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Proceedings Paper

Manufacturing and performance test of a 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 lightweight 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 overcoatings. 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 will present the whole manufacturing process of such a space mirror starting from the raw material preparation until the polishing of the optic including cryo testing . 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: 21 August 2009
PDF: 9 pages
Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260K (21 August 2009); doi: 10.1117/12.825226
Show Author Affiliations
Matthias R. Krödel, ECM GmbH (Germany)
Tsuyoshi Ozaki, Mitsubishi Electric Corp. (Japan)
Masami Kume, 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)

Published in SPIE Proceedings Vol. 7426:
Optical Manufacturing and Testing VIII
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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