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

Dense and fine-grained [beta]-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°[ndash]1800°C and a pressure of 30 MPa under N2. The [beta]-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 [alpha]-Si3N4 powder with the small amount of the additives. The use of nanosized amorphous Si3N4 powder accelerated the densification and the transformation to the [beta]-phase.

Authors:   Hotta, Mikinori; Shinoura, Takanori; Enomoto, Naoya; Hojo, Junichi
Journal:   Journal of the American Ceramic Society
Volume:   93
edition:   6
Year:   2010
Pages:   1544
DOI:   10.1111/j.1551-2916.2009.03575.x
Publication date:   01-Jun-2010
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