Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Notes
Effects of starting composition and carbon content on the formation of Ca-α SiAlON powders by carbothermal reduction–nitridation
Mikinori HOTTAJunichi TATAMIKatsutoshi KOMEYATakeshi MEGUROYi-Bing CHENG
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2010 Volume 118 Issue 1381 Pages 827-829

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Abstract
Ca-α SiAlON powders were prepared at different starting compositions and carbon contents at 1450°C for 2 h in N2 from mixtures of SiO2, Al2O3, CaCO3 and carbon powders by carbothermal reduction–nitridation. Crystalline phases and particle morphology of the products were investigated. With increasing the x value in nominal Ca-α SiAlON compositions CaxSi12−3xAl3xOxN16−x, the number of small hollow spheres decreased and the size of primary grains consisting of the hollow spheres increased. The addition of carbon powder to more than 1.2 times of the necessary stoichiometric value was required to form Ca-α SiAlON hollow spheres composed of ultrafine grains.
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© 2010 The Ceramic Society of Japan
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