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Dispersed hydrogen barrier coating on inner wall of high temperature vacuum heat collecting tube and preparation method thereof

A vacuum heat collector tube and coating technology, applied in the field of solar thermal utilization, to achieve the effects of high bonding strength, controllable thickness, and excellent hydrogen resistance performance

Active Publication Date: 2018-02-23
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a relatively simple Al 2 o 3 / Cr 2 o 3 Diffuse hydrogen barrier coating and its preparation method, namely the simultaneous preparation of Al by dual evaporation sources on the inner surface of high temperature vacuum heat collector tube 2 o 3 / Cr 2 o 3 Diffused Hydrogen Barrier Coating

Method used

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  • Dispersed hydrogen barrier coating on inner wall of high temperature vacuum heat collecting tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Polish the inner surface of the stainless steel tube to a roughness of 1 μm;

[0027] (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 / Cr 2 o 3Diffusion coating; the reaction source adopts aluminum organic reaction source and chromium organic reaction source, and the specific process parameters are: aluminum reaction source temperature 150°C, aluminum reaction source reaction time 30min; chromium reaction source temperature 120°C, chromium reaction source reaction time 20min, Carrier gas H 2 The flow rate is 200ml / min. By controlling the heating temperature of the aluminum reaction source and the reaction time, the Al 2 o 3 become the main phase.

[0028] (3) Finally, Al with a thickness of about 0.5 μm is obtained 2 o 3 / Cr 2 o 3 Dispersion coating, in which the main phase Al 2 o 3 The content is about 70w%.

[0029] Determination of Al 2 o 3 / Cr 2...

Embodiment 2

[0031] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.5 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 / Cr 2 o 3 Diffusion coating; the reaction source adopts aluminum organic reaction source and chromium organic reaction source, and the specific process parameters are: aluminum reaction source temperature 150°C, reaction time 50min; 2 The flow rate is 200ml / min.

[0033] (3) Finally, Al with a thickness of about 1 μm is obtained 2 o 3 / Cr 2 o 3 Dispersion coating, in which the main phase Al 2 o 3 The content is about 80w%.

[0034] Determination of Al 2 o 3 / Cr 2 o 3 Diffusion coating at 400°C H 2 Permeability, hydrogen barrier performance increased by 250 times.

Embodiment 3

[0036] (1) Polish the inner surface of the stainless steel tube to a roughness of 0.3 μm;

[0037] (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 / Cr 2 o 3 Diffusion coating; the reaction source adopts aluminum organic reaction source and chromium organic reaction source, and the specific process parameters are: aluminum reaction source temperature 200°C, reaction time 60min; 2 The flow rate is 200ml / min.

[0038] (3) Finally, Al with a thickness of about 3 μm is obtained 2 o 3 / Cr 2 o 3 Dispersion coating, in which the main phase Al 2 o 3 The content is about 90w%.

[0039] Determination of Al 2 o 3 / Cr 2 o 3 Diffusion coating at 400°C H 2 Permeability, hydrogen barrier performance increased by 300 times.

[0040] Al of the present invention 2 o 3 / Cr 2 o 3 The dispersion coating is prepared by the metal-organic chemical vapor deposition method. By deposi...

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Abstract

The invention relates to a diffused hydrogen barrier coating on the inner wall of a high-temperature vacuum heat collecting tube and a preparation method thereof, belonging to the technical field of solar thermal utilization. The hydrogen barrier coating is composed of a stainless steel pipe and an Al2O3 / Cr2O3 dispersion coating applied on the inner surface of the stainless steel pipe. The Al2O3 / Cr2O3 dispersion coating is prepared by the metal-organic chemical vapor deposition method. By depositing alumina and chromium oxide coatings at the same time, a hydrogen barrier with alumina as the main phase and chromium oxide dispersed in the main phase is formed on the inner surface of the stainless steel. coating. The Al2O3 / Cr2O3 diffused hydrogen barrier coating with a thickness of about 0.1-20 μm can be obtained by using this method. 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 diffused hydrogen barrier coating on the inner wall of a high-temperature vacuum heat collecting tube and a preparation method thereof. The method is mainly applied to Al 2 o 3 / Cr 2 o 3 The preparation of the diffused hydrogen barrier coating belongs to the technical field of solar photothermal utilization. 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 material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04C23C16/40
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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