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18 August 2005 NT-SiC (new-technology silicon carbide): application for space optics
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New-Technology Silicon Carbide (NT-SiC) is a reaction sintered silicon carbide with very high bending strength. Two times higher bending strength than other SiC materials is important characteristics in an optical mirror for space application. The space optics is to endure the launch environment such as mechanical vibration and shock as well as lightweight and good thermal stability of their figure. NT-SiC has no open pore. It provides good surface roughness for infrared and visible application, when its surface is polished without additional coatings. Additional advantages are in the fabrication process. The sintering temperature is significantly lower than that of pure silicon carbide ceramics and its sintering shrinkage is smaller than one percent. These advantages will provide rapid progress to fabricate large structures and will enable that one meter mirror will put practical use. It is concluded that NT-SiC has potential to provide large lightweight optical mirror.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Katsuhiko Tsuno, Kazuhiko Oono, Hiroshi Irikado, Tomohiro Ueda, Shoko Suyama, and Yoshiyasu Itoh "NT-SiC (new-technology silicon carbide): application for space optics", Proc. SPIE 5868, Optical Materials and Structures Technologies II, 58680D (18 August 2005);


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