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Refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier and preparing method thereof

A refractory metal, high temperature diffusion technology, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problem of weakening the solid solution strengthening effect of solid solution elements, reducing the high temperature oxidation resistance of the coating, and shortening the coating. Layer life and other issues, to achieve excellent high-temperature structure and chemical stability, ensure high-temperature oxidation resistance, and prolong high-temperature service life.

Active Publication Date: 2019-10-25
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are significant differences in the chemical composition of the above-mentioned coatings and the refractory metal substrate, and the chemical activities of the components in the coating and the substrate are different, and interdiffusion between the coating and the substrate is inevitable during service.
On the one hand, interdiffusion leads to a large consumption of effective anti-high temperature oxidation components (Si, Al, Ir, etc.) in the coating, which greatly shortens the life of the coating. Moreover, matrix elements diffuse into the coating, causing changes in the chemical composition of the coating. , thereby reducing the high-temperature oxidation resistance of the coating; on the other hand, interfacial diffusion reactions can occur between the coating and some components in the matrix to form brittle intermetallic compound phases or topological close-packed phases, resulting in the formation of In the harmful phase area, the formation of these precipitates not only consumes the solid solution strengthening elements of the refractory metal matrix and weakens the solid solution strengthening effect of the solid solution elements, but also the precipitates are often the origin of cracks and the channels for cracks to rapidly expand, significantly Reduced creep rupture life of refractory metal substrates

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  • Refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier and preparing method thereof
  • Refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier and preparing method thereof

Examples

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Embodiment 1

[0030] The surface of the Ta12W alloy in this embodiment reacts in situ and the self-generated high-temperature diffusion barrier is located between the Ta12W alloy and the Si-Cr-Ti-Zr high-temperature protective coating coated on the surface of the Ta12W alloy, and the high-temperature chemical reaction between Si and graphene oxide The generated SiC is the main phase, and the thickness of the in-situ reaction self-generated high-temperature diffusion barrier is 10 μm.

[0031] The preparation method of the Ta12W alloy surface in-situ reaction self-generated high-temperature diffusion barrier in this embodiment includes the following steps:

[0032] Step 1. Use 600 # The surface of the Ta12W alloy is polished with SiC sandpaper, then sand blasted and pickled, and then immersed in acetone for degreasing to obtain the pretreated Ta12W alloy; the sand used for the sand blast is corundum sand, and the sand blasted The pressure is 0.8MPa, and the sandblasting time is 8min; the ac...

Embodiment 2

[0039] The in-situ reaction self-generated high-temperature diffusion barrier on the surface of the Nb521 alloy in this embodiment is located between the Nb521 alloy and the Si-Mo-Zr high-temperature protective coating coated on the surface of the Nb521 alloy, and the SiC formed by the high-temperature chemical reaction between Si and graphene As the main phase, the thickness of the in-situ reaction self-generated high-temperature diffusion barrier is 6 μm.

[0040] The preparation method of the in-situ reaction self-generated high-temperature diffusion barrier on the surface of Nb521 alloy of this embodiment comprises the following steps:

[0041] Step 1. Use 600 # The surface of the Nb521 alloy is polished with SiC sandpaper, then sand blasted and pickled, and then immersed in acetone for degreasing to obtain the pretreated Nb521 alloy; the sand used in the sand blasting is zirconia sand, and the sand blasting The pressure is 0.6MPa, and the sandblasting time is 4min; the a...

Embodiment 3

[0048] The self-generated high-temperature diffusion barrier of in-situ reaction on the surface of Mo1 in this example is located between Mo1 and the Si-Cr-Ti high-temperature protective coating coated on the surface of Mo1, mainly SiC formed by the high-temperature chemical reaction between Si and graphene oxide Phase, the thickness of the in-situ reaction self-generated high-temperature diffusion barrier is 0.5 μm.

[0049] The preparation method of the Mo1 surface in situ reaction self-generated high-temperature diffusion barrier in this embodiment includes the following steps:

[0050] Step 1. Use 600 # The surface of Mo1 is polished by SiC sandpaper, then sand blasted and pickled, then immersed in acetone for degreasing to obtain pretreated Mo1; the sand used in the sand blasting is glass beads, and the sand blasting pressure is 0.2MPa, sandblasting time is 8min; The acid solution that described pickling adopts is mixed according to the volume ratio of 7:4 by hydrofluori...

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Abstract

The invention discloses a refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier. The refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier is located between refractory metal and sintered silicide high-temperature protection coating coated on the surface of the refractory metal, and SiC serves as the main phase. The invention further discloses a preparing method of the refractory metal surface in-situ reaction self-generation high-temperature diffusion barrier. According to the method, graphene slurry or graphene oxide slurry and silicide composite suspension slurry are sequentially preset on the pre-treated refractory metal matrix surface, through sintering, the in-situ reaction self-generation high-temperaturediffusion barrier is obtained, the in-situ reaction self-generation high-temperature diffusion barrier reduces the high-temperature mutual diffusion rate between the high-temperature protection coating and the refractory metal matrix, the high-temperature oxidation resistance of the high-temperature protection coating is ensured, the high-temperature service life is prolonged, due to the in-situ reaction self-generation high-temperature diffusion barrier, the interfacial compatibility is improved, and the refractory metal-diffusion barrier-high-temperature protection coating has the good heatcycle resistance and thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of high-temperature protection of refractory metals, and in particular relates to an in-situ reaction self-generated high-temperature diffusion barrier on the surface of refractory metals and a preparation method thereof. Background technique [0002] Refractory metals have excellent high-temperature strength and toughness and good processing properties, and have been widely used in aerospace and atomic energy industries. However, there are oxidation resistance problems in the application of refractory alloys in ultra-high temperature oxidizing environments. Applying ultra-high temperature protective coatings on the surface of refractory metals can significantly improve their high-temperature oxidation resistance and prolong the high-temperature service life of refractory metals. The most widely used high-temperature protective coatings on refractory metal surfaces are silicide coatings, aluminide coatings,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 汪欣李争显杜继红李晴宇严鹏杨涛马秀芬
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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