Aluminum alloy surface wear-resistant thermal control coating and preparation method thereof

A technology of aluminum alloy surface and thermal control coating, applied in the field of wear-resistant thermal control coating and its preparation, and the field of wear-resistant thermal control coating on aluminum alloy surface and its preparation, which can solve problems such as wear resistance

Active Publication Date: 2022-01-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above problems, the present invention proposes an aluminum alloy surface wear-resistant thermal control coating and its preparation method to solve the problems of wear resistance and thermal control of the orbital mechanism of the Mars probe, the external structure of the spacecraft, and the aluminum alloy parts of the mechanism.

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  • Aluminum alloy surface wear-resistant thermal control coating and preparation method thereof
  • Aluminum alloy surface wear-resistant thermal control coating and preparation method thereof

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Embodiment 1

[0040] Take an aluminum alloy test piece with a size of 60×60mm. After the pretreatment process, the electrolyte solution is prepared according to the following mass and volume ratio: sodium aluminate 2g / L, sodium phosphate 5g / L, potassium hydroxide 5g / L, and the solvent is water. Place the aluminum alloy test piece in the electrolyte and connect it to one electrode of the power supply, and connect the other electrode of the power supply to the stainless steel electrolytic cell. AC pulse power supply is used, the frequency of the power supply is 50Hz, and the forward current density is 8A / dm 2 , the negative current density is 4A / dm 2 , processing time 90min. The resulting thermal control coating has a solar absorption ratio of 0.40, a hemispherical emissivity of 0.83, and a coating microhardness of 1600HV.

Embodiment 2

[0042] Take an aluminum alloy test piece with a size of 60×60mm. After the pretreatment process, prepare the electrolyte according to the following mass and volume ratio: sodium aluminate 8g / L, potassium pyrophosphate 5g / L, potassium hydroxide 5g / L, solvent for water. Put the aluminum alloy test piece in the electrolyte and connect it to one electrode of the power supply, and connect the other electrode of the power supply to the stainless steel plate. AC pulse power supply is used, the frequency of the power supply is 200Hz, and the forward current density is 15A / dm 2 , The negative current density is 10A / dm 2 , processing time 120min. The solar absorption ratio of the generated thermal control coating is 0.43, the hemispherical emissivity is 0.84, and the microhardness of the coating is 1700HV.

Embodiment 3

[0044] Take an aluminum alloy test piece with a size of 60×60mm, and after the pretreatment process, prepare an electrolyte according to the following mass and volume ratio: sodium aluminate 12g / L, sodium dihydrogen phosphate 5g / L, sodium hydroxide 5g / L, The solvent is water. Put the aluminum alloy test piece in the electrolyte and connect it to one electrode of the power supply, and connect the other electrode of the power supply to the stainless steel plate. AC pulse power supply is adopted, the frequency of the power supply is 60Hz, and the forward current density is 10A / dm 2 , The negative current density is 11A / dm 2 , processing time 180min. The generated thermal control coating has a solar absorption ratio of 0.42, a hemispherical emissivity of 0.83, and a coating microhardness of 1600HV.

[0045] Depend on figure 1 It can be seen that the coating is mainly composed of α-alumina. α-alumina is commonly known as corundum, its hardness is second only to diamond and cub...

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Abstract

The invention discloses an aluminum alloy surface wear-resistant thermal control coating and a preparation method of the aluminum alloy surface wear-resistant thermal control coating. The preparation method comprises the steps that an aluminum alloy base material is placed in an electrolyte containing aluminate, the alternating-current pulse current is applied to the aluminum alloy base material to conduct plasma electrolytic oxidation so that the wear-resistant thermal control coating can be formed on the surface of the aluminum alloy base material, wherein the phase structure of the wear-resistant thermal control coating comprises 80wt%-90wt% of alpha-aluminum oxide and 10wt%-20wt% of gamma-aluminum oxide.

Description

technical field [0001] The invention relates to a wear-resistant thermal control coating on the surface of an aluminum alloy and a preparation method thereof, in particular to a wear-resistant thermal control coating used for an aluminum alloy part of a Mars probe track mechanism and a preparation method thereof, belonging to a spacecraft thermal control coating The field of coating technology. Background technique [0002] Mars is the closest planet to the Earth in the solar system, and its natural environment is most similar to that of the Earth. It is the first choice for human beings to carry out interplanetary exploration. my country's first Mars exploration mission will not only achieve global remote sensing detection around Mars, but also break through key technologies such as Mars entry, descent, landing, inspection, and long-distance measurement and control communications. [0003] After the probe flies around Mars and enters the Martian atmosphere, the lander is s...

Claims

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Application Information

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IPC IPC(8): C25D9/04C25D5/18C25D5/44C25D21/12
CPCC25D9/04C25D5/18C25D5/44C25D21/12
Inventor辛世刚李国敏宋力昕乐军黄卿焦海洋周敏剑
OwnerSHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI