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首页> 外文期刊>Applied optics >Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes
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Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes

机译：太空低温望远镜用C / SiC复合镜的微观表面结构

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摘要

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.
机译：我们报告了碳纤维增强的碳化硅（C / SiC）复合镜的微观表面结构，该结构已针对宇宙红外和天体物理学的太空红外望远镜（SPICA）和其他冷却望远镜进行了改进。 C / SiC复合材料由碳纤维，碳化硅和残余硅组成。抛光后，在裸露的C / SiC镜表面上发现了特定的微观结构。这些结构被认为是由这些材料的不同硬度引起的。裸镜获得的粗糙度对于平坦表面为20 nm rms，对于弯曲表面为100 nm rms。可以确认，SiSiC浆料涂层有效地将粗糙度降低至2nm rms。反射镜的散射特性是在室温和95 K下测量的。通过冷却，散射特性未发现明显变化，这表明微观表面结构在温度变化至低温值时是稳定的。带有SiSiC浆料涂层的C / SiC反射镜是SPICA望远镜的有希望的候选者。

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