Sintering of Si3N4 Powders Synthesized by a Combustion Reaction
- 1 January 1987
- journal article
- Published by Ceramic Society of Japan in Journal of the Ceramic Association, Japan
- Vol. 95 (1106) , 955-960
- https://doi.org/10.2109/jcersj1950.95.1106_955
Abstract
Fine Si3N4 powders were synthesized by combustion of Si mixed with a proper amount of Si3N4 under high nitrogen pressure of 10MPa. The obtained Si3N4 powders consisted of 30wt% α- and 70wt% β-Si3N4 free from unreacted Si, and had a mean particle size of 1.8μm. Dense Si3N4 ceramics with the bending strength of 700MPa were obtained by both HIP sintering without additives and pressureless sintering with Al2O3-Y2O3 additives. A sintered body obtained by HIPing had a high Vickers microhardness of 15GPa and high bending strength of 500MPa at 1200°C.Keywords
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