Low-transmission germanium-plated solar screen, thermal control assembly and preparation method

Abstract

The invention relates to a low-transmission germanium-plated solar screen, a thermal control assembly and a preparation method, which belong to the technical field of aerospace equipment. The low-transmission germanium-plated solar screen comprises a polyimide base film, wherein one side of the polyimide base film is plated with a germanium layer, and then the other side of the polyimide base filmis plated with a germanium layer. The principle of the low-transmission germanium-plated solar screen is that a vacuum magnetron sputtering coating technology is adopted to perform coating on two sides of the polyimide base film, thus the low-transmission germanium-plated solar screen with certain thermophysical properties, namely solar absorptivity (alpha), hemispherical emissivity (epsilon) andsolar transmissivity (tau) is obtained, the low-transmission germanium-plated solar screen can be used for parts, needing to reduce solar irradiation, of spacecrafts such as satellites, and the problem of temperature control after external parts of cabins of spacecrafts such as satellites are irradiated is effectively solved.

Description

technical field [0001] The invention relates to a low-transmission germanium-plated solar screen, which belongs to the technical field of aerospace equipment. Background technique [0002] The extravehicular components of the spacecraft will be in a high temperature state when they are irradiated by the sun’s rays when they are in orbit, and they will appear in a low temperature state due to environmental radiation when they enter the shadow area. This long-term alternating temperature change will have a negative impact on the performance and life of the components. Adverse effects, especially for some high-precision components, the thermal deformation caused by large temperature difference changes will seriously affect the critical dimensions of the component and have a fatal impact on its function. In order to reduce the temperature difference of the external components, it is necessary to use suitable shielding materials to reduce the energy projected by the sun on the co...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, a low-transmission germanium-coated solar screen is proposed, which reduces the solar transmittance and solves the problem that the traditional single-side germanium-coated solar screen has too high transmittance and cannot meet the thermal control requirements The problem

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