Abstract
With the rise of mobile communication satellites and low-orbit Internet satellite constellations, wireless testing is required in spacecraft thermal vacuum test, and a comprehensive thermal testing environment for vacuum low-temperature absorption is needed. This paper clarifies the key parameters that need to be paid attention to in the application of vacuum absorbing materials under vacuum and low temperature environment, gives reference indexes, and puts forward the technical process and test results for the development of absorbing shroud.
Highlights
Introduction to absorbing materialsThe absorbing material is generally composed of a matrix material and an absorbing medium
Based on the above analysis, it is known that reflectance and density are the key parameters that need to be considered when the absorbing material is used in a vacuum and low temperature environment
The key parameters of carbon foam materials are as follows: the corresponding frequency reflectance is -28dB, the density is less than 0.5g / cm3, the condensable volatiles are less than 0.01%, the water vapor reabsorption is 0.85%, the surface emissivity is 0.896, and the vacuum quality loss is 1.39 %
Summary
The absorbing material is generally composed of a matrix material (or a binder) and an absorbing medium (absorbent). The binder is the base material to ensure the mechanical properties of the material; the absorbent is the loss medium, which is the key component that determines the absorption performance of the absorbing material. There are many classification methods of absorbing materials. According to their loss mechanism, they can be divided into dielectric loss type absorbing materials and magnetic loss type absorbing materials. According to their functional configuration, they can be divided into coating type and structural type [6]
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