高辐射涂层对刚性隔热瓦性能的影响

Effects of Coating on Performance Rigid Tile

文摘由二硅化钼和玻璃料等组成制备了一种刚性隔热瓦表面使用的高辐射涂层,研究了高辐射涂层对刚性隔热瓦结构、力学性能、防水特性、辐射特性、辐射加热试验、风洞试验和深空碎片高速撞击试验的影响规律。结果表明:刚性隔热瓦表面高辐射涂层为致密梯度结构,表面平整,辐射系数大于0.85,防水效果好;高辐射涂层提高了材料的弯曲强度和肖氏硬度;厚度方向的拉伸强度因为涂层和基体的不匹配降低了近50%;石英灯辐射加热试验中,致密的高辐射涂层提高了表面黑度,吸收更多热量使表面温度升高,背面温度上升快。风洞试验中,高辐射涂层将气动加热辐射掉一部分,降低了表面温度从而使材料具有更低的背面温度;含高辐射涂层的刚性隔热瓦能经受典型空间碎片冲击,未产生致命性的破坏。

A coating constituted of MoSi2 and melted glass with the high emittance was prepared. The effects of the coating on the microstructure and performances of the rigid tiles were investigated. The results indicated that thewaterproof coating was dense with an emittance of about 0.85. After coating process,the flexural strength and shore hardness of the rigid tiles increased. The tensile strength in transverse orientation was about 50% of that without coating. The back side temperature of rigid tiles with coating was higer than that without coating,when rigid tile was exposed to the radiation heat. However,the back side temperature of rigid tiles with coating was lower than that without coating,when rigid tile was exposed to the simulative heat of re-entry. The rigid tiles with coating created a little hole after the chip attack.