Nanostructure control of liquid-phase sintered Si3N4 ceramics by spark plasma sintering

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  • HOTTA Mikinori
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • HOJO Junichi
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University

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  • Nanostructure control of liquid-phase sintered Si<sub>3</sub>N<sub>4</sub> ceramics by spark plasma sintering

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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.

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