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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1372 (December) (2009)  >  pp.1302-1305

Journal of the Ceramic Society of Japan
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Nanostructure control of liquid-phase sintered Si3N4 ceramics by spark plasma sintering

Mikinori HOTTA1) and Junichi HOJO1)
1) Department of Applied Chemistry, Faculty of Engineering, Kyushu University

  Submicron-sized α-Si3N4 and nanosized amorphous Si3N4 powders were sintered by spark plasma sintering at 1700°C for holding times of 60 to 120 s at heating rates of 1.7 to 6.1°C/s with Y2O3 and Al2O3 sintering additives. The nanostructure control of liquid-phase sintered Si3N4 ceramics was achieved by selecting optimum heating schedules such as temperature, holding time and heating rate. Fully dense nanostructured β-Si3N4 ceramics with grain size of 150 nm were prepared using nanosized amorphous Si3N4 starting powder. The transformation to β-phase in Si3N4 ceramics obtained from the nanosized amorphous Si3N4 powder was more greatly accelerated than that from submicron-sized α-Si3N4 powder.


Keyword:
Silicon nitride, Spark plasma sintering, Nanostructure, Heating schedule, Densification, Phase transformation

Received: May 25, 2009
Accepted: October 15, 2009 , Published online: December 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan

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