空间外热流全反射热控涂层制备及其辐照稳定性研究

当前国内外广泛在役的热控涂层突出存在空间外热流反射率低和辐照稳定性差等不足之处，难以满足快速发展的水星、太阳等高温强辐射环境下服役的近日深空探测器和空间低温天文观测望远镜等航天器的苛刻热控需求。本项目基于光谱设计和微结构调控与构筑，探求制备一种可全反射空间外热流的深冷型轻质抗辐照热控涂层。重点研究全反射涂层复合颜料的原位合成工艺、空间光热特性及其抗辐照性能，突破发展高温近日探测和低温深冷天文观测的热控涂层技术瓶颈，研究揭示涂层空间辐射环境条件下的退化过程及机理，为探索防护复杂空间极端环境综合作用下的材料制备技术和功能材料在航天器的应用提供研究基础和技术支持。

ZnO based white thermal control coatings (TCC) have been widely used to tune the thermal balance of spacecraft, due to its low solar absorptance and high emissivity. However, the TCCs’ lifetime suffered gradual degradation from cosmic radiation as well as the strong absorption of solar UV rays. Therefore, it is of great significance to fabricate lightweight and radiation-resistant coatings with novel thermal control ability. In our previous study, we synthesis composite pigments with tunable hollow structure, morphology, size distribution and optimized thermal-optical property. In this proposal, we plan to fabricate full-spectrum reflective lightweight coatings with ultralow solar absorptance and novel radiation-stability through optical design and defect engineering. The synthesis technology, thermal-control property and space radiation stability of the as-constructed coatings will be explored. Special attention will be paid to establish the radiation resistant principles for ZnO with varied dimensions through component, structure design as well as defect engineering. This project will be not only beneficial for fabricating novel coatings with enhanced lifetime, but also helpful in designing other smart materials used for deep-space exploration.