Abstract:We investigated the thermal radiation properties of one type of thermal control coatings with stainless
steel as substrate under thermal cycles. The rapid thermal cycles ranged from -196℃ to 900℃. Solar absorptance,
hemispheric emittance and SEM were measured for analyzing the thermal radiation properties of the coatings. The results
show that solar absorptance of the thermal control coating had little change under thermal cycles, while the cycles
had obvious effect on hemispheric emittance of the coatings, which increased from 0. 57 to 0. 72, and finally the hemispheric
emittance was steady at 0. 75. According to SEM, the surface of the coating was better crystallized under thermal
cycles, and the grain size on the surface of the coating was bigger. The difference of microstructures on the surfaces
of coatings leads to the changes of thermal radiation properties.
