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Microstructural development of Si3N4–SiC–Y2O3 ceramics derived from polymeric precursors

Published online by Cambridge University Press:  31 January 2011

Yuji Iwamoto ,
Ko-ichi Kikuta  and
Shin-ichi Hirano
Yuji Iwamoto
Affiliation:
Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2-4-1 Mutsuno Atsuta-ku, Nagoya 456, Japan
Ko-ichi Kikuta
Affiliation:
National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Shin-ichi Hirano
Affiliation:
Department of Applied Chemistry, School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya 464-01, Japan
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Extract

[Si–Y–O–C–N] amorphous powders were synthesized by the pyrolysis at 1000 °C in N2 of chemically modified perhydropolysilazane using n-decyl alcohol and yttrium tri-methoxide. [Si–Y–O–C–N] amorphous powders yielded a unique fibrous microstructure by heat treatment in N2 at 1800 °C. The fibrous microstructure was composed of β–Si3N4 whiskers of submicron in diameter and more than 10 μm in length. Fully dense Si3N4 –SiC–Y2O3 ceramics were also fabricated by heat treatment at 1800 °C followed by powder-vehicle hot pressing at 1700 °C. After these two-step processings, [Si–Y–O–C–N] amorphous powders yielded a unique fine-grained microstructure composed of submicron grains with high aspect ratio.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 2 , February 1998 , pp. 353 - 361
Copyright
Copyright © Materials Research Society 1998

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