国外空间反射镜材料及应用分析

空间反射镜材料的选取与反射镜镜坯加工工艺直接影响光学遥感卫星的戍像能力。提高空间相机分辨率的直接途径是增大光学系统的口径，因此大口径空间反射镜的材料技术和镜坯加工技术受到了高度关注。在未来相当长的时间内，相关技术都是研究热点。文章重点研究了常用空间反射镜材料的特性，这些材料包括美国康宁公司的超低膨胀玻璃、德国肖特集团的微晶玻璃、碳化硅和碳化硅复合材料，并对熔接法、浇铸法、烧结法等常用的大口径反射镜镜坯加工方法进行了研究，调研了各类材料的实际在轨应用情况。最后根据上述材料的热膨胀系数和反射镜结构强度等特征，分析总结了这些材料的适用范围。

Research and Application of Foreign Space Mirror Materials

Selection of space mirror materials and manufacturing process of mirror blank directly affect imaging capacity of an optical remote sensing satellite. The direct method for improving resolution of space camera is to improve the aperture of optical system, so material technology for producing large aperture spaceborne mirror and manufacturing approaches to mirror blanks get great attention in foreign countries. For quite a long time, these technologies have been an important research direction. In this paper, the characteristics of main space mirror materials which include Corning＇s ultra-low expansion glass（ULE）, SCHOTT＇s Zerodur , SiC and SiC composite are researched, and manufacturing methods of mirror blanks such as sealing, casting and sintering are analyzed. Space applications of these materials are summarized. Based on characteristics of the aforementioned materials such as coefficient of thermal expansion and strength of mirror structure, applicable range of the materials is analyzed.