随着空间技术的快速发展, 对大尺寸空间反射镜部件的需求愈发强烈。本文从材料和制备技术角度分析了大尺寸碳化硅反射镜的发展趋势, 并以 Φ1.0 m口径常压烧结碳化硅拼接式技术验证镜研制过程为例, 对拼接式反射镜的分块镜设计制备、连接、光学加工等过程进行了探讨。此外, 结合实际的工程化应用需求, 对 1.0 m口径碳化硅拼接式技术验证镜进行了包括热真空、振动和抗辐照等在内的环境模拟试验。试验结果表明: 通过合理的制备技术, Φ1.0 m口径的碳化硅拼接式技术验证镜光学加工后面形 RMS达到了 0.038λ (λ=632.8 nm), 经历热真空和振动的环境模拟考核后, 其面形 RMS分别为 0.037λ和 0.036λ; 此外, 拼接式反射镜经过 60Co γ射线辐照测试后, 反射率指标基本保持不变, 显示了良好的工程应用前景。

With the space technologies progress rapidly, demand of large-size mirrors is intensively growing. In this paper, the developing trend of large-size space mirrors was discussed from the angles of material and fabrication technology. Taking 1.0 m aperture technical validation brazed mirror as an example, the design and fabrication of segments, joining and optic machining were analyzed. In addition, the 1.0 m aperture technical validation brazed mirror was performed environmental tests including thermal-vacuum test, vibration test and anti-radiation test in order to evaluate its engineering applicability. The experimental results show that the surface figure of the 1.0 m aperture technical validation brazed mirror changed from 0.038λ (λ=632.8 nm) to 0.037λ and 0.036λ after thermo-vacuum test and vibration test. Additionally, reflectivity of the brazed mirror basically kept stable after 60Co γ-ray radiation test, indicating a brilliant application prospect.