Heat resistant metal-ceramic coating and method of its application

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for production of parts with increased heat resistance. In heat-resistant metal-ceramic coating, consisting of metals high-melting oxides alternating layers separated with plastic metal compensation layers, high-melting oxides layers are additionally contain not more than 40 % of plastic metal, and compensating layers are additionally contain not more than 20 % of high-melting oxides. Each plastic metal compensating layer is made with thickness of not more than 100 nm and in 1.5–20 times less than ceramics layer thickness. As high-melting oxides layers hafnium oxide or zirconium oxide can be used, and compensating layers contain up to 50 % of rare-earth metals.

EFFECT: alternating oxide and compensating layers are sprayed with smooth change of composition.

4 cl

 



 

Same patents:

FIELD: machine building.

SUBSTANCE: invention relates to machine building, and can be used in aviation and power turbine engineering to apply the heat protecting coating on the tract surface of work and nozzle blades of the turbine of the gas-turbine engine. The ceramic heat protecting coating for the products out of heat-resistant cast nickel alloys contains in wt %: Gd2O3 - 2-9; Y2O3 - 7-9, and ZrO2 - rest.

EFFECT: increased in range of work temperatures 1100-1150°C of heat resistance and coefficient of thermal conductivity of coating to 1 W/m·K.

2 cl, 4 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to slurries for aluminising superalloy components and may be used for the manufacture of components exposed to hot corrosive gases, like, for example, gas turbine components. The slurry comprises an organic binder and a solid content including aluminium, yttrium and hafnium; it also comprises a sulphur content which is not more than 5 ppm by weight of the composition. A superalloy component (1) comprising an aluminide coating, where the coating comprises at least one layer (3), comprising hafnium and yttrium in addition to aluminium.

EFFECT: improved oxidation and corrosion resistance of the superalloy components with the aluminide coating.

20 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: protective coating for protection of a structural component of a gas or a steam turbine against corrosion and/or oxidation, namely at high temperatures, which is made in the form of a single metal layer from an alloy containing the following, wt %: cobalt 24-26, chrome 12-14, aluminium 10-12, and 0.2-0.5 of at least one element of the group including scandium and rare-earth elements, and nickel is the rest. The coating has no tantalum, rhenium and silicone.

EFFECT: coating is characterised by high properties of resistance to high-temperature corrosion and oxidation.

4 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal cutting tools. Proposed coating comprises at least one multiply with composite nano-ply composed of crystalline (TixAlyCrz)N and amorphous Si3N4, note here that 0.25≤x≤0.75, 0.25≤y<0.75, 0.05≤z≤0.2, 0.85≤x+y+z≤?0.,97mm. Atomic ratio of silicon makes 1-x-y-z and 1-x-z<0.,75, while nano composite ply depth makes 1-100 nm. Coating is deposited by physical deposition from vapour phase (PVD) at deposition temperature of over 500°C and at nitrogen partial pressure of at least 0.03 mbar.

EFFECT: higher strength of coating.

22 cl, 8 dwg, 3 ex, 3 tbl

FIELD: metallurgy industry.

SUBSTANCE: invention relates to the field of protecting metals against corrosion, in particular structural elements that are exposed to sea water and/or hydraulic structural components. A corrosion-resistant coating has corrosion resistance that meets the standard ASTM G48, the method A, and consists of the first inner layer and the second outer layer deposited on the first layer, and the second outer layer is a layer of a metal-nickel alloy, where the metal is selected from the group consisting of tin, copper, iron, tungsten and cobalt or an alloy of these metals, and the first inner layer is a bronze alloy or a layer of a metal from the group consisting of molybdenum, niobium, cobalt, vanadium, manganese, titanium, and magnesium or an alloy of these metals. The method comprises the deposition of the first inner layer on the surface of the substrate, and the deposition of the second outer layer on the first layer, and as the second outer layer a layer of a metal-nickel alloy is deposited, where the metal is selected from the group consisting of tin, copper, iron, tungsten and cobalt or an alloy of these metals, and as the first inner layer a layer of bronze alloy is deposited or a metal layer of the group consisting of molybdenum, niobium, cobalt, vanadium, manganese, titanium, magnesium or an alloy of these metals.

