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Cr2O3 and Al2O3 complex gradient hydrogen resistant coating and preparation method and application thereof

A composite coating and coating technology, which is applied in chemical instruments and methods, coatings, lighting and heating equipment, etc., can solve the problems affecting the density and hydrogen barrier performance of coating materials, and affect the reliability of coatings, etc., to achieve compactness High performance, improved hydrogen barrier performance, and excellent hydrogen barrier performance

Active Publication Date: 2015-05-27
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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  • Cr2O3 and Al2O3 complex gradient hydrogen resistant coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Polish the inner surface of the martensitic stainless steel tube 3 of the high-temperature vacuum heat collecting tube to a roughness of 1 μm;

[0035] (2) Preparing Cr on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; the specific process parameters are: reaction source temperature 150°C; carrier gas flow rate 200ml / min;

[0036] (3) Prepare Al on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; specific process parameters are: reaction source temperature 100°C; carrier gas flow rate 100ml / min;

[0037] (4) Repeat the above step (2);

[0038] (5) Repeat the above step (3);

[0039] Finally, a multilayer Cr with a thickness of about 0.5 μm is obtained 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating.

[0040] Determination of multilayer Cr 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating a...

Embodiment 2

[0042] (1) Polish the inner surface of the austenitic stainless steel tube 3 of the high-temperature vacuum heat collecting tube to a roughness of 0.5 μm;

[0043] (2) Preparing Cr on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; specific process parameters are: reaction source temperature 180°C; carrier gas flow rate 200ml / min;

[0044] (3) Prepare Al on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; the specific process parameters are: reaction source temperature 120°C; carrier gas flow rate 150ml / min;

[0045] (4) Repeat the above step (2);

[0046] (5) Repeat the above step (3);

[0047] Finally, a multilayer Cr with a thickness of about 1 μm is obtained 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating.

[0048] Determination of multilayer Cr 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating at...

Embodiment 3

[0050] (1) Polish the inner surface of the austenitic stainless steel tube 3 of the high-temperature vacuum heat collecting tube to a roughness of 0.3 μm;

[0051] (2) Preparing Cr on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; specific process parameters are: reaction source temperature 200°C; carrier gas flow rate 200ml / min;

[0052] (3) Prepare Al on the inner surface of the stainless steel tube 3 by metal-organic chemical vapor deposition technology 2 o 3 Coating; specific process parameters are: reaction source temperature 160°C; carrier gas flow rate 80ml / min;

[0053] (4) Repeat the above step (2);

[0054] (5) Repeat the above step (3);

[0055] Finally, a multilayer Cr with a thickness of about 0.8 μm is obtained 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating;

[0056] Determination of multilayer Cr 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating at 40...

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Abstract

The invention relates to a Cr2O3 and Al2O3 complex gradient hydrogen resistant coating and a preparation method and an application thereof. The complex coating is composed of Cr2O3 and Al2O3, and coats stainless steel. The complex coating is prepared by a metal-organic chemical vapor deposition method. By recurrent deposition of aluminium oxide and chromium oxide coatings, a multilayered Cr2O3 and Al2O3 complex gradient hydrogen resistant coating of 0.1-20 microns thick is obtained. The hydrogen resistant coating can be used in hydrogen permeation resistance of a stainless steel structural component. The hydrogen resistant coating has high bonding strength with a matrix; the preparation technology is simple and cost is low; and hydrogen resistance can be enhanced by more than 100 times.

Description

technical field [0001] The present invention relates to a Cr 2 o 3 and Al 2 o 3 Composite gradient hydrogen barrier coating and its preparation method and application, the coating can be applied to 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 ca...

Claims

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Application Information

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IPC IPC(8): B32B15/04B32B9/04C23C16/40F24J2/48
CPCF24S70/10B32B9/04B32B15/04C23C16/40Y02E10/40F24S70/25F24S70/225
Inventor 于庆河郝雷李帅何迪王笑静杜淼蒋利军刘晓鹏
Owner GRIMAT ENG INST CO LTD
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