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Journal of Electron Microscopy 51:S159-S164 (2002)
© 2002 Oxford University Press

Full-length paper

HREM and EDS analysis of sintered SiC fibre reinforced MAS glass composites

Kenya Nagahisa1,*, Makoto Yoshida1, Eiji Abe2, Hideharu Fukunaga3 and Gen Sasaki1

1Department of Mechanical System, Graduate School of Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan,
2National Institute for Metals Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan and
3Kure National College of Technology, 2-2-11 Aga-Minami, Kure 737-8506, Japan

To whom correspondence should be addressed. E-mail: k_nagahisa{at}nifty.com

A polycrystalline-sintered SiC fibre reinforced magnesium-aluminosilicate (MAS) glass composite was fabricated by hot-pressing. The unidirectionally reinforced composite with a fibre volume fraction (Vf) of 50% and density of 2.84 g cm-3 was obtained. The matrix was composed of a glass phase, and Mg2Al4Si5O18 and ZnAl2O4 crystalline phases. The three-point flexural strength and quasi-static adsorbed energy of the composites at room temperature were 500 MPa and 6000 J m-2, respectively. A SiO2-rich glass layer was formed around the fibre. Furthermore, a 5–40 nm wide carbon-rich silicon–oxycarbide interphase with a layered structure was determined between the fibre and the SiO2-rich glass layer. The formation of both layers was caused by super-saturated oxygen which was contained in the raw glass powder. The preferable mechanical properties are due to the nano-scale interphase which allows for suitable interfacial bonding.

Keywords     sintered SiC fiber, MAS glass, interphase, HREM, TEM-EDS, CMC


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