Aluminum/aluminum oxide composite hydrogen resistance coating layer

A kind of aluminum oxide and hydrogen resistance technology, which is applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems of large difference in thermal expansion coefficient and reduce hydrogen resistance penetration performance, so as to reduce thermal expansion mismatch and improve Thermal shock resistance and high bonding strength

Inactive Publication Date: 2019-07-02
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal expansion coefficient of Al or FeAl alloy and alumina is very different, and the surface alumina film is easily cracked and peeled off under the impact of cold and heat, which reduces its original hydrogen permeation resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Deposition of an aluminum / alumina composite coating on 316 stainless steel. The metal aluminum target and the alumina target are respectively used. The aluminum target is powered by a DC power supply, the alumina target is powered by a radio frequency power supply, and Ar is used as the glow gas. When the back vacuum is better than 2×10 -4 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. The aluminum / alumina composite thin film was obtained by sputtering aluminum target and alumina target at the same time. for 2 hours.

[0016] The aluminum content in the obtained composite coating was 85wt%, and the hydrogen permeation performance test was carried out on the obtained composite coating sample, and the hydrogen permeation reduction factor of the composite coating to 316 stainless steel was 133 at 600°C.

Embodiment 2

[0018] Deposition of an aluminum / alumina composite coating on 304 stainless steel. The metal aluminum target and the alumina target are respectively used. The aluminum target is powered by a DC power supply, the alumina target is powered by a radio frequency power supply, and Ar is used as the glow gas. When the back vacuum is better than 2×10 -4 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. The aluminum / alumina composite thin film was obtained by sputtering the aluminum target and the alumina target at the same time. for 2 hours.

[0019] The aluminum content in the obtained composite coating was 60wt%, and the hydrogen permeation performance test was carried out on the obtained composite coating sample, and the hydrogen permeation reduction factor of the composite coating to 316 stainless steel at 600°C was 230.

Embodiment 3

[0021] Deposition of aluminum / alumina composite coatings on CLAM martensitic stainless steel. The metal aluminum target and the alumina target are respectively used. The aluminum target is powered by a DC power supply, the alumina target is powered by a radio frequency power supply, and Ar is used as the glow gas. When the back vacuum is better than 2×10 -4 After Pa, clean with Ar plasma bombardment for 15 min in the sputtering chamber. The aluminum / alumina composite thin film was obtained by sputtering aluminum target and alumina target at the same time. for 3 hours.

[0022] The aluminum content in the obtained composite coating was 43wt%. The hydrogen permeation performance test was carried out on the obtained composite coating sample. The hydrogen permeation reduction factor of the composite coating to 316 stainless steel at 600°C was 262.

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PUM

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Abstract

The invention discloses an aluminum / aluminum oxide composite hydrogen resistance coating layer. The hydrogen resistance coating layer is a single-layer coating layer which is formed on a metal substrate and composed of xAl-(1-x)Al2O3, wherein x is larger than 0 and smaller than 1. The metal substrate is made of austenitic stainless steel or martensitic stainless steel. The hydrogen resistance coating layer is prepared through a physical vapor deposition method, a magnetron sputtering method is preferred, and the hydrogen resistance coating layer is obtained by conducting sputtering on an aluminum target and an aluminum oxide target at the same time. Combination between the aluminum / aluminum oxide composite hydrogen resistance coating layer and the metal substrate is combination between metal and metal, and the combination strength is high; compared with the coefficient of thermal expansion of a metal aluminum layer, the coefficient of thermal expansion of the hydrogen resistance coating layer is lower, thermal expansion mismatching between the hydrogen resistance coating layer and a surface aluminum oxide film is reduced, and the cold and heat impact preventing performance of the hydrogen resistance coating layer is improved; and under the condition that the surface aluminum oxide film is broken, a new aluminum oxide film can be generated in situ.

Description

technical field [0001] The invention relates to an aluminum / alumina composite hydrogen barrier coating, which belongs to the field of inorganic membrane materials and applications. Background technique [0002] Stainless steel is a commonly used structural material in the field of hydrogen. The diffusion and penetration of hydrogen in stainless steel has become a problem that cannot be ignored. Hydrogen permeation will cause hydrogen embrittlement of structural materials and reduce the service life of materials. In order to improve the hydrogen permeation resistance of stainless steel, a coating with hydrogen permeation resistance can be prepared on the surface of stainless steel as a hydrogen barrier coating. In recent years, ceramic coatings with hydrogen permeation resistance have received widespread attention, such as Al 2 o 3 , ZrO 2 、Cr 2 o 3 、Er 2 o 3 , SiC, etc. Among them, Al 2 o 3 It has become an ideal coating material with its excellent hydrogen permeat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/35
CPCC23C14/0688C23C14/352
Inventor 李帅何迪张华吕琴丽王树茂刘晓鹏蒋利军
Owner GRIMAT ENG INST CO LTD
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