention is pertaining to application of the coatings on the surfaces of the metallic materials. The method provides for application of the coating made out of the metal or out of the metal alloy. The first layer of the applied coating has the depth smaller or equal to 2.5 microns. Then conduct the thermal treatment of the first layer of the coating by means of the fast heating by heating the surface of the first layer of the coating up to the temperature laying within the limits from0.8 Tf up tothe temperature of Tf, whereTf is the temperature of smelting of the metal or the metal alloy, which is used in application of the first layer of the coating. Then they apply the second layer of the coating from the metal or the metal alloy with the depth smaller or equal to 1 micrometer. The invention also presents the material containing the indicated layers as well as the device for application of the coating on the metallic material in the form of the strip, which contains the tool for the strip pulling and the tool for application of the coating. On the path of motion of the dawn strip there are in series mounted the following tools: the tool for application of the first layer on the strip; the strip fast heating tool, which is capable to heat the surface of the first layer up to the above-indicated temperature; the tool for application on the strip of the second layer of the metal or the metal alloy. The technical result of the invention is creation of the method and the device allowing to produce the three-dimensional visual effects on the surface of the metallic material.
EFFECT: the invention ensures creation of the method and the device for production of the three-dimensional visual effects on the surface of the metallic material.
24 cl, 6 dwg, 8 ex
FIELD: manufacture of articles with normalized properties of surface layer, namely for improving strength of press tools at pressing shapes of titanium alloys.
SUBSTANCE: method comprises steps of surfacing hard alloy layer forming reinforcing structure onto base material; applying by electric spark alloying layer of hard alloy having plastic components onto surfaces layer of hard alloy in order to provide coating with reinforcing effect; then applying onto surface of formed coating additional layer having oil-phobic properties.
EFFECT: enhanced strength of part with such coating, lowered stresses of base metal.
2 cl, 1 ex
FIELD: foundry, possibly technology, painting art and architecture.
SUBSTANCE: method comprises steps of forming pattern of article for making according to it rough mold; performing sand blasting of working surface of rough mold; depositing onto its surface layer of alloy being material of decorative article; releasing deposited layer from rough mold due to difference of thermal expansion factors of materials of deposited layer and substrate.
EFFECT: possibility for making thin-wall decorative articles of metals and alloys with high surface quality, small mass due to their porous structure and thin wall and with mechanical properties sufficient for using article in interior.
4 dwg, 1 ex
SUBSTANCE: invention relates to method of manufacturing of functional surface and can be used in mechanical engineering, for instance, for forming of reflecting and other metal-containing coatings. It is implemented gas-dynamic sputtering by powder material with rains size 0.01-50 mcm from chosen materials and material in the form of spheroidized particles with size 70-300 mcm made of steel and other solid magnetic medium It is used feedback system between coating thickness and density of evaporated material flow and/or velocity of travel sputtering spot of evaporation relative to detail surface. Evaporated powder material is tagged rate providing connection to the surface and to particles of treated material - rate, providing impact moulding of evaporated material. It is implemented surface finish by programmable mechanical operation till nominal dimensions of its profile and roughness. Process is implemented with simultaneous pumping out, catching and separation of materials particles. Temperature of surface and gas powder flow of evaporated material is lower the temperature of recrystallisation soft component of evaporated powder material.
EFFECT: receiving of reflecting surface with defined parameters of curvature and roughness.
3 cl, 1 dwg
FIELD: chemistry; metallurgy.
SUBSTANCE: deposited metal is dissolved in melted lead or eutectic Pb-Bi, with a temperature gradient 500-600°C ensured between the melt with the dissolved metal and a steel plate surface pre-coated with lead by steel plate cooling. Then metal is deposited on the steel plate surface in inert gas medium due to the temperature gradient between the melt surface and the sheet surface. The thickness of prepared nanostructured layer is controlled by process time.
EFFECT: improved mechanical properties and performance attributes.
5 cl, 1 dwg, 2 ex
FIELD: chemistry; metallurgy.
SUBSTANCE: ceramic substrate is placed on melted lead or eutectic Pb-Bi surface with dissolved deposited metal. Then the ceramic substrate surface is cooled to ensure temperature gradient 600-700°C between the melt and its surface. Further it is kept in the inert gas medium until nanostructured metal plate of the required thickness is deposited on the ceramic substrate surface. Thereafter the plate is removed from the substrate.
EFFECT: improved durability.
5 cl, 1 dwg, 3 ex