EFFECT: improved mechanical strength and corrosion resistance of the coating.

5 cl

FIELD: chemistry.

SUBSTANCE: invention relates to a multilayered thermal barrier coating on components of a hot path of energy gas turbine installations of high power. The multi-layered thermal barrier includes a basic metal sublayer, made from a nickel-based alloy, an upper ceramic thermal barrier layer and an additional metal thermal barrier sublayer between the basic sublayer and the ceramic layer. The basic metal sublayer contains 18…25% of cobalt, 14…20% of chrome, 11…14% aluminium and 0.1…0.7 yttrium. The upper ceramic thermal barrier layer is made from a material based on zirconium dioxide ZrO2, partially stabilised 6…8% by yttrium oxide weight. The additional metal thermal barrier layer is made from a nickel-based alloy, containing 18…25% of cobalt, 14…20% of chrome, 10…13% of aluminium and 0.1…0.7 of yttrium.

EFFECT: protection against an impact of high temperatures, erosion and corrosion by the formation of long-lasting thermal barrier coatings.

1 ex

Refractory alloy // 2526657

FIELD: metallurgy.

SUBSTANCE: refractory alloy contains the following element in wt %: titanium 20-35, vanadium 20-35, niobium 20-35, aluminium 5-15, tantalum 2-10, zirconium 1-15. Magnitude of the alloy formation configuration entropy corresponds to the following ratio: ΔSmix=R∑Ci·lnCi≥11.2, where ΔSmix is configuration entropy, J/(mole·K), R is universal gas constant equal to 8.31 J/(mole·K), Ci is concentration of ith element, at. %.

EFFECT: better manufacturability, higher plasticity, low density, higher strength.

4 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to the field of obtaining materials suitable for formation of high-temperature erosion-resistant protective coatings on especially heat-resistant construction materials (carbon-carbon and carbon-ceramic composite materials, graphites, alloys based on refractory metals), widely used in the aerospace, rocket and other branches of industry. To realise the claimed method first prepared is a multi-component mixture, containing (wt %): Ti - 15.0÷40.0, Mo - 5.0÷30.0, Y - 0.1÷1.5, B - 0.5÷2.5, Cr - 0,2÷6,0, one or several elements of group VIII - 7.0÷10.0, Si - the remaining part, or Ti - 15.0÷40.0, Mo - 5.0÷30.0, Y - 0.1÷1.5, B - 0.5÷2.5, Cr - 0.2÷6.0, one or several elements of group VIII - 7.0÷10.0, Mn - 1.5, Si - the remaining part, or Ti - 15.0÷40.0, Mo - 5.0÷30.0, Y - 0.1÷1.5, B - 0.5÷2.5, Si - the remaining part. The obtained mixture is used to smelt an alloy, which is crushed to powder with a dispersity of 43÷100 mcm, thread-like SiC crystals are introduced in an amount of 2.0÷15.0 wt % with joint dispersion until the most suitable for further coating formation size is achieved. SiC is taken in the form of long-fibre thread-like crystals with a length to diameter ratio L/D≥1000.

EFFECT: increased erosion resistance of coatings with simultaneous preservation of a self-recovering ability of a protective layer.

3 cl, 2 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, and namely to nickel-based alloys of protective coatings of parts of a gas turbine. Nickel-based alloy for the protective coating of gas turbine parts contains the following, wt %: cobalt 24-26, chrome 16-25, aluminium 9-12, yttrium 0.1-0.7 and/or at least one metal of the group containing scandium and rare-earth elements, non-obligatorily, phosphorus 0.1-0.7, non-obligatorily, silicon 0.1-0.6; it does not contain rhenium; nickel is the rest.

EFFECT: protective layer has high corrosion and oxidation resistance at high temperature.

18 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in aircraft and power engineering. Plies of chromium and aluminium are deposited and subjected to high temperature annealing in vacuum at 1050±5°C, residual pressure of 1.3(10-1-10-3) Pa for 2-5 hours. Chromium ply deposition from gas phase is executed at thermal decomposition of Cr(CO)6, while that of aluminium ply is performed at thermal decomposition of Al(CH3)3. Note here that at chromium decomposition Cr(CO)6 is heated to 110-120°C to set 400-450°C in deposition area while chromium ply is formed during at least 2-3 hours. At aluminium deposition Al(CH3)3 is heated to 100-110°C to set 300-350°C in deposition zone while aluminium ply is formed at least 5-6 hours. Proposed device comprises reaction chamber arranged inside vacuum chamber and separated by heat-insulating dense-vacuum web to preliminary zone and deposition zone that feature different temperature fields. Heated containers to accommodate coating material sources are arranged outside vacuum chamber and connected via heated transfer systems and heated valves with inlet into reaction chamber preliminary zone. Temperature field is created by heating system with the help of temperature field formation shields arranged in reaction chamber deposition zone.

EFFECT: higher quality of coating for operation at higher temperatures.

2 cl, 1 dwg, 1 tbl

FIELD: engines and pumps.

SUBSTANCE: blades surface is prepared by machining of the defected places, by the blade sand blasting, cleaning and degreasing. To the entire surface of the blade body the underlayer of self-fluxing nickel-based alloy, for example "ПР-Н80Х13С2Р", with thickness up to 0.2 mm is applied by microplasma spattering, the alloy plays the role of heat-resistant solder. At that surface of the defected places is levelled with the rest surface. Surface of the said underlayer is subjected to the sand blasting. By plasma method layer of the heat-resistant material is spattered, for example "ВКНА", with thickness up to 0.6 mm with assurance of the specified blade profile. The blades with the applied coatings are heat treated in vacuum by heating to temperature of liquidus of the self-fluxing alloy, and holding at this temperature for 3-5 minutes.

EFFECT: increased operation properties of blades due to improved adhesion strength of the sputtered layer of the heat-resistant material.

3 cl, 1 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to application of protective ion-plasma coatings and can be used in machine building, for example, for protection of turbo machine working and guide vanes. Proposed method comprises placing the parts in vacuum chamber, application of electric shift potential, ionic surface cleaning and coating application of cathode material arc evaporation. Said cathode is composed by a cylindrical shell with magnetic retainer of cathode spots area. Retainer can form the cathode spots as a strip directed along cathode cylindrical shell lengthwise axis. Said retainer displaces along the path coaxial with the circumference of cathode cylindrical shell with maintenance of its orientation. Reciprocation of cathode spots area on said strip is performed by the changeover of polarity of cathode opposite ends. This unit exploits the cathode central position in vacuum chamber.

EFFECT: uniform coating.

18 cl, 4 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: method includes placing an article in a working chamber and evacuating said chamber; plasma pretreatment of the article by ion-beam cleaning with argon and exposing the article to the plasma of an oxidant-containing gas at Pwork=100-10-1 Pa, said gas being oxygen; evacuating the working volume to residual pressure Pres=10-1-10-3 Pa; reactive arc cathode sputtering in the medium of a reactive gas - oxygen or nitrogen or a mixture of nitrogen and oxygen and depositing on the surface of the article a ceramic barrier coating at operating pressure of the reactive gas Pwork=10-2-10-1 Pa. In another version of the invention, evacuation of the working volume to residual pressure Pres=10-1-10-3 Pa is followed by reactive sputtering of a magnetron target at discharge current I=1.5-20 A and operating pressure of the reactive gas, which consists of oxygen or a mixture of nitrogen with argon or a mixture of nitrogen with oxygen and argon, Pwork=10-2-100 Pa, wherein the cathode or magnetron target is made of a metal selected from: copper, aluminium, tin, chromium, titanium, zirconium, molybdenum, tantalum, nickel, magnesium, tungsten, iron or an alloy based thereon.

EFFECT: obtaining ceramic barrier coatings with resistivity greater than 10 ohm·m.

2 cl, 2 ex

FIELD: technological processes.

