J. Japan Inst. Metals, Vol. 60, No. 12 (1996),
pp. 1236-1242

Influence of Fiber Volume Fraction on Mechanical Property ofSi-Ti-C-O Fiber-Bonded Ceramics

Kenji Matsunaga, Toshihiro Ishikawa, Shinji Kajii,Toshihiko Hogami and Yasuhiko Kohtoku

Abstract:

The present study deals with the relationship between the mechanical properties up to high temperature and the fiber's volume fraction (V_f) 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 V_f 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 V_f 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 V_f, the smaller the amount of the interstices becomes. The observed Close-packed structure of the Si-Ti-C-O fiber-bonded ceramics (V_f=90%) was very effective in retaining good mechanical properties up to high temperatures.

(Received July 15, 1996)

Keywords:

Ceramics composite, silicon-titanium-carbon-oxygen fiber, Compressive strength, Flexural strength, Fracture appearance

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