As an important part of the spacecraft thermal control protection system, the thermal control coating is like the skin of the human body, protecting the spacecraft from operating in various complex space environments.It is of great significance to ensure the normal operation of various parts and structures inside the spacecraft.

The performance of the thermal control coating mainly depends on the surface characteristics of the coating. The most important parameters are the solar absorption ratio αs and the hemispheric emission rate £H.Each material has a specific solar absorption ratio and hemispherical emissivity, and theoretically can be applied to a certain thermal environment to achieve a certain thermal control function.But the actual situation is: a single material often cannot meet the design requirements of spacecraft in terms of heat radiation performance, mechanical properties, specific gravity, and cost.For example, aluminum alloy is the most commonly used material in spacecraft. It has the advantages of low specific gravity, high strength, and relatively low cost. However, in some parts of stars and ships, the heat radiation performance of aluminum alloy cannot meet the demand.From the comprehensive consideration of thermal performance, mechanical performance, cost and other aspects, the best solution is to cover the surface with a layer of material with the required thermal radiation performance, that is, a thermal control coating, so as to achieve a balanced combination of multiple properties.