SUBSTANCE: invention relates to a plant and a method to apply a coating onto a substrate. The plant comprises a vacuum chamber, in the inner space of which the substrate is placed for application of a coating onto it, and at least one sprayed target, and a device to determine wear of the sprayed target. Application of the coating is carried out by ablation of the target in process of plant operation and bombarding of the substrate with produced particles. At least one window is available in the wall of the vacuum chamber. The device to determine wear of the sprayed target comprises a metering device for optical measurement of the distance between at least one previously determined point outside the vacuum chamber and at least one previously determined point on the surface of the sprayed target. The metering device also comprises an assessment device, by means of which one of the following is corrected: parallax or geometric distortion of planar surface of the target.

EFFECT: method improvement.

13 cl, 6 dwg

FIELD: physics.

SUBSTANCE: invention relates to a method of making a workpiece of a light-reflecting element for optical systems, which includes preliminary chemical-mechanical treatment of the surface of irregularly shaped components, and forming a metal-coated reflecting layer. Formation of the metal-coated light-reflecting layer on an iridium base is carried out after removing the replica, after successively depositing a chemical zinc sublayer, a nickel-phosphorus layer with thickness of up to 200 mcm, which is subjected to heat treatment at 110-400°C and high-intensity polishing to 6-8 E to obtain a duplicated matrix surface, followed by formation of a bearing layer of galvanic nickel from a sulphamic electrolyte of the following composition (g/l): sulphamic nickel 300-400; nickel dichloride 12-15; boric acid 25-40; sodium lauryl sulphate 0.01-0.1; saccharine 0.008 with current density of 2.5 A/dm2, temperature of 55-60°C for 8 hours, followed by removing the obtained metal-coated replica from the matrix by thermal shock, and depositing the light-reflecting iridium layer by high-precision cathode sputtering on the inner surface of the nickel replica to form a thin-wall light-reflecting element for subsequent installation into an optical system.

EFFECT: improved optical and geometric properties, adhesion of the nickel-phosphorus coating to the matrix and mechanical strength thereof.

1 ex, 1 dwg

FIELD: electricity.

SUBSTANCE: invention relates to the field of obtaining of coatings of pole tips (PT) (anode and cathode) of endocardial electrode (ECE) of cardiostimulator. The thin-film coating consists of the porous layer of biocompatible metal with the thickness L/n1, where n1=1.3÷3, formed from dust of metals with the medium size of fractions d=L/n1, where L - unevenness of PT ECE working surface, layer of biocompatible nitride of metal MeN, obtained by PVD method with column high-porous structure with the thickness Λ=d/n2, where n2=1.3÷10, and ion-modified surface layer MeN with the thickness δ=Λ/n3, where n3=1.3÷100. PT ECE surface is pre-processed by sand blasting with unevenness L=60-100 mcm. A porous layer of biocompatible metal is applied by plasma gas thermal method at atmospheric pressure in the atmosphere of argon with dust of metal with the size of particles d=L/n1. A layer of biocompatible nitride of metal MeN is applied by PVD method in nitrogen atmosphere at the pressure ~1·10-3 Torr at the temperature 450-500°C. The surface is processed by a beam of ions of biocompatible metals Me with energy 20-100 keV and the dose no less than 1017 particles/cm2.

EFFECT: obtaining of thin-film coating, biocompatible, corrosion resistant in blood plasma, with high near-electrode Helmholtz capacity, characterised by high adhesion to the product and mechanical strength.

8 cl, 1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a multilayered thermal barrier coating on components of a hot path of energy gas turbine installations of high power. The multi-layered thermal barrier includes a basic metal sublayer, made from a nickel-based alloy, an upper ceramic thermal barrier layer and an additional metal thermal barrier sublayer between the basic sublayer and the ceramic layer. The basic metal sublayer contains 18…25% of cobalt, 14…20% of chrome, 11…14% aluminium and 0.1…0.7 yttrium. The upper ceramic thermal barrier layer is made from a material based on zirconium dioxide ZrO2, partially stabilised 6…8% by yttrium oxide weight. The additional metal thermal barrier layer is made from a nickel-based alloy, containing 18…25% of cobalt, 14…20% of chrome, 10…13% of aluminium and 0.1…0.7 of yttrium.

