The Performance of Inorganic Thermal Control Pigment and Coatings Based on ZnO/SBA-15

Beijing Spacecrafts, Beijing 100190

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    The work aims to develop a new type of low absorption (αS) high emissivity (εH) inorganic thermal control coating, and to study inorganic thermal control pigments with high UV-VIS - NIR reflectivity. Using self-made SBA-15 and ZnO precursors as raw materials, ZnO/SBA-15 fillers were prepared by solvothermal impregnation and high-temperature calcination, and then fillers and potassium silicate (K2SiO3) were used to prepare inorganic thermal control coatings.SAXD, XRD, SEM, solar reflectance spectroscopy were used to analyze the performance of fillers and coatings. The results showed that using zinc nitrate as the precursor,m(ZnO)∶m(SBA-15)=3∶7, sintered at 950 ℃ for 3 h to obtain ZnO/SBA-15 pigment with high UV-visible-near infrared reflectance. The test of ZnO/SBA-15/K2SiO3 inorganic coating shows that the αS is 0.09, εH is 0.91. Through the cross-cut test, it is known that the adhesion level of the coating is level 1. After 100 thermal cycle experiments at -196~100 ℃, the coating did not fall off or crack. It means that SBA-15 modify ZnO can obtain thermal control pigments with high UV reflectivity and low αS. The inorganic thermal control coating prepared with ZnO/SBA-15 powder as a pigment also has high ultraviolet reflectance, low αS and high εH, which can meet the needs of spacecraft for efficient heat dissipation and has a good application prospect.

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  • Received:March 10,2021
  • Revised:July 07,2021
  • Adopted:June 22,2021
  • Online: January 13,2022
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