a y 2 o 3 /cr 2 o 3 Composite gradient hydrogen barrier coating and preparation method thereof

A composite coating and coating technology, applied in the direction of chemical instruments and methods, lamination, lamination equipment, etc., can solve the problems affecting the hydrogen resistance performance of the coating, the separation of the coating and the substrate, etc., and achieve high density and thickness Controllable, excellent hydrogen barrier effect

Active Publication Date: 2018-02-02
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 this type of hydrogen barrier material has a large mismatch with the substrate. After a certain thermal shock, a large thermal stress is generated between the coating and the substrate, resulting in the separation of the coating and the substrate, which seriously affects the hydrogen barrier performance of the coating. In order to solve the above problems, researchers are looking for other hydrogen barrier coatings that are well bonded to the substrate and have a small thermal expansion coefficient as transition layers.

Method used

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  • a y <sub>2</sub> o <sub>3</sub> /cr <sub>2</sub> o <sub>3</sub> Composite gradient hydrogen barrier coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Y for the preparation of high-temperature vacuum heat collector tubes with a thickness of 0.5 μm 2 o 3 / Cr 2 o 3Composite gradient hydrogen barrier coating:

[0031] (1) Polish the inner surface of the stainless steel tube to a roughness of 1 μm;

[0032] (2) Using metal-organic chemical vapor deposition technology to prepare Cr on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; specific process parameters are: reaction source temperature 150°C; reaction time 30min; carrier gas flow rate 200ml / min.

[0033] (3) Using metal-organic chemical vapor deposition technology to prepare Y on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; the specific process parameters are: reaction source temperature 100°C; reaction time 30min; carrier gas flow rate 100ml / min.

[0034] (4) Repeat the above step (2);

[0035] (5) Repeat the above step (3).

[0036] Finally, a multilayer Y with a thickness of about 0.5 μ...

Embodiment 2

[0039] Y for the preparation of high temperature vacuum heat collecting tubes with a thickness of 1 μm 2 o 3 / Cr 2 o 3 Composite gradient hydrogen barrier coating:

[0040] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.5 μm;

[0041] (2) Using metal-organic chemical vapor deposition technology to prepare Cr on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; specific process parameters are: reaction source temperature 180°C; reaction time 60min; carrier gas flow rate 200ml / min.

[0042] (3) Using metal-organic chemical vapor deposition technology to prepare Y on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; specific process parameters are: reaction source temperature 120°C; reaction time 60min; carrier gas flow rate 150ml / min.

[0043] (4) Repeat the above step (2);

[0044] (5) Repeat the above step (3).

[0045] Finally, a multilayer Y with a thickness of about 1 μm is...

Embodiment 3

[0048] Y 2 o 3 / Cr 2 o 3 Composite gradient hydrogen barrier coating:

[0049] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.3 μm;

[0050] (2) Using metal-organic chemical vapor deposition technology to prepare Cr on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; specific process parameters are: reaction source temperature 200°C; reaction time 45min; carrier gas flow rate 200ml / min.

[0051] (3) Using metal-organic chemical vapor deposition technology to prepare Y on the inner surface of high-temperature vacuum heat collector tubes 2 o 3 Coating; specific process parameters are: reaction source temperature 160°C; reaction time 45min; carrier gas flow rate 80ml / min.

[0052] (4) Repeat the above step (2);

[0053] (5) Repeat the above step (3).

[0054] Finally, a multilayer Y with a thickness of about 0.8 μm was obtained 2 o 3 and Cr 2 o 3 Composite gradient hydrogen barrier coating.

[0055] Dete...

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Abstract

The invention relates to a Y2O3 / Cr2O3 composite gradient anti-hydrogen coating layer and a preparation method thereof. The coating layer can be applied in hydrogen permeation resistance of a high-temperature vacuum heat collecting pipe. The Y2O3 / Cr2O3 composite gradient anti-hydrogen coating layer is composed of a stainless steel pipe and a Y2O3 / Cr2O3 composite coating layer applied on the inner surface of the stainless steel pipe. The composite coating layer is prepared by a metal-organic chemical vapor deposition method; by repeated deposition of chromium oxide and yttrium oxide coating layers, the multilayered Y2O3 / Cr2O3 composite gradient anti-hydrogen coating layer with the thickness of 0.1-20 [mu]m is obtained; the coating layer is composed of a multilayer alternative structure with the innermost layer of chromium oxide and the outermost layer of yttrium oxide. The anti-hydrogen coating layer has high bonding strength with a matrix; the preparation technology is simple and the cost is low; and the anti-hydrogen performance can be enhanced by more than or equal to 150 times.

Description

technical field [0001] The present invention relates to a Y 2 o 3 / Cr 2 o 3 A composite gradient hydrogen barrier coating and a preparation method thereof, the coating can be applied to the hydrogen permeation resistance of high-temperature vacuum heat collecting tubes. Background technique [0002] The aging of the heat-carrying fluid in the solar collector tube will produce free hydrogen, which will pass through the central tube by means of osmosis, and reach the vacuum annular space between the central tube and the casing, resulting in an increase in the pressure of the annular space, which in turn will lead to heat loss in the collector tube. increase in losses. In order to ensure the vacuum in the annular space between the tubes, corresponding measures must be taken to reduce the amount of hydrogen in the vacuum annular space. To this end, the researchers proposed the use of a hydrogen barrier coating to prevent hydrogen permeation, thereby effectively controlling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B37/00
Inventor 于庆河郝雷李帅何迪杜淼刘晓鹏蒋利军
Owner GRIMAT ENG INST CO LTD
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