Method for forming Pt-modified NiAl+Ni3Al thermal barrier adhering layer on surface of nickel-based super alloy

A nickel-based superalloy and superalloy technology, which is applied in the field of metal surface coating, can solve the problems of excessive difference in aluminum content and martensitic transformation of the bonding layer, and achieve stable coating structure, increased life, and adhesion. good performance

Inactive Publication Date: 2011-09-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to prepare a thermal barrier coating bonding layer with higher Pt content and lower aluminum content, so as to solve the problem that the difference between the aluminum content in the bonding layer of the traditional thermal barrier coating and the aluminum content in the matrix is ​​too large, resulting in the bonding The problem of the martensitic transformation of the layer due to the rapid diffusion of aluminum into the matrix

Method used

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  • Method for forming Pt-modified NiAl+Ni3Al thermal barrier adhering layer on surface of nickel-based super alloy
  • Method for forming Pt-modified NiAl+Ni3Al thermal barrier adhering layer on surface of nickel-based super alloy

Examples

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Embodiment 1

[0025] Example 1 Select superalloy DZ417G as the substrate, cut it into 15mm×10mm×3mm sheet, use 120#, 400#, 800# and 1200# water abrasive paper to polish the surface, and then put it into In a beaker filled with acetone, use ultrasonic cleaning for twenty minutes. After taking the sample out of the beaker, rinse the acetone on the surface of the sample with clean water, rinse with absolute ethanol, and finally dry it with a hair dryer for use.

[0026] A Pt layer with a thickness of 5 μm was electroplated on the surface of the cleaned sample, and then the electroplated substrate was heat-treated at 1050 °C for 2 h.

[0027] Put the evenly mixed infiltration agent in the corundum crucible, the composition of the infiltration agent used in powder aluminization is 6wt.%Cr-Al, 2wt.%NH 4 Cl and 92wt.% Al 2 o 3 . Embedding the heat-treated Pt-plated superalloy substrate into the infiltration agent, ensuring that the superalloy substrate is basically in the center of the crucibl...

Embodiment 2

[0028] Example 2 Pt with a thickness of 7 μm was plated on the surface of the cleaned superalloy substrate, and then it was heat-treated at 1100° C. for 3 hours. The components of powder aluminizing agent are: 8wt.%Ni-Al, 2wt.%NH 4 Cl and 90 wt.% Al 2 o 3 , other processes are the same as the above-mentioned processes. figure 1 Medium Pt modified NiAl+Ni 3 Al-based thermal barrier coating bonding layer (c), located in the middle of the thermal barrier coating system, the upper part is TGO (b) layer, the upper part of TGO is ceramic layer (a), and the lower part of the bonding layer is superalloy substrate (d ).

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Abstract

The invention relates to a method for forming a Pt-modified Beta-NiAl+Gamma'-Ni3Al thermal barrier coating adhering layer on the surface of nickel-based super alloy (c). Specially speaking, the surface (a) of a coating is a Pt+Beta-NiAl phase, and the inner part (b) of the coating is a Pt-Gamma-Ni+Gamma'-Ni3Al phase Due to the double-phase structure, the problem of martensite phase transformation in the traditional thermal barrier coating adhering layer is solved as the difference between the coating and the base aluminum is larger, and the aluminum diffuses rapidly, the oxidation resistance of the coating is guaranteed and simultaneously, the adhering property of the coating and the base is combined, and compared with the traditional adhering-layer material, the adhering layer has superior advantages. In the invention, the Pt+Beta-NiAl+Gamma'-Ni3Al coating is formed in a powder embedding and aluminizing way. The specific implementation process is as follows: plating a layer of Pt on the super alloy base, then heating and diffusing the super alloy base, and finally conducting powder embedding and aluminizing on the Pt-plated base diffused uniformly, thus obtaining the coating with the structure and the phase by aluminizing control process.

Description

technical field [0001] The invention relates to a Pt-modified NiAl+Ni formed on the surface of a nickel-based superalloy 3 The invention discloses a bonding layer method of Al thermal barrier coating, which belongs to the technical field of metal surface coating. Background technique [0002] The development trend of modern aviation gas turbine engines with high thrust, high efficiency, low fuel consumption and long life makes the inlet temperature of the turbine engine continuously increase. Although the continuous development of high-temperature alloys has greatly improved their performance, the improvement is far from meeting the needs of turbine engines. Therefore, it is a very necessary and effective technology to find new cooling methods and prepare high temperature and oxidation resistant thermal barrier coatings on the surface of superalloys, so as to reduce the temperature of the superalloy substrate surface and prevent the oxidation of the substrate. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C25D3/50C25D5/50C23C10/52
Inventor 操光辉姚培培欧桃平
Owner SHANGHAI UNIV
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