Composite aluminum oxide /erbium hydrogen resistance coating and preparation thereof

A composite alumina and composite coating technology, applied in coatings, metal material coating processes, gaseous chemical plating, etc., can solve problems affecting the density and hydrogen resistance of coating materials, high price, and affecting coating reliability. and other problems, to achieve the effect of improving the anti-hydrogen isotope diffusion performance, improving the particle characteristics, and improving the self-healing ability.

Active Publication Date: 2009-07-01
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that, in the high temperature preparation of α-Al by chemical vapor deposition method 2 O, it is easier to form large particles, and large particles can often form a brittle phase, which affects the reliability of the coating; it also affects the density and hydrogen barrier properties of the coating material
Er 2 o 3 Coating is a relatively new hydrogen barrier coating material, which has the advantages of high insulation resistivity, good self-healing performance, and the preparation temperature is lower than that of α-Al 2 o 3 , the disadvantage is that the price is relatively high

Method used

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  • Composite aluminum oxide /erbium hydrogen resistance coating and preparation thereof
  • Composite aluminum oxide /erbium hydrogen resistance coating and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] First, on the base material of the liquid cladding, China Low Activation Matensitic Steel (CLAM), a Fe-Al metal transition layer is deposited by chemical vapor deposition (CVD). Using FeCl 3 and AlCl 3 As a precursor, steam treated at 500 °C (the molar ratio of Fe and Al is 1:1) and H 2 / Ar gas (H 2 accounted for 75%, Ar gas accounted for 1%) reacted in the reaction chamber of the CVD equipment, the deposition temperature was 600°C, and the chamber pressure was 300Pa. The obtained metal transition layer has a thickness of 2 μm.

[0037] Subsequently, Al was prepared on top of the metal transition layer 2 o 3 -Er 2 o 3 Composite coating. The preparation method of the composite coating is to use CVD equipment to pass 450°C AlCl into the reaction chamber 3 and Er-(tmhd) 3 Steam, Al / Er element molar ratio is 1 / 1. Simultaneously inject mixed gas O 2 / H 2 / Ar (where H 2 Accounting for 75% of the total air pressure, Ar gas accounts for 1% of the total air pressur...

Embodiment 2

[0042] Multilayer gradient composite coatings were prepared by CVD method on Chinese low activity martensitic steel (CLAM). Except for the steam composition containing metal elements, the CVD preparation conditions are basically the same as in Example 1.

[0043] The prepared coating structure is as attached figure 2 As shown, where 1 is the base material CLAM steel; 2 is the metal transition layer prepared on the base material, with a thickness of 2 μm FeAl layer; 3 is Al 2 o 3 Coating; 4 is xAl in molar ratio x=0.5 2 o 3 -(1-x)Er 2 o 3 Composite coating; 5 is Er 2 o 3 Coating; the thickness of each coating of 3 to 5 is 3 μm.

[0044] After the prepared coating samples were subjected to multiple cooling and heating cycles from room temperature to 500 °C, the bonding between the coating, the transition layer and the substrate was firm without falling off.

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Abstract

The invention relates to a hydrogen resistant coating and a preparation method thereof, in particular to a hydrogen resistant coating containing an Al2O3Er2O3 composite structure. The coating comprises a basal body, a metal transition layer and an Al2O3Er2O3 composite coating arranged in sequence, wherein the basal body can be made of activated martensite steel; the metal transition layer can be made of FeAl alloy; and the composite coating can be divided into two forms of a single-layer composite coating and a multi-layer gradient composite coating according to different compositions and structures, wherein the single-layer composite coating is formed by preparing a coating on the metal transition layer, the component of the single-layer composite coating is xAl2O3-(1-x)Er2O3, the single-layer composite coating is composited according to the ratio more than 0 and less than 100 percent, the multi-layer gradient composite coating is formed by a plurality of layers of composite coating comprising xAl2O3-(1-x)Er2O3 (x is more than or equal to 0 and less than or equal to 100 percent) with different x values.

Description

technical field [0001] The invention relates to a hydrogen barrier coating system, especially containing Al 2 o 3 / Er 2 o 3 Hydrogen barrier coating system of composite structure. Background technique [0002] Hydrogen-resistant coating materials are usually used in thermonuclear experimental reactors, and their role is to prevent tritium penetration, such as ensuring safe tritium levels in the environment and coolant in the liquid cladding system, preventing tritium from breeding agent to coolant, from Penetration into the environment from the pipeline. Its structure usually includes parts such as substrate and coating material. For the design requirements of the hydrogen barrier coating material, it is necessary to meet the operation requirements of the system in the following aspects: good insulation resistivity, good hydrogen barrier performance, and good thermal expansion matching between the coating material itself and the substrate, so that after cold Under the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/40
Inventor 李弢古宏伟汤梅杨旭东巨新
Owner GRIMAT ENG INST CO LTD
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