Paper number 369
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CREEP RUPTURE OF 3-D WOVEN SI-TI-C-O FIBER/SIC-BASED MATRIX COMPOSITE WITH GLASS SEALANT |
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. |