Combination coating applying method

FIELD: metallurgy, namely chemical and heat treatment of refractory alloys, possibly used for applying protective coatings onto blades of gas-turbine engines.

SUBSTANCE: method comprises steps of applying onto inner and outer surfaces of parts diffusion aluminide coating in circulating gaseous medium; applying coating in low-active system at relation of reaction surfaces Fн/Fo = 0.3 - 0.7, where Fн - total surface of parts to be coated; Fo - total surface of saturating mixture; then applying onto outer surfaces of parts cladding coating, namely MeCrAlY, where Me - Ni, Co, NiCo by ion-plasma process or electron beam evaporation in vacuum.

EFFECT: improved fire and corrosion resistance of coating, increased resource of blades of gas-turbine engine.

1 cl, 1 ex, 1 tbl

 

The invention relates to metallurgy, in particular to the chemical-thermal treatment of heat-resistant alloys, and can be used for the deposition of protective coatings on the blades of gas turbine engines.

There is a method of coating in which the electron-beam method is applied protective coating NiCrAlY, and then by the method of powders spend eletrownia (Pthological. High-temperature protective coatings for Nickel alloys. - M.: Mashinostroenie, 1991, p 146; Lakhtin, Y.M., Arsamakov BN. Chemical and thermal processing of metals. - M.: metallurgy, 1985, p 253-254).

The known method of two-stage hamiltoniana, in which the first by plating, and then eletrownia (Pthological. High-temperature protective coatings for Nickel alloys. - M.: Mashinostroenie, 1991, p.86)

There is a method of coating yoboinewnue in the powder mixture, followed by alteromonas (Arsamakov BN. Chemical and thermal processing of metals in the activated gas environments. - M.: mechanical engineering, 1979, pp.92).

There is a method of coating in which the vacuum-plasma technologies for high energy on the installation map-1 cause the protective coating NiCrAlY (Abajian S.A., Kablov E.N., Budinovskiy S.A. Vacuum-plasma technology for protective coatings of complex alloyed alloys, MiTo is. 1995, No. 2, S. 15-18).

A disadvantage of known methods is intense diffusive exchange between the sprayed NiCrAlY layer and the alloy parts are formed is enriched in chromium zone, which, under certain conditions, leads to the formation of topologically close-Packed phases, reducing the strength characteristics of the parts (plasticity, fatigue). No protective coating in the inner cavities of the details.

The closest in technical essence is a way of drawing on external and internal surfaces of the diffusion aluminide coverage in the circulating gas (patent RF №1238597, With 23 10/00, 1984).

The disadvantage of this method is the low resistance of the coating due to the small thickness of the coating (50-60 μm), which reduces the resource of the blades during operation.

The objective of the invention is improving the heat resistance of the coating due to the protection of surfaces from high temperature oxidation.

This object is achieved in that in the method of applying a combined coating, mainly on the details of heat-resistant alloys with internal channels, including drawing on external and internal surfaces of the diffusion aluminide coverage in the circulating gaseous medium, diffusion aluminide coating is applied on a light mechanism with respect to the reaction is ionic surfaces F n/Fo=from 0.3 to 0.7, where Fn- the total surface parts, which are coated, Fo- the total surface saturating the mixture, and then ion-plasma method or electron-beam evaporation in vacuum on the outer surfaces of the parts put a cladding coating MeCrAlY, where Me-Mi, Co, NiCo.

The proposed technical solution, details on inflict double-layer combo floor: first layer - diffusion aluminide floor put gas circulation method on the inner and outer surfaces of the parts, and then the outer surface of the ion-plasma method or electron-beam evaporation in vacuum, put the second layer - coating MeCrFlY, where Me is Ni, Co, NiCo.

