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

A composite coating and coating technology, which is applied in the direction of chemical instruments and methods, lamination, lamination devices, etc., can solve the problem of poor hydrogen barrier performance, and achieve the effects of improved hydrogen barrier performance, controllable thickness, and uniform composition

Active Publication Date: 2017-12-26
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while Cr 2 o 3 The coefficient of thermal expansion itself matches the austenitic stainless steel matrix best, but its hydrogen resistance is not as good as that of Al 2 o 3

Method used

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  • a y <sub>2</sub> o <sub>3</sub> / al <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
Comparison scheme
Effect test

Embodiment 1

[0028] Y 2 o 3 / Al 2 o 3 / Cr 2 o 3 Composite gradient hydrogen barrier coating:

[0029] (1) Polish the inner surface of the stainless steel tube to a roughness of 1 μm;

[0030] (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 120°C; carrier gas flow rate 100ml / min, Cr 2 o 3 Coating thickness is about 0.5μm;

[0031] (3) Using metal-organic chemical vapor deposition technology to deposit Cr on the inner surface of the high-temperature vacuum heat collector tube 2 o 3 On the coating, the preparation of Al 2 o 3 coating; specific process parameters are: reaction source temperature 150°C; carrier gas flow rate 200ml / min, Al 2 o 3 Coating thickness is about 2μm;

[0032] (4) Metal-organic chemical vapor deposition technology was used to deposit Al on the inner surface of high-temperature vacuum h...

Embodiment 2

[0036] Y 2 o 3 / Al 2 o 3 / Cr 2 o 3 Composite gradient hydrogen barrier coating:

[0037] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.5 μm;

[0038] (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; carrier gas flow rate 150ml / min, Cr 2 o 3 Coating thickness is about 1 μm;

[0039] (3) Using metal-organic chemical vapor deposition technology to deposit Cr on the inner surface of the high-temperature vacuum heat collector tube 2 o 3 On the coating, the preparation of Al 2 o 3 coating; specific process parameters are: reaction source temperature 180°C; carrier gas flow rate 200ml / min, Al 2 o 3 The thickness of the coating is about 4 μm;

[0040] (4) Metal-organic chemical vapor deposition technology was used to deposit Al on the inner surface of high-tempera...

Embodiment 3

[0044] Y 2 o 3 / Al 2 o 3 / Cr 2 o 3 Composite gradient hydrogen barrier coating:

[0045] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.3 μm;

[0046] (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; carrier gas flow rate 150ml / min, Cr 2 o 3 Coating thickness is about 0.8μm;

[0047] (3) Using metal-organic chemical vapor deposition technology on the inner surface of high-temperature vacuum heat collector tube, Cr 2 o 3 On the coating, the preparation of Al 2 o 3 coating; specific process parameters are: reaction source temperature 200°C; carrier gas flow rate 200ml / min, Al 2 o 3 Coating thickness is about 6μm;

[0048] (4) Using metal-organic chemical vapor deposition technology on the inner surface of high-temperature vacuum heat collector tube, Al 2 o ...

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Abstract

The invention relates to an Y2O3 / Al2O3 / Cr2O3 composite gradient hydrogen resistant coating and a preparation method thereof. The hydrogen resistant coating is used for resisting hydrogen permeation on a stainless steel structural member, especially resisting the hydrogen permeation on an inner stainless steel tube in a solar energy high-temperature vacuum collector tube. The composite gradient hydrogen resistant coating is composed of the stainless steel tube and an Y2O3 / Al2O3 / Cr2O3 composite coating which is applied on an inner surface of the stainless steel tube. The composite coating is prepared through a metal-organic chemical vapor deposition method, wherein a Cr2O3 coating, an Al2O3 coating and an Y2O3 coating are successively deposited to form the Y2O3 / Al2O3 / Cr2O3 composite gradient hydrogen resistant multilayer coating being 0.1-20 [mu]m in thickness. The hydrogen resistant coating is strong in combination strength with a substrate, is simple in preparation process and is low in cost, and is improved in hydrogen resistant performance by more than 300 times.

Description

technical field [0001] The present invention relates to a Y 2 o 3 / Al 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 ...

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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