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High temperature resistant protective coating without affecting the mechanical properties of superalloy matrix and its preparation

A technology of protective coating and superalloy, applied in metal material coating process, coating, ion implantation plating, etc., can solve the problems of ceramic thermal expansion coefficient and other problems, achieve good anti-stripping performance and prevent interdiffusion effect

Active Publication Date: 2018-09-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of anti-stripping performance of ceramic diffusion barriers, we should mainly start from improving the interface bonding force, because it is difficult to control the thermal expansion coefficient of ceramics

Method used

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  • High temperature resistant protective coating without affecting the mechanical properties of superalloy matrix and its preparation
  • High temperature resistant protective coating without affecting the mechanical properties of superalloy matrix and its preparation
  • High temperature resistant protective coating without affecting the mechanical properties of superalloy matrix and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Vacuum smelting casting target material Ni-25Cr-10Al-0.5Y-0.5Si-0.5Hf (wt.%), processed into a flat target; using magnetron sputtering method to deposit NiCrAlYSiHf coating on the surface of nickel-based superalloy K417G parts, coating The layer thickness is about 30μm, and the grain size is less than 20nm; vacuum annealing is carried out at 1000℃×2h. Carry out a water quenching test on the coated parts (1000°C for a sufficient time to heat the parts thoroughly; then put the parts into deionized water, the water temperature is 15°C to 35°C, and the water volume is sufficient so that the temperature rise of the parts does not exceed 30°C; when the temperature of the parts is the same as that of the water, take out the parts and dry them with dry hot air for 1 cycle). After 100 cycles of testing, the surface coating of the parts did not crack or peel off. An anatomical analysis of the parts revealed that the coating / substrate interface formed dense and firmly bonded Cr d...

Embodiment 2

[0032] The preparation method is the same as in Example 1. Oxidation test (1000°C×40h) was carried out on the coated parts. An anatomical analysis of the parts revealed that the dense and firmly bonded Cr 23 C 6 The diffusion barrier, did not crack during the test. A Cr-poor region appears on the side of the coating near the diffusion barrier, such as image 3, indicating that the formation mechanism of the diffusion barrier is: Cr in the coating diffuses to the coating / substrate interface, and forms Cr with C in the substrate. 23 C 6 Floor. Cr 23 C 6 The Al content in the layer is extremely low, indicating that it is difficult for Al to pass through the diffusion barrier.

Embodiment 3

[0034] Vacuum melting cast coating target material Ni-30Cr-6Al-0.4Y-0.1Ce-0.1Dy (wt.%), processed into a flat target; vacuum melting casting alloy target material Ni-10Co-9Cr-7W-5Al-0.1Ti -0.3C (wt.%), processed into a flat target; use magnetron sputtering method to deposit Ni-10Co-9Cr-7W on the surface of nickel-based superalloy Ni-10Co-9Cr-7W-5Al-0.1Ti-0.01C parts -5Al-0.1Ti-0.3C nanocrystalline layer with a thickness of 5 μm and a grain size of less than 20 nm; then deposit a nanocrystalline NiCrAlYCeDy coating with a thickness of about 30 μm and a grain size of less than 20 nm by magnetron sputtering. Conduct oxidation test at 1000℃×300h. An anatomical analysis of the parts revealed that the dense and firmly bonded Cr 23 C 6 The diffusion barrier, did not crack during the test. Cr 23 C 6 The Al content in the layer is extremely low, indicating that it is difficult for Al to pass through the diffusion barrier.

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Abstract

The invention provides a high temperature resistant protective coating for reacting by means of spontaneous thermodynamics to generate a Cr23C6 ceramic diffusion barrier automatically in situ. The high temperature resistant protective coating is characterized by comprising a Cr23C6 phase interlayer and an MCrAlX surface layer, wherein M is Ni and / or Co, X is one or more of Hf, Si, Zr, a rare earth element and mischmetal, the rare earth element is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu or Y, and the mischmetal comprises two or more rare earth elements, which are used synchronously; and the content of Cr in the MCrAlX surface layer is 25%-40%, the content of Al in the MCrAlX surface layer is 5%-15%, and the content of X in the MCrAlX surface layer is 0.05%-1.5%. The protective coating is high in antistrip performance, can reduce the possibility that Al in the coating diffuses to the matrix, and prevents the mechanical property deterioration due to mutual diffusion.

Description

technical field [0001] The invention belongs to the field of metal high-temperature protection, and particularly provides a high-temperature-resistant protective coating that does not affect the mechanical properties of a high-temperature alloy matrix and a preparation method thereof. Background technique [0002] Many parts work in high temperature environment, such as gas turbine blades and so on. Coating high temperature resistant protective coating on the surface of parts can improve the service life of parts and avoid early damage. [0003] Commonly used high-temperature protective coatings are MCrAlY (where M=Ni, Co or a combination thereof) and aluminized coatings. When the working temperature is lower than 1000°C, the above-mentioned coating can provide good high-temperature protection performance without affecting the mechanical properties of the matrix. However, under higher working temperature conditions, the interdiffusion between the coating and the substrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/14C23C14/06
Inventor 朱圣龙任盼王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI