Nanostructure control of liquid-phase sintered Si3N4 ceramics by spark plasma sintering
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概要
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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.
著者
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Hojo Junichi
Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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Hotta Mikinori
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Hojo Junichi
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Hojo Junichi
Department Chemistry & Biochemistry, Graduate School of Engineering, Kyushu University
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