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Proceedings Paper

Manufacturing and performance test of an 800-mm space optic
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Paper Abstract

Next generation space telescopes, which are currently being developed in the US and Europe, require large-scale light-weight reflectors with high specific strength, high specific stiffness, low CTE, and high thermal conductivity. To meet budget constraints, they also require materials that produce surfaces suitable for polishing without expensive over-coatings. HB-Cesic - a European and Japanese trademark of ECM - is a Hybrid Carbon-Fiber Reinforced SiC composite developed jointly by ECM and MELCO to meet these challenges. The material's mechanical performance, such as stiffness, bending strength, and fracture toughness are significantly improved compared to the classic ECM Cesic material (type MF). Thermal expansion and thermal conductivity of HB-Cesic at cryogenic temperatures are now partly established; and excellent performance for large future space mirrors and structures are expected. This paper presents the design and manufacturing of an 800-mm mirror for space application, starting with the C/C raw material preparation to the finishing of the components, including the polishing of the mirror. The letters "HB" in HB-Cesic stand for "hybrid" to indicate that the C/C raw material is composed of a mixture of different types of chopped, short carbon-fibers.

Paper Details

Date Published: 25 July 2008
PDF: 9 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180A (25 July 2008); doi: 10.1117/12.788965
Show Author Affiliations
Matthias R. Krödel, ECM Ingenieur-Unternehmen für Energie- und Umwelttechnik GmbH (Germany)
Tsuyoshi Ozaki, Mitsubishi Electric Corp. (Japan)
Masami Kume, Mitsubishi Electric Corp. (Japan)
Akira Furuya, Mitsubishi Electric Corp. (Japan)
Yukari Y. Yui, Japan Aerospace Exploration Agency (Japan)
Hiroko Imai, Japan Aerospace Exploration Agency (Japan)
Haruyoshi Katayama, Japan Aerospace Exploration Agency (Japan)
Yoshio Tange, Japan Aerospace Exploration Agency (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)
Hidehiro Kaneda, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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