EFFECT: protection against an impact of high temperatures, erosion and corrosion by the formation of long-lasting thermal barrier coatings.

1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the field of electrochemistry, namely to a method of mixing particles of carbon-based electrocatalysts in vacuum, which consists in the fact, that mixing is carried out in a vacuum work chamber, equipped with a device for an inert gas supply and a holder of powder of particles of the electrocatalysts. Mixing is realised by the creation of a fluidised layer. The method is characterised by the fact, that for placement of the electrocatalyst powder applied is a porous substrate with open porosity, made from an inert material, pneumatically connected to a device of autonomous gas supply, placed in the holder, and the inert gas is blown through the porous substrate with the formation above the substrate of the fluidised layer of the electrocatalyst particles.

EFFECT: application of the claimed invention makes it possible to increase efficiency of its application for the electrochemical catalysts on carbon carriers, such as soot, nanotubes or nanofibres, possessing a highly developed surface, by the reduction of the particles adhesion and ensuring their rotation in the fluidised layer.

2 cl

FIELD: chemistry.

SUBSTANCE: invention relates to coated components and production thereof. A multilayer coating contains at least one type A layer, wherein the type A layer substantially consists of (AlyCr1-y)X, where X denotes one element from a group consisting of N, CN, BN, NO, CNO, CBN, BNO and CNBO, y describes a stoichiometric composition of a metal phase fraction, at least one type B layer, wherein the type B layer substantially consists of (AluCr1-u-v-wSivMew)X, where X denotes one element from a group consisting of N, CN, BN, NO, CNO, CBN, BNO or CNBO, wherein Me denotes one element from a group consisting of W, Nb, Mo and Ta, or a mixture of two or more constituents of said group, u, v and w describe the stoichiometric composition of a metal phase fraction, wherein the ratio of the thickness of said type A layer to the thickness of said type B layer is greater than 1. The method of producing a component with said multilayer coating is characterised by depositing at least one type A layer onto said surface of the component and depositing at least one type B layer onto said component. Said at least one type A layer is deposited using nx targets. Said at least one type B layer is deposited using ny targets, wherein nXy targets used to deposit the type A layer are simultaneously used, wherein nx, ny and nXy are integers greater than or equal to 1, and at least one of said targets used to deposit the type A layer is active at both steps a) and b).

EFFECT: obtaining a multilayer coating having improved wear resistance, mechanical and thermal properties, particularly hardness at high temperatures and oxidation resistance.

23 cl, 9 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: method of making proposed coat for aircraft and rocket gas turbines and combustion chambers comprises application of alternating ceramic and metal plies on working surface by ion-plasma spraying. First metal ply is applied on said surface. All metal lies are made of identical-depth nickel, depth making at least 4 mcm. Ceramic different depth plies are made of zirconium oxide stabilised by yttrium oxide. First ceramic layer, if seen from working surface, features depth of at least 1-2 mcm. Every next ceramic ply features the depth increased by 2-3 mcm Outer surface ceramic layer features depth of 20-30 mcm.

EFFECT: higher thermal strength and heat resistance.

1 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to making of protective coating on parts subjected to high temperatures and mechanical stresses. Proposed method comprises cleaning of parts and vacuum chamber in glow discharge in inert gas atmosphere, ionic etching and coat application by deposition from vapour phase. Note here that prior to coat application the ion-plasma cementation is executed along with ionic etching. This is performed by feed of carbon-containing gas into the chamber and part heating with the help of two magnetrons operated in dual mode. Cementation is alternated with ionic etching in N steps, where N ≥ 1, while application of coating is executed by sequential forming of consecutive alternating plies of at least one micro ply consisting of chromium and the alloy of aluminium with silicon of total depth of 1.9-2.8 mcm and at least one micro ply consisting of chromium, aluminium and silicon oxides of total depth of 0.4-1.6 mcm produced at oxygen feed into said chamber. Note here that said micro plies consist of nano plies of said materials of 1-100 nm depth composed at part feed by magnetrons with targets of chromium and alloy of aluminium with silicon.

EFFECT: longer life, higher heat resistance at high-temperature oxidation and erosion.

1 ex, 1 tbl

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