Kenji Matsunaga, Toshihiro Ishikawa, Shinji Kajii,Toshihiko Hogami and Yasuhiko Kohtoku
Corporate Research & Development Ube Industries, LTD, Ube 755
The present study deals with the relationship between the mechanical properties up to high temperature and the fiber's volume fraction (Vf) of the Si-Ti-C-O fiber-bonded ceramics (FBC) which was produced by hot-pressing the laminated material of the sheets of pre-oxidized Si-Ti-C-O fiber with a surface oxide layer. As the Vf became higher, the compressive and flexural strengths at high temperatures became much larger. On the basis of the detailed investigation of the differences in the fracture appearance, it was concluded that the excellent mechanical properties of FBC with high Vf at high temperatures could be caused by the less influence of the softening of the SiO2, which existed in the interstices between the fibers, because the higher the Vf, the smaller the amount of the interstices becomes. The observed Close-packed structure of the Si-Ti-C-O fiber-bonded ceramics (Vf=90%) was very effective in retaining good mechanical properties up to high temperatures.
(Received July 15, 1996)
Ceramics composite, silicon-titanium-carbon-oxygen fiber, Compressive strength, Flexural strength, Fracture appearance
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