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A preparation method of waveguide bright anodic oxidation thermal control coating

A technology of anodic oxidation and thermal control coating, which is applied in the field of spacecraft to achieve the effect of continuous coating, high product qualification rate and good quality consistency

Active Publication Date: 2021-07-02
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the thermal control requirements of a certain satellite mission and the structural characteristics of the SAR antenna, the general coating method cannot meet the requirements at all.

Method used

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  • A preparation method of waveguide bright anodic oxidation thermal control coating
  • A preparation method of waveguide bright anodic oxidation thermal control coating
  • A preparation method of waveguide bright anodic oxidation thermal control coating

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0034] A satellite SAR antenna waveguide (radiating element) is taken as an example for illustration. The satellite SAR antenna waveguide is formed by machining and brazing of multiple aluminum-manganese aluminum alloy thin-walled parts. The structure is complex and the precision is high. Its local shape is as follows: figure 1 shown. The thermal control design requirements of the waveguide in this embodiment are: bright anodic oxidation thermal control coating treatment is carried out on the surface except the inner wall of the bell mouth and the inner cavity, and the solar absorption ratio of the thermal control coating is required to be α s =0.23±0.02, hemispherical emissivity ε H =0.43±0.02.

[0035] The front of the antenna waveguide has multiple rows of front-en...

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Abstract

The invention discloses a preparation method of a waveguide bright anodic oxidation thermal control coating. The preparation method comprises: chemically polishing the surface of a target waveguide; covering and protecting a predetermined area of ​​the target waveguide; The target waveguide is subjected to sulfuric acid anodic oxidation; the anodized target waveguide is placed in an alkaline solution for neutralization; and deionized water at a predetermined temperature is used to seal the target waveguide. The invention adopts multiple protective measures combining deionized water perfusion in the inner cavity, sealing the bell mouth with a silica gel plug, and coating with peelable paint, so as to improve the performance of the waveguide. The thermal control coating prepared by the present invention has good quality consistency, has little influence on the waveguide performance index, and has a product pass rate as high as 98% or more; in addition, the thermal control coating prepared by the present invention has good spatial stability and can be used in the entire life cycle of a spacecraft. Medium solar absorption ratio α s and the hemispherical emissivity ε H The change values ​​are not greater than 0.02.

Description

technical field [0001] The invention relates to the field of spacecraft, in particular to a surface treatment method for waveguides used in spaceflight. Background technique [0002] Space is a special high-vacuum environment. When a spacecraft is operating in space and is irradiated by the sun and not irradiated by the sun, the temperature difference can reach hundreds of degrees. In order to ensure the normal operation of the spacecraft in the harsh high-vacuum, high-low temperature alternating environment, all the loads and equipment on the spacecraft must be kept in a relatively constant temperature range, and the harsh space environment will affect the normal operation of the spacecraft. It has brought great challenges, and it is necessary to carry out a reasonable thermal control design for the spacecraft and develop a reliable thermal control system. [0003] As a passive thermal control technology, bright anodic oxidation thermal control coating is often used to adj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/16C25D11/24C23F3/03
CPCC23F3/03C25D11/022C25D11/08C25D11/16C25D11/246
Inventor 侯彬许建伟陈旭王伟
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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