The way local protection products from the gas eletrownia

 

The invention relates to chemical-thermal processing of high temperature alloys and can be used in mechanical engineering. This method involves screening of individual sections of the product by applying to the surface of a substrate ceramic and a subsequent deposition of a layer of protective metal material, characterized in that as a sublayer of ceramics put a layer of ZrO2·Y2O2thickness of 10 to 30 μm, and as the metal layer of the protective substances are complex coating system MeCrAlY, where Me - Co, Ni thickness of 50...70 μm. The technical result of the invention is to improve the reliability of local protection products from the gas eletrownia. 1 Il., 1 PL.

The invention relates to chemical-thermal processing of high temperature alloys and can be used in mechanical engineering.

There is a method of local security locking parts turbine blades when litrovyi by coating the castle the following composition: titanium dioxide - 18-22 wt.%, the titanium nitride - 14-16 wt.%, tellurium trioxide - 0.5 to 1.5 wt.%, liquid glass - the rest (and.with. THE USSR №1574677, WITH 23 8/02, 1983).

The disadvantage of this method is the complexity of applying the coating and uneven thickness obmas is ernesti.

The closest in technical essence is the way local protection products from the gas eletrownia, including the screening of individual sections of the product by applying to the surface of a substrate ceramic and subsequent deposition layer metal protective agents (U.S. patent No. 5725905, 10/04 23, 1998).

The disadvantage of this method is that the ceramic sub-layer has a greater porosity can crack the sublayer. These deficiencies can lead to aluminide coating on the surface to be protected.

The objective of the invention is to improve the reliability of the local protection products from the gas eletrownia. The technology of manufacturing of blades do not apply aluminide coating on the outer surface of the cut lock blades, this can lead to a significant decrease of the fatigue strength of the blades.

This object is achieved in that in the way that local protection products from the gas eletrownia, including the screening of individual sections of the product by applying to the surface of a substrate ceramic and a subsequent deposition of a layer of protective metal substance, and as a sublayer of ceramics put a layer Zr2·Y

It is known that to improve the heat resistance on the outer surfaces of the turbine blades causing thermal barrier coatings, which consist of two layers: the outer ceramic ZrO2·Y2About3and the inner metal NiCrAlY. Usually ceramic is applied by a plasma method or electron-beam deposition thickness of 60-200 μm. To prevent spallation of the ceramic coating is applied with a controlled porosity and distributed within the microcracks. Stabilization of ceramics 8% Y2About3increases its heat resistance, strength and fracture toughness. However, ceramics have a low adhesion to the heat-resistant Nickel alloys. This disadvantage is eliminated by applying a metal sublayer system NiCrAlY, which is characterized by high adhesion to Zirconia. Metal sublayer is applied to the surface of the workpiece by vacuum plasma technology high energy or electron-beam sputtering of alloys NiCrAlY, CoCrAlY, NiCoCrAlY thickness of 60...100 µm (N.In.Abraimov, high Temperature materials and coatings for gas turbines, M.: engineering, 1993, S. 17-61).

The proposed technical solution on the surface of the product p is - the integral coating system MeCrAlY where - Me - Ni, Co. The sublayer ceramics plays the role of the inert layer, which does not interact with the metal products at high temperatures and has low adhesion. The metal layer of protective substance ensures a snug fit of the ceramic substrate to metal products and increases its mechanical strength. When litrovyi layer metal protective agent interacts with the saturating gas environment and it is the formation of aluminide coating, the thickness of which is determined by the temperature and time of eletrownia. The metal layer of protective substance prevents the penetration of saturating gas medium to the surface of the product and the education it aluminides coverage.

The drawing shows the image of a thin section of the sample.

The way the local protection of products from the gas eletrownia implemented as follows.

For shielding a separate section of the product, for example the outer surface of the lock blades on its surface put sublayer ceramics ZrO2·Y2About3that does not interact with the metal products at high temperatures and has low adhesion.

The metal layer protective substances which provide a firm pressing of the ceramic substrate to metal products and increases its mechanical strength. When litrovyi layer metal protective agent interacts with the saturating gas environment and it is the formation of aluminide coating, the thickness of which is determined by the temperature and time of eletrownia. The metal layer of protective substance prevents the penetration of saturating gas medium to the surface of the product and the education it aluminides coverage.

The thickness of the substrate ceramic is determined by the mechanical characteristics. When the thickness of the ceramic substrate is greater than 30 μm, it may be chipping from the surface, and when the thickness of the sublayer is less than 10 μm, it has a large porosity.

The thickness of the metallic protective substances should exceed the thickness aluminides coverage. When the thickness of the metal layer less than 20 μm, it is observed a high microporosity and possible penetration of the saturating gas medium through the ceramic sublayer to the surface of the product and formation of aluminide coverage. When the gas litrovyi blade thickness aluminides coverage usually does not exceed 40...50 microns. To avoid penetration of the saturating gas medium to the surface of the product and education on it aluminide coating needs to be applied metallicheskie coatings produce eletrownia details. The protective layer after eletrownia is removed.

An example of a specific implementation.

Installation SGA/1 was processed series blades of alloy ISSN - deposited aluminide coating method of the gas eletrownia. The saturation mode: the processing time of 6 h, the temperature of 980With the periodic operation of the fan.

Series 1. The party of blades without protection (shielding) of the lock blades coated on the outer surface of the blade coating alloy PSD 2 having the following composition, wt.%: Ni - base, SG 18...22, Al 11...13, Y 0,3...0,6.

Series 2, 3, 4. The castle blades, before the gas eletrownia, inflicted protection (shielding) sublayer of ceramics ZrO2·Y2About3and then a metal layer of an alloy PSD 2.

The results of metallographic thickness control aluminide coating on the lock of the scapula and on the outer surfaces of the pen blade is shown in the table.

The fatigue limit of the blades (the castle) after 2·107test cycles were: a series of 1-80 MPa, series 2, 3, 4 - 180 MPa.

The invention improves the reliability of the local protection products from the gas eletrownia.

Claims

the lia by applying to the surface of a substrate ceramic and subsequent deposition layer metal protective substances, characterized in that as a sublayer of ceramics put a layer of ZrO2• Y2O2thickness of 10 to 30 μm, and as the metal layer of the protective substances are complex coating system MeCrAlY, where Me is Ni, Co, thickness 50...70 μm.

 

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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

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