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Si3N4–SiC–Y2O3 ceramics derived from yttrium-modified block copolymer of perhydropolysilazane and hydroxy-polycarbosilane

Published online by Cambridge University Press:  31 January 2011

Yuji Iwamoto ,
Ko-ichi Kikuta  and
Shin-ichi Hirano
Yuji Iwamoto
Affiliation:
Fine Ceramics Research Associated, Synergy Ceramics Laboratory, 2–4-1 Mutsuno Atsuta-ku, Nagoya 456–8587, Japan
Ko-ichi Kikuta
Affiliation:
Graduate School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya 464–8603, Japan
Shin-ichi Hirano
Affiliation:
Graduate School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya 464–8603, Japan
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Abstract

A polymeric precursor for the Si3N4–SiC–Y2O3 ceramic system was synthesized by block copolymerization of perhydropolysilazane (PHPS) with hydroxy-polycarbosilane (PCS-OH), followed by chemical modification with yttrium methoxide. Fully dense Si3N4–SiC–Y2O3 ceramics were successfully synthesized by pyrolysis of the polymeric precursor at 1000 °C, followed by hot pressing at 1800 °C in N2. The resulting ceramics revealed that β–SiC particles were dispersed in a size range of about 10–600 nm, and a large amount of β–SiC submicron particles were segregated at the β–Si3N4 matrix grain boundaries. It was found that the yttrium-modified block copolymer of PHPS and PCS-OH yielded unique binary ceramics composed of β–SiC–Y2O3 and β–SiC nanoparticle-dispersed Si3N4–Y2O3.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 1886 - 1895
Copyright
Copyright © Materials Research Society 1999

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