Mechanical and thermal performance of C/SiC composites for SPICA mirror

Ozaki, Tsuyoshi; Kume, Masami; Oshima, Takeharu; Matsumoto, Toshio; Kaneda, Hidehiro; Murakami, Hiroshi; Kataza, Koichi; Enya, Keigo; Yui, Yukari Y.; Onaka, Takashi; Krödel, Matthias R.

doi:10.1117/12.552484

Cited by 6 publications

(3 citation statements)

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“…It is, however, an inhomogeneous composite material and special coating may be needed to improve the surface smoothness by polishing. Significant progress has been made to increase the homogeneity and the stiffness of C/SiC composite (Ozaki et al, 2004). Preliminary measurements of 160 mm C/SiC test mirrors indicate small deformation at cryogenic temperatures, which can be further reduced by improvements of the material properties (Kaneda et al, 2004b).…”

Section: Telescope Systemmentioning

confidence: 98%

SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Onaka

2005

Advances in Space Research

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Section: Telescope Systemmentioning

confidence: 98%

SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Onaka

2005

Advances in Space Research

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“…The mirror has been characterized for figure, surface roughness and structural stability 8,9 . 500× Microscope photo of near the brazing area post polishing given in fig 4, it found that the width of the weld line is about 8~20 μ m, the general area of weld line is about 0.3% of the mirror surface area .…”

Section: Test Of Weld Sic Mirrormentioning

confidence: 99%

Fabrication and testing of a 600mm diameter brazing SiC mirror

Zhang

Wang

et al. 2009

SPIE Proceedings

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SiC is a preferential material for space large aperture mirror at present. Aperture of 1 meter sic mirror can meet most requirements of space optical systems. For larger aperture sic mirror, it is not economical and safe to make the monolithic body directly. The SiC mirror brazed assembly with several segments can solve these problems. In this paper, one Φ600 mm sic plane mirror as demonstration welded with 3 radial segments is roughly grinded to the required figure at first, then the mirror is finely grinded and polished by CCOS technology, the RMS of the figure error is less than 1/20λ (λ = 632.8nm) finally. The problems of the preferential removal near braze joint and material removing rate influenced by deformation of mirror surface are solved. Methods of reducing the residual stress of mirror are discussed. At last, some measurements and experiments are carried on, and the results conclude that the brazed SiC mirror can meet the requirement of large aperture optical systems.

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“…Carbon fibre reinforced silicon carbide (C f /SiC) composite is one of the promising materials for the SPICA telescope and has characteristics similar to SiC and can provide a higher fracture toughness than SiC. 1 C f /SiC is also a promising new structural material for a variety of high temperature burner environments, including in aeronautical turbines and advanced rocket propulsion thrust chambers. 2 All these applications of C f /SiC result from its characteristics of lightweight, hard and wear resistant and stable in oxidising environments at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Reactive composite brazing of C_f/SiC composites to Ti alloy with (Ag–6Al)+Ti+C composite filler materials

Wang

Huang

Zhang

et al. 2011

Materials Science and Technology

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Cf/SiC composite and Ti alloy (TC4) were successfully joined by the mixed powders of Ag, Al, Ti and short carbon fibres under vacuum condition. The Microstructure of the joints was investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry. The results show that the good chemical bonding and reactive composite brazing joints are obtained by reactive composite brazing with both (Ag–6Al)+Ti and (Ag–6Al)+Ti+C filler materials. The addition of short carbon fibres contributes a lot to the shear strength by alleviating the thermal stress of the joints and to the in situ synthesised TiC which surround the uniformly distributed short carbon fibres. Ti element can improve filler metal's wettability to Cf/SiC composite and restrain the oxidation of Al element. The max shear strength obtained is 90·8 MPa and the optimal parameter is brazing at 910°C within 10 min.

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Mechanical and thermal performance of C/SiC composites for SPICA mirror

Cited by 6 publications

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SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Fabrication and testing of a 600mm diameter brazing SiC mirror

Reactive composite brazing of C_f/SiC composites to Ti alloy with (Ag–6Al)+Ti+C composite filler materials

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Mechanical and thermal performance of C/SiC composites for SPICA mirror

Cited by 6 publications

References 0 publications

SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

SPICA: A 3.5m space infrared telescope for mid- and far-infrared astronomy

Fabrication and testing of a 600mm diameter brazing SiC mirror

Reactive composite brazing of Cf/SiC composites to Ti alloy with (Ag–6Al)+Ti+C composite filler materials

Contact Info

Product

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Reactive composite brazing of C_f/SiC composites to Ti alloy with (Ag–6Al)+Ti+C composite filler materials