Chromium oxide and alumina composite coating and preparation method thereof

A technology of composite coating and alumina, applied in the direction of coating, metal material coating process, layered products, etc., can solve the problems of high cost and complicated preparation process, achieve improved thermophysical matching performance, and improve thermal cycle use performance effect

Inactive Publication Date: 2015-06-17
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Al or Fe / Al alloy layer and the aluminum oxide hydrogen permeable composite coating have the above advantages, the preparation of the Al or Fe / Al alloy layer involves metal layer coating and high-temperature post-treatment, and the preparation process is complicated and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A single-layer chromium oxide / alumina composite coating was deposited on 316L stainless steel by metal-organic chemical vapor deposition. Using chromium acetylacetonate and aluminum acetylacetonate as metal precursors, H 2 As a carrier gas, H 2 O as a reactive gas. The volatilization temperature of chromium acetylacetonate is 140 ° C, through the H of chromium acetylacetonate 2 The carrier gas flow rate was 30 sccm. The volatilization temperature of aluminum acetylacetonate is 120 ° C, through the H of aluminum acetylacetonate 2 The carrier gas flow rate was 10 sccm. h 2 O at a constant temperature of 25°C, through H 2 O of H 2 The flow rate is 10 sccm. Chromium acetylacetonate and aluminum acetylacetonate with H 2 O reacted in the reaction chamber, the deposition temperature was 500°C, the deposition time was 1 hour, and the pressure of the reaction chamber was 1600Pa. The thickness of the obtained single-layer chromium oxide / alumina composite coating is 1.3 ...

Embodiment 2

[0021] Deposition of multi-layer gradient chromium oxide / alumina composite coatings on 304 stainless steel by metal-organic chemical vapor deposition. Using chromium acetylacetonate and aluminum acetylacetonate as metal precursors, H 2 As a carrier gas, H 2 O as a reactive gas. The volatilization temperature of chromium acetylacetonate is 150 ° C, through the H of chromium acetylacetonate 2 The carrier gas flow rate was 30 sccm. The volatilization temperature of aluminum acetylacetonate is 120 ° C, through the H of aluminum acetylacetonate 2 The carrier gas flow rate was 10 sccm. h 2 O at a constant temperature of 25°C, through H 2 O of H 2 The flow rate is 10 sccm, the deposition temperature is 500° C., the deposition time is 0.5 hour, and the reaction chamber pressure is 1600 Pa. By changing the volatilization temperature of chromium acetylacetonate and aluminum acetylacetonate and H 2 The carrier gas flow rate is used to adjust the composition ratio of chromium oxi...

Embodiment 3

[0023] Deposition of multilayer gradient chromium oxide / alumina composite coatings on 316L stainless steel by metal-organic chemical vapor deposition. Using chromium acetylacetonate and aluminum acetylacetonate as metal precursors, H 2 As a carrier gas, H 2 O as a reactive gas. The volatilization temperature of chromium acetylacetonate is 140 ° C, through the H of chromium acetylacetonate 2 The carrier gas flow rate was 30 sccm. The volatilization temperature of aluminum acetylacetonate is 120 ° C, through the H of aluminum acetylacetonate 2 The carrier gas flow rate was 10 sccm. h 2 O at a constant temperature of 25°C, through H 2 O of H 2 The flow rate is 10 sccm, the deposition temperature is 500° C., the deposition time is 0.4 hour, and the reaction chamber pressure is 1600 Pa. By changing the volatilization temperature of chromium acetylacetonate and aluminum acetylacetonate and H 2The carrier gas flow rate is used to adjust the composition ratio of chromium oxid...

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Abstract

The invention relates to a chromium oxide and alumina composite coating and a preparation method thereof. The coating can be used to prevent hydrogen from penetrating into a structural material or device in the hydrogen related field. The composite coating is composed of chromium oxide and / or alumina, and is loaded on a substrate. The composite coating can be a single-layer composite coating or a multi-layer gradient composite coating. The single-layer composite coating is composed of chromium oxide and alumina. The multi-layer gradient composite coating is composed of at least two xCr2O<3-(1-x)>Al2O3 composite layers, wherein the x is the mass percentage of Cr2O3 and varies gradually. The composite coating combines the hydrogen penetration resistant performances of a chromium oxide layer and an alumina layer, and has the characteristics of simple preparation technology and excellent hydrogen penetration resistant performance.

Description

technical field [0001] The invention relates to a composite coating of chromium oxide and aluminum oxide and a preparation method thereof. The composite coating can be applied to prevent hydrogen penetration of structural materials and devices in the field of hydrogen. Background technique [0002] Hydrogen permeation barrier coating is a type of coating material that can reduce and block the hydrogen permeation of structural components, and is a key material in the field of hydrogen and hydrogen isotope applications. In recent years, fusion reactor technology, as one of the development directions to solve the future energy crisis, has received widespread attention from all over the world. The first-generation fusion reactor uses deuterium-tritium as fuel. At the working temperature, the radioactive hydrogen isotope tritium has serious penetration in the first wall, the breeding cladding, and the pipeline of the fuel circulation system, resulting in a reduction in the econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04C23C14/08C23C14/35C23C16/40
CPCB32B9/04C23C14/08C23C14/35C23C16/40
Inventor 李帅何迪刘晓鹏于庆河张超吕琴丽王树茂蒋利军
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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