Preparation of Ca alpha-SiAlON powders with rod-like crystals by combustion synthesis

resumo

Ca alpha-SiAlON powders with rod-like crystals were prepared by combustion synthesis from different starting compositions. The growth mechanism of the rod-like Ca alpha-SiAlON crystals was investigated and two growth modes were observed. One is liquid phase precipitation, and the other is nucleation and growth on smooth surfaces of the as-developed large crystals. During the development of the rod-like Ca alpha-SiAlON crystals, anisotropic growth occurred with the [0 0 1] direction being the fast growth direction. (C) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

palavras-chave

SILICON-NITRIDE CERAMICS; AL-O-N; MECHANICAL-PROPERTIES; SEED CRYSTALS; MICROSTRUCTURE; PHASE; GROWTH

categoria

Materials Science

autores

Liu, GH; Chen, KX; Zhou, HP; Ning, XS; Pereira, C; Ferreira, JMF

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