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Method for preparing high-absorptivity and high-emissivity coating

A technology with high emissivity and absorption rate, applied in the direction of anodic oxidation, etc., can solve the problems of unfavorable spacecraft application, poor coating adhesion, easy aging and falling off, etc., and achieve the advantages of light weight, high absorption rate and high emissivity Effect

Active Publication Date: 2019-06-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the coating prepared by the existing magnesium-lithium alloy surface treatment technology has poor bonding force, instability, easy aging and falling off, low absorption rate and low emissivity, which are unfavorable for its application on spacecraft , and provide a method for preparing a coating with high absorptivity and high emissivity

Method used

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  • Method for preparing high-absorptivity and high-emissivity coating
  • Method for preparing high-absorptivity and high-emissivity coating
  • Method for preparing high-absorptivity and high-emissivity coating

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specific Embodiment approach 1

[0024] Specific Embodiment One: This embodiment is a method for preparing a high-absorption and high-emissivity coating, which is completed in the following steps:

[0025] 1. Pre-treatment of test pieces:

[0026] ①. Use 240#, 600# and 1000# water-grinding sandpaper in sequence to polish the test piece to obtain a bright surface test piece;

[0027] ②. Use distilled water to wash the bright surface of the test piece for 3 to 5 times, and then use absolute ethanol to wash the bright surface of the test piece for 3 to 5 times to obtain the treated test piece;

[0028] 2. Preparation of thermal control coating:

[0029] Pour the electrolyte solution into the stainless steel electrolytic tank, and then immerse the treated specimen in the electrolyte solution. The treated specimen is connected to the positive pole of the pulse power supply as the anode; the negative pole of the pulse power supply is connected to the stainless steel electrolytic tank as the cathode; turn on Stirr...

specific Embodiment approach 2

[0038] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the test piece described in step 1 is a magnesium-lithium alloy. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, the electrolyte is poured into the stainless steel electrolytic cell, and then the treated specimen is immersed in the electrolyte, and the processed The test piece is connected to the positive pole of the pulse power supply as the anode; the negative pole of the pulse power supply is connected to the stainless steel electrolytic cell as the cathode; the stirrer and the cooling water are turned on, and the stirring speed is 30r / min~80r / min, and the current density is 2A / dm 2 ~3A / dm 2 , The power frequency is 300Hz~600Hz, the duty ratio is 20%~30%, and the electrolyte temperature is 10℃~30℃, and the plasma electrolytic oxidation reaction is carried out for 5min~10min, and high absorption rate and high emissivity are obtained on the surface of the test piece. coating. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing a high-absorptivity and high-emissivity coating, and relates to a coating preparation method. The method aims to solve the problems that a coating prepared through an existing magnesium lithium alloy surface treatment technology is poor in binding force, instable, prone to ageing and disengaging and low in absorptivity and emissivity and application of the method to space vehicles cannot be facilitated. The method includes the steps that first, test piece pretreatment is conducted; and second, the high-absorptivity and high-emissivity thermal control coating is prepared in a silicate electrolyte system through a micro-arc oxidation method. The thermal control coating prepared through the method has high absorptivity and emissivity, and the thermal control performance is good. By adoption of the method, the high-absorptivity and high-emissivity coating can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a coating. Background technique [0002] When a satellite is in low-Earth orbit, its external thermal environment will change drastically, and the temperature fluctuation range can reach -150-150°C. In order to maintain the normal operation of its carrying equipment, ensure that the structural components and instruments of the spacecraft are in a suitable temperature range in the space environment, and maximize the service life, the spacecraft needs to be equipped with a thermal control system, and thermal control materials are important. way of realization. Magnesium-lithium alloy is the lightest alloy among engineering materials and can be used as an alternative material for lightweight components. It has excellent properties such as high specific strength, good formability, excellent vibration damping performance, and strong resistance to electromagnetic interference. The research and production of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 姚忠平李响孙秋陈昌举夏琦兴李东琦姜兆华
Owner HARBIN INST OF TECH
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