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

A composite coating and coating technology, applied in chemical instruments and methods, lamination, lamination devices, etc., can solve the problems affecting the reliability of the coating, affecting the density and hydrogen barrier properties of the coating material, etc., to achieve compactness High, improved hydrogen resistance and controllable thickness

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

Preparation of α-Al due to high temperature chemical vapor deposition method 2 o 3 When it is relatively easy to form large particles, large particles can often form a brittle phase, which affects the reliability of the coating, and also affects the density and hydrogen barrier properties of the coating material.

Method used

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  • a y <sub>2</sub> o <sub>3</sub> / al <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 / Al 2 o 3 Composite 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 Al 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 20min; 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 20min; 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 ...

Embodiment 2

[0039] Y for the preparation of high temperature vacuum heat collecting tubes with a thickness of 1 μm 2 o 3 / Al 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 Al 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 50min; 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 50min; 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 wa...

Embodiment 3

[0048] Y 2 o 3 / Al 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 Al 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 30min; 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 30min; 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 Al 2 o 3 Composite gradient hydrogen barrier coating.

[0055] Dete...

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Abstract

The invention relates to an Y2O3 / Al2O3 composite gradient hydrogen resistant coating and a preparation method thereof. The coating is used for resisting hydrogen permeation in a high-temperature vacuum collector tube. The composite gradient hydrogen resistant coating is composed of the stainless steel tube and an Y2O3 / Al2O3 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 an Al2O3 coating and an Y2O3 coating are deposited repeatedly on the inner surface to form the multilayer Y2O3 / Al2O3 composite gradient hydrogen resistant coating being 0.1-20 [mu]m in thickness. The coating is in a multilayer alternated structure with the most inner layer being Al2O3 and the most outer layer being Y2O3. 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 200 times.

Description

technical field [0001] The present invention relates to a Y 2 o 3 / Al 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. Early solutions included the use of getter materials, which suffer from the limited capacity of the getter material, and when the capacity o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B1/08B32B15/04B32B37/00
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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