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Composite tritium blocking coating and preparation method thereof

A coating and tritium-blocking technology, which is applied in the field of composite tritium-blocking coatings and its preparation, can solve the problems of ceramic coatings that are difficult to sinter and compact, and achieve the effects of high production efficiency, simple and mature process, and good bonding force

Active Publication Date: 2018-10-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tritium penetration resistance factor PRF value of a single ceramic coating is much lower than its theoretical value, mainly because the heat treatment temperature of the stainless steel substrate can only be below 900 ° C, otherwise it will cause changes in the structure of the stainless steel, and this temperature Far below the sintering temperature of the ceramic coating, it is difficult to sinter the ceramic coating densely, and the voids in the ceramic coating become channels for tritium infiltration

Method used

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  • Composite tritium blocking coating and preparation method thereof
  • Composite tritium blocking coating and preparation method thereof
  • Composite tritium blocking coating and preparation method thereof

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preparation example Construction

[0037] The preferred embodiment of the present invention also provides a preparation method of the composite tritium-blocking coating as described above, the preparation method comprising the following steps:

[0038] Step 1, forming a layer of graphene film on the base layer, specifically includes the following sub-steps:

[0039] (11) The graphene solution is evenly coated on the surface of the base layer by dipping and pulling method. Specifically, after immersing the base layer in a graphene solution with a concentration of 0.01-1.0 wt % and standing for 2-10 minutes, the base layer is pulled out at a speed of 0.1-1 mm / s, and the base layer is Dry at a temperature of 50-60°C for 5-10 minutes.

[0040] (12) Repeat step (11) 5 to 50 times, then heat-treat the product of step (11) in an argon or nitrogen atmosphere for 20 to 300 minutes, and then naturally cool to room temperature to obtain a graphene film. In this embodiment, the heat treatment temperature is 500-800° C.; ...

example 1

[0049] At room temperature, after immersing the polished and cleaned stainless steel substrate in a graphene solution with a concentration of 0.01 wt% and standing for 10 minutes, the stainless steel substrate was pulled out at a speed of 0.1 mm / s, and then After the stainless steel substrate was dried at a temperature of 60° C. for 10 min, the above-mentioned dipping and pulling-drying step was repeated 50 times to form a layer of graphene film on the stainless steel substrate; after that, the graphene film coated with After the stainless steel substrate was heat-treated for 20min in Ar atmosphere, it was naturally cooled to room temperature, and the heat treatment temperature was 500°C; then, the stainless steel substrate and Pt electrode coated with graphene film were immersed in CrO 3 The concentration is 100g / L, the concentration of concentrated sulfuric acid is 1.0g / LCrO 3 - Start electroplating after the sulfuric acid solution stands for 2 minutes, the distance between ...

example 2

[0053] At room temperature, immerse the polished and cleaned stainless steel substrate in a graphene solution with a concentration of 0.1 wt% and let it stand for 2 minutes, then pull out the stainless steel substrate at a speed of 1.0mm / s and dry it at 60°C After 5 minutes, repeat the above-mentioned dipping and pulling-drying steps 5 times; after that, heat-treat the stainless steel substrate coated with graphene film under Ar atmosphere for 5 hours, then cool to room temperature naturally, and the heat-treatment temperature is 800°C; Graphene-coated stainless steel substrate and Pt electrode immersed in CrO 3 CrO with a concentration of 300g / L and a concentrated sulfuric acid concentration of 3.0g / L 3 - Start electroplating after standing in the sulfuric acid solution for 10 minutes, the distance between the two electrodes is 50mm, the electroplating temperature is 50°C, and the electroplating current is 0.8A / cm 2 , the electroplating time was 4h; the sample after electrop...

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Abstract

The invention belongs to the related technical field of coating materials and discloses a novel composite tritium resisting coating. The novel composite tritium resisting coating comprises a basal layer and further comprises a graphene thin film, a chromium sesquioxide layer and an aluminum phosphate layer, wherein the graphene thin film is formed on the basal layer; the chromium sesquioxide layer is formed on the surface, away from the basal layer, of the graphene thin film; and the aluminum phosphate layer is formed on the surface, away from the graphene thin film, of the chromium sesquioxide layer. The invention further relates to a preparation method of the above novel composite tritium resisting coating. According to the novel composite tritium resisting coating, the characteristics that graphene is large in specific surface area, good in mechanical property, high in heat conductivity and hydrogen absorption capability, and the like are utilized, and the graphene thin film, the Cr2O3 ceramic coating and the AlPO4 ceramic coating are composited so that the novel multilayer composite tritium resisting coating can be formed; and on one hand, diffusion paths of tritium in the coating are increased, on the other hand, the capacity of the coating to capture escape tritium is improved, thus, the tritium resisting property of the coating is improved, and the coating is flat and compact.

Description

technical field [0001] The invention belongs to the technical field related to coating materials, and more specifically relates to a composite tritium-blocking coating and a preparation method thereof. Background technique [0002] In a fusion reactor fueled by tritium, tritium moves in the form of interstitial atoms in cladding structural materials (mainly metal materials), which has strong diffusion ability and is prone to leakage. At the same time, tritium has certain radioactivity and strong activity, and its leakage not only causes the loss of expensive tritium fuel, but also causes serious pollution to the environment. At present, it is generally used to prepare ceramic coatings on the surface of metal substrates, that is, tritium permeable barrier coatings, to reduce the permeability of tritium in structural materials. [0003] In the study of tritium-blocking coatings, the selection of coating materials mainly focused on Cr 2 o 3 、Al 2 o 3 , Y 2 o 3 、Er 2 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/08C25D5/48C23C18/12C23C28/04
CPCC23C18/1204C23C28/042C25D3/08C25D5/48
Inventor 薛丽红严有为张航
Owner HUAZHONG UNIV OF SCI & TECH
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