The first layer coating is carried out at a temperature of 950-1050°in a sealed volume with forced circulation of the gas phase between the saturating mixture and detail. The mechanism of formation of the coating depends on the activity of circulating the gas mixture is determined by the ratio of the number of aluminium supplied by saturating the mixture, and the amount of aluminum consumed for the formation of the coating on the parts. Time and operating temperature of the process, in General, determine the thickness of the resulting coating, and the mechanism of formation of the coating is regulated by the partial pressure ll3. It is established that AK is Yunosti circulating the gas mixture is proportional to the ratio of the conditional reaction surfaces F n/Faboutwhere Fn- the total surface parts, which are coated, Fabout- the total surface saturating the mixture. To obtain a uniform protective coating ratio of the conditional reaction surfaces must be within Fn/Fabout=0,3-0,7.

To obtain a dense coating layer in the inner cavity of the details of the lower limit of the ratio Fn/Faboutmust be not less than 0.3. At smaller relations in the coating formed from discontinuous layer, which does not provide reliable protection details.

The upper limit is not limited, because even when the activity of circulating the gas mixture close to 1, there is a depletion of the gas mixture due to the saturation of the surfaces of the parts and the activity of the circulating gas mixture ≈0,8.

Forming a coating on low-activation mechanism is in the ratio of Fn/Faboutfrom 0.3 to 0.7. When the activity of more than 0.7, the formation of the coating is on the active mechanism with allocation of secondary phases in the outer area of the coating and leads to an increased content of aluminum in the coating, which leads to the formation of the modified regions in the alloy framework.

When applying diffusion aluminide coverage for low-activation mechanism is formed diffusion barrier β-phase NiAl on the outer surface of the coating. Then ion-PL is zmanim method or electron-beam evaporation in vacuum on the outer surfaces of the parts put a cladding coating system MeCrAlY, where Me is Ni, Co, NiCo.

An example of a specific implementation.

Blades with a long narrow internal channels of the alloy INK cause diffusion aluminide floor the gas circulation method. Operating temperature 1000°C, application time 4 hours.

The process is carried out in a sealed volume, the items placed in the snap-apart from saturating the mixture, which is in the pan and is a source of aluminum - ferroaluminum FeAl and the activator is ammonium chloride NH4Cl. In the beginning of the process in the chamber creates a vacuum 1.33·10-1PA and produce heat up to operating temperature. As a result of decomposition of halides and subsequent disproportionation reactions in the chamber creates a pressure of 0.5·105-1,5·105PA. The resulting environment provides the process flow of eletrownia external and internal surfaces of the parts due to force of pumping.

After applying aluminide coating on the outer surface parts of ion-plasma method or electron-beam evaporation in a vacuum) is applied coating system MeCrFlY (Me-Ni, Co, NiCo). The total combined thickness of the applied coating 100 microns, including floor NiCrFlY - 60 microns.

Assessment criterion health coverage chosen depth of the modified layer alloy parts under the combined surface. In the table given the s data characterizing the properties of the combined coverage, depending on the relationship of the conditional reaction surfaces Fn/FO.

It is established that the depth of corrosion combined coating after working in tough conditions amounted to 1/3 of the thickness of the cladding layer. On the details without the combined coverage of the identified individual ulcerative lesions alloy parts.

The proposed method of applying a combined coating provides improved heat resistance and corrosion resistance of the coating that extends the life of blades of a gas turbine engine.

/table>

The method of applying a combined coating mainly on the details of heat-resistant alloys with internal channels, including drawing on external and internal surfaces of the diffusion aluminide coverage in the circulating gaseous medium, characterized in that the diffusion aluminide coating is applied on a light mechanism with respect to the reaction surfaces Fn/Fo= 0,3 a-0.7, where Fn- the total surface parts, which are coated, Fo- the total surface saturating the mixture, and then ion-plasma method or electron-beam evaporation in vacuum on the outer surfaces of the parts put a cladding coating MeCrAlY, where Me is Ni, Co, NiCo.



 

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FIELD: metallurgy, namely chemical and heat treatment of refractory alloys, possibly used for applying protective coatings onto blades of gas-turbine engines.

SUBSTANCE: method comprises steps of applying onto inner and outer surfaces of parts diffusion aluminide coating in circulating gaseous medium; applying coating in low-active system at relation of reaction surfaces Fн/Fo = 0.3 - 0.7, where Fн - total surface of parts to be coated; Fo - total surface of saturating mixture; then applying onto outer surfaces of parts cladding coating, namely MeCrAlY, where Me - Ni, Co, NiCo by ion-plasma process or electron beam evaporation in vacuum.

