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Spark Plasma Sintering of Nanosized Amorphous Silicon Nitride Powder with a Small Amount of Sintering Additive

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Abstract:

Dense and fine-grained -Si3N4 ceramics were successfully obtained with a small amount of sintering additives, 1.5 mass% Y2O3 and 0.5 mass% Al2O3, using nanosized amorphous Si3N4 powder by spark plasma sintering at temperatures of 1500°–1800°C and a pressure of 30 MPa under N2. The -Si3N4 ceramics were composed of equiaxed grains with an average size of 300 nm. A higher sintering temperature was required for the densification of submicrometer-sized α-Si3N4 powder with the small amount of the additives. The use of nanosized amorphous Si3N4 powder accelerated the densification and the transformation to the -phase.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2009.03575.x

Affiliations: Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan

Publication date: June 1, 2010

bsc/jace/2010/00000093/00000006/art00009
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