Abstract
Implementation of lightweight and long-lasting thermal-control coatings (TCCs) is vital for regulating the surface temperature and energy consumption of spacecraft. Herein, Zn2SiO4 and hexagonal boron nitride (hBN) based inorganic TCCs are developed with potassium silicate binder. The αs/εH (solar absorptance/ hemispherical emittance) ratio of the Zn2SiO4, ZnO and hBN coatings are 0.096, 0.190 and 0.107, respectively. Compared to the classical ZnO based Z-93 coating, both Zn2SiO4/K2SiO3 and hBN/K2SiO3 coatings show superior initial thermophysical properties. After vacuum-proton irradiation, the αs of Zn2SiO4, Z-93 and hBN coatings increased from 0.091, 0.167 and 0.098 to 0.193, 0.253 and 0.241, respectively. Apparently, the as-developed Zn2SiO4 coating exhibits exceptional heat-dissipation and radiation-resistance features in relation to the hBN and Z-93 TCCs.
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