Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes.
Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes.
复制标题
DOI：
10.1364/ao.46.002049
复制
发表时间：
2007-04
期刊：
影响因子：
1.9
通讯作者：
K. Enya;T. Nakagawa;H. Kaneda;T. Onaka;T. Ozaki;M. Kume
中科院分区：
文献类型：
--
作者：
K. Enya;T. Nakagawa;H. Kaneda;T. Onaka;T. Ozaki;M. Kume
我们报告的碳纤维增强碳化硅（C/SiC）复合材料反射镜的微观表面结构，已改进的宇宙学和天体物理学空间红外望远镜（SPICA）和其他冷却望远镜。C/SiC复合材料由碳纤维、碳化硅和残余硅组成。在抛光后的C/SiC反射镜表面发现了特殊的微观结构。这些结构被认为是由这些材料的不同硬度引起的。获得的裸镜的粗糙度是20 nm rms的平面和100 nm rms的曲面。已证实SiSiC浆料涂层可有效地将粗糙度降低至2nm rms。在室温和95 K下测量了反射镜的散射特性。没有发现通过冷却的散射特性的显着变化，这表明，微观表面结构是稳定的温度变化下降到低温值。具有SiSiC浆料涂层的C/SiC反射镜是SPICA望远镜的一个有希望的候选者。
We report on the microscopic surface structure of carbon-fiber-reinforced silicon carbide (C/SiC) composite mirrors that have been improved for the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C/SiC composite consists of carbon fiber, silicon carbide, and residual silicon. Specific microscopic structures are found on the surface of the bare C/SiC mirrors after polishing. These structures are considered to be caused by the different hardness of those materials. The roughness obtained for the bare mirrors is 20 nm rms for flat surfaces and 100 nm rms for curved surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing the roughness to 2 nm rms. The scattering properties of the mirrors were measured at room temperature and also at 95 K. No significant change was found in the scattering properties through cooling, which suggests that the microscopic surface structure is stable with changes in temperature down to cryogenic values. The C/SiC mirror with the SiSiC slurry coating is a promising candidate for the SPICA telescope.