EFFECT: improved fire and corrosion resistance of coating, increased resource of blades of gas-turbine engine.

1 cl, 1 ex, 1 tbl

FIELD: ferrous metallurgy, possibly manufacture of processing tools for rolling tubes.

SUBSTANCE: method comprises steps of mechanically working, metal plating and heat treatment. Working surface of tool is metal plated by applying aluminum layer with thickness 0.2 - 0.8 mm. Heat treatment of tool is realized by heating it up to 900-1050°C and soaking at such temperature for 3 h in order to form diffusion layer with aluminum content 5 - 10%.

EFFECT: enhanced wear resistance of tool, improved quality of rolled tubes.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

SUBSTANCE: it is implemented coating of internal cavity of blade by carbon with saturation rate from 1.5 till 8 g/m2 by means of filling of internal cavity of blade by powder mixture or gaseous medium, heating or isolation of blade with filled internal cavity. Then it is implemented application of diffusion aluminide coating with saturation rate from 15 till 60 g/m2.

EFFECT: high-temperature coat for protection against high-temperature oxidation of internal cavity surface of turbine blade.

3 cl, 1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to method of receiving of aluminide coatings and can be used in aviation and energy turbine manufacture. Method of surface calorising of internal cavity of turbine blade from heat-resistant alloy, containing entrance channels, output slit and/or punched hole, includes preparation of powder mixture, filling of internal cavity of blade by powder mixture through entrance channels, heating of blade with powder mixture, saturation of surface of internal cavity of blade by aluminium and removing of powder mixture from internal cavity of blade. Before filling of internal cavity of blade by powder mixture output slit and/or punched hole, and entrance channels after filling by powder mixture is closed by plastic metal foil. Saturation of surface of internal cavity of blade is implemented at temperature 560-640°C no longer than 8 h. After removing of powder mixture from internal cavity of blade it is implemented heat treatment of blade in vacuum. Powder mixture contains components in a following ratio, wt %: aluminium 10-30, aluminium oxide 67-89 and activating agent NH4CI 1-3. Maximum lateral dimension of particles in powder mixture dp is selected from condition dp≤dmh/3, where dmh minimal lateral dimension of output slit on blade and/or punched holes, and in the capacity of plastic metal foil it is used foil from aluminium or nickel.

EFFECT: receiving of coating, providing overall protection of surfaces of internal cavities of blades from heat-resistant alloys.

5 cl, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: halogenide is obtained by means of a reaction between halogenide and metal donor containing aluminium; then, halogenide is carried with carrier gas to come into contact with inner wall of the blade of the above nozzle guide vanes. The above metal donor is arranged at least partially in the above cavity. The above blade includes a cavity with a hole for supply of cooling fluid medium. The above metal donor is used as a bar that is introduced through the hole for supply of cooling fluid medium and that is obtained by high-temperature sintering under pressure of metal powder containing aluminium in the quantity of 30 to 80 atm %.

EFFECT: obtaining coating of walls of inner cavities of metal parts throughout the surface and of required thickness.

6 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: invention refers to method of application of protective coating containing aluminium and zirconium and/or hafnium, to the surface of metal turbine aggregate parts. Parts processed and cementing medium out of aluminium alloy are placed into chamber and processed at 950 to 1200°C in atmosphere containing active gas. Cementing medium is made of aluminium alloy containing additionally at least one reactive element - zirconium and/or hafnium. When active gas reacts with the cementing agent, halides of aluminium and the above mentioned reactive element are produced and decomposed upon contact with parts, when the reactive element is deposited on the parts together with aluminium.

EFFECT: protection of parts operating at high temperatures from erosion and corrosion.

10 cl, 1 dwg, 2 tbl

Up!
Table
FN/FAboutThe thickness alteromonas layer, μmThe depth of the modified layer in the alloy parts, microns
the outer surfaceThe internal surface
0,2525Intermittent40-60
0,33010-20No
0,53515-30No
0,74030-40No
0,754530-5010-20