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Preparing method for 316L stainless steel surface aluminum-silicon co-permeation oxide composite tritium resisting coating

A technology of stainless steel and oxide, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of thermal mismatch between the coating and the substrate, increase the trap of tritium diffusion, and reduce the way of diffusion, etc. Achieve the effect of improving service life, good repeatability, and stable and reliable preparation process

Inactive Publication Date: 2019-09-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxide coatings have the advantages of high melting point, stable chemical properties, relatively simple preparation process and good tritium blocking performance, but at the same time there is a problem of thermal mismatch between the coating and the substrate; the tritium blocking factor of non-oxide coatings can reach 5~ 6 orders of magnitude, but titanium-based coatings TiC and TiN are easily oxidized above 450 °C, SiC and Si 3 N 4 The silicide ceramic coating has good oxidation resistance and overcomes the shortcomings of titanium-based coatings, but when the film thickness is large, it will cause cracking and peeling of the coating, which will lead to coating damage; the bonding force between the composite coating and the substrate Good, thermal fit mitigated effectively, increased traps for tritium diffusion and reduced pathways for diffusion

Method used

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  • Preparing method for 316L stainless steel surface aluminum-silicon co-permeation oxide composite tritium resisting coating
  • Preparing method for 316L stainless steel surface aluminum-silicon co-permeation oxide composite tritium resisting coating
  • Preparing method for 316L stainless steel surface aluminum-silicon co-permeation oxide composite tritium resisting coating

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of the aluminum-silicon co-permeated oxide tritium-resistant coating on the surface of 316L stainless steel in this embodiment is as follows:

[0030] 1. Pretreatment of substrate

[0031] Pass the 316L stainless steel substrate through 120 # 、320 # 、600 # , 800 # Silicon carbide sandpaper was ground and polished step by step to the mirror surface, and after ultrasonic cleaning and drying, a 316L stainless steel sample with a smooth and smooth surface was obtained;

[0032] 2. Preparation of embedding penetrating agent

[0033] The mass fractions are 30% aluminum powder, 10% silicon powder, 55% aluminum oxide and 5% sodium fluoride powder, and then put into a planetary ball mill with a rotation speed of 300 rpm for 8 hours to mix and refine. Obtain embedding agent. Among them, the purity of aluminum powder, silicon powder, aluminum oxide powder and sodium fluoride powder is not less than 99.0%.

[0034] 3. Co-infiltration of aluminum and si...

Embodiment 2

[0040] The preparation method of the aluminum-silicon co-permeated oxide tritium-resistant coating on the surface of 316L stainless steel in this embodiment is as follows:

[0041] 1. Pretreatment of substrate

[0042] Pass the 316L stainless steel substrate through 120 # 、320 # 、600 # , 800 # Silicon carbide sandpaper was ground and polished step by step to the mirror surface, and after ultrasonic cleaning and drying, a 316L stainless steel sample with a smooth and smooth surface was obtained;

[0043] 2. Preparation of embedding penetrating agent

[0044] The mass fractions are 20% aluminum powder, 20% silicon powder, 55% alumina and 5% sodium fluoride powder, and then put into a planetary ball mill with a rotation speed of 300 rpm for 8 hours to mix evenly and refine. Obtain embedding agent. Among them, the purity of aluminum powder, silicon powder, aluminum oxide powder and sodium fluoride powder is not less than 99.0%.

[0045] 3. Co-infiltration of aluminum and si...

Embodiment 3

[0051] The preparation method of the aluminum-silicon co-permeated oxide tritium-resistant coating on the surface of 316L stainless steel in this embodiment is as follows:

[0052] 1. Pretreatment of substrate

[0053] Pass the 316L stainless steel substrate through 120 # 、320 # 、600 # , 800 # Silicon carbide sandpaper was ground and polished step by step to the mirror surface, and after ultrasonic cleaning and drying, a 316L stainless steel sample with a smooth and smooth surface was obtained;

[0054] 2. Preparation of embedding penetrating agent

[0055] The mass fractions are 10% aluminum powder, 30% silicon powder, 55% aluminum oxide and 5% sodium fluoride powder, and then put into a planetary ball mill with a rotation speed of 300 rpm for 8 hours to mix and refine. Obtain embedding agent. Among them, the purity of aluminum powder, silicon powder, aluminum oxide powder and sodium fluoride powder is not less than 99.0%.

[0056] 3. Co-infiltration of aluminum and si...

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Abstract

The invention discloses a preparing method for a 316L stainless steel surface aluminum-silicon co-permeation oxide composite tritium resisting coating. An embedded dialysis method is adopted for embedding of a base material into an embedded dialysis agent, heat treatment is conducted in the inert atmosphere, and the coating is formed in the manner of diffusion. The embedded dialysis technology is adopted in the preparing method so that the service life of a 316L stainless steel structure material in the reactor environment can be effectively prolonged. The continuous and dense aluminum-silicon oxide is generated on the surface of the coating in the high-temperature environment, good tritium resisting performance is achieved, seepage to the structure materials through the tritium can be reduced, and accordingly the severe reactor conditions can be met.

Description

technical field [0001] The invention relates to a preparation method of a composite tritium-resistant coating on the surface of 316L stainless steel, in particular to a preparation method of an aluminum-silicon co-permeated oxide composite tritium-resistant coating on the surface of 316L stainless steel. Background technique [0002] In a fusion reactor using tritium as a raw material, due to the small mass and atomic radius of tritium, it has a strong diffusion ability in cladding metal structural materials, which is prone to leakage, resulting in material embrittlement, fuel loss and radioactive pollution, etc. question. In order to effectively prevent tritium penetration without sacrificing the overall performance of metal structural materials, a commonly used method is to prepare tritium-resistant coatings on the surface of metal structural materials. [0003] At present, ceramics and their composite materials are the first choice for tritium-resistant coatings. In term...

Claims

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Application Information

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IPC IPC(8): C23C12/02C23C8/12
CPCC23C8/12C23C12/02
Inventor 黄俊谢浩罗来马吴玉程刘东光昝祥朱晓勇
Owner HEFEI UNIV OF TECH