Paper number 369


Toshio Ogasawara1, Takashi Ishikawa1, Naoto Suzuki1, Ian J. Davies2, Michiyuki Suzuki3, Jun Gotoh4 and Tetsuro Hirokawa5

1National Aerospace Laboratory (NAL), 6-13-1 Ohsawa, Mitaka, Tokyo, 181-0015, Japan
2Kyoto Institute of Technology, Matsugasaki, Sankyo-Ku, Kyoto, 606-8585, Japan
3Ube Industries Ltd., Ube, Yamaguchi, 755-8633, Japan
4Kawasaki Heavy Industries Ltd., Kagamigahara, Gifu, 405-8710, Japan
5Shikibo Ltd., Yokaichi, Shiga, 517-8577, Japan

Summary The present work investigates the tensile creep behavior (deformation and rupture) at 1100-1300 oC in air of a 3-D woven Si-Ti-C-O (Tyranno(tm)) fiber/SiC-based matrix composite with and without glass sealant. The composite contained Si-Ti-C-O fibers with an additional surface modification in order to improve interface properties. Although a significant decrease in tensile strength was observed in the unsealed composite beyond 1000oC in air (and attributed to oxidation of the fiber/matrix interface), the composite with glass sealant possessed excellent mechanical properties for short-term (<1hr.) exposure in air. In this study, tensile creep testing was conducted at 1100-1300 oC in air and the effect of glass sealant on medium- and long-term strength was investigated. In addition, chemical stability of the glass sealant was evaluated by X-ray diffraction analysis. The creep rupture behavior of the composite with glass sealant under long-term exposure is suggested to depend on several factors including decomposition, evaporation, and crystallization of the glass sealant material, in addition to the applied stress.
Keywords ceramic matrix composite, textile, creep, silicon carbide, interface, crystallization, X-ray diffraction.

Theme : Industrial Applications ; Aerospace Applications

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