a cr 2 o 3 and al 2 o 3 Composite gradient hydrogen barrier coating and its preparation method and application

A composite coating and coating technology, applied in chemical instruments and methods, coatings, lighting and heating equipment, etc., can solve problems affecting coating reliability, affecting coating material density and hydrogen barrier properties, etc. High resistance, improved hydrogen resistance, and controllable thickness

Active Publication Date: 2017-06-16
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 cr <sub>2</sub> o <sub>3</sub> and al <sub>2</sub> o <sub>3</sub> Composite gradient hydrogen barrier coating and its preparation method and application

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 collector tube to a roughness of 1 μm;

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

[0036] (3) Using metal-organic chemical vapor deposition technology to prepare Al on the inner surface of stainless steel tube 3 2 O 3 Coating; the specific process parameters are: reaction source temperature 100℃; carrier gas flow rate is 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 0.5μm is obtained 2 O 3 And Al 2 O 3 Composite gradient hydrogen barrier coating.

[0040] Determination of multi-layer Cr 2 O 3 And Al 2 O 3 The H of the composite gradient hydrogen barrier coating at 400℃ 2 Th...

Embodiment 2

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

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

[0044] (3) Using metal-organic chemical vapor deposition technology to prepare Al on the inner surface of stainless steel tube 3 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 1μm is obtained 2 O 3 And Al 2 O 3 Composite gradient hydrogen barrier coating.

[0048] Determination of multi-layer Cr 2 O 3 And Al 2 O 3 The H of the composite gradient hydrogen barrier coating at 400℃ 2 The perm...

Embodiment 3

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

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

[0052] (3) Using metal-organic chemical vapor deposition technology to prepare Al on the inner surface of stainless steel tube 3 2 O 3 Coating; the specific process parameters are: reaction source temperature 160℃; 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 0.8μm is obtained 2 O 3 And Al 2 O 3 Composite gradient hydrogen barrier coating;

[0056] Determination of multi-layer Cr 2 O 3 And Al 2 O 3 The H of the composite gradient hydrogen barrier coating at 400℃ 2 The permea...

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Abstract

The present invention relates to a Cr 2 O 3 and Al 2 O 3 Composite gradient hydrogen barrier coating, preparation method and application thereof. The composite coating consists of Cr 2 O 3 and Al 2 O 3 Composition, clad in stainless steel. The composite coating is prepared by metal-organic chemical vapor deposition method, and through repeated deposition of aluminum oxide and chromium oxide coatings, a multi-layer Cr with a thickness of about 0.1-20 μm is obtained 2 O 3 and Al 2 O 3 The composite gradient hydrogen barrier coating can be used for the hydrogen permeation barrier of stainless steel structural parts, especially the hydrogen permeation barrier of the inner tube stainless steel tube of the solar high temperature vacuum heat collector tube. The hydrogen barrier coating has high bonding strength with the substrate, simple preparation process and low cost, and the hydrogen barrier performance is improved by more than 100 times.

Description

Technical field [0001] The invention relates to a Cr 2 O 3 And Al 2 O 3 A composite gradient hydrogen barrier coating and a preparation method and application thereof. The coating can be applied to the hydrogen penetration barrier 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. The hydrogen passes through the central tube by permeation and reaches the vacuum annular space between the central tube and the casing tube, causing the pressure of the annular space to rise, which in turn causes the heat collector tube to heat up. Increase in loss. In order to ensure the vacuum in the annular gap between the tubes, corresponding measures must be taken to reduce the amount of hydrogen in the vacuum annular space. Early solutions include the use of getter materials. The disadvantage of this method is that the capacity of the getter material is limited. When the capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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