Formation of beta-SiAlON micropalings consisting of nanorods during combustion synthesis

resumo

Novel beta-SiAlON micropalings consisting of nanorods have been prepared by combustion synthesis with proper additives. According to TEM images associated with SAD pattern, the preferred growth direction of the nanorods is proved to be [0 0 1]. An epitaxial nucleation and anisotropic growth mechanism is proposed to explain the formation of those micropalings. By this mechanism, new fine crystals are formed on the side faces of coarse crystals and each coarse prismatic beta-SiAlON crystal is surrounded by parallel nanorods. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

palavras-chave

SILICON-NITRIDE NANOWIRES; CA-ALPHA-SIALON; GRAIN-GROWTH; CERAMICS; WHISKERS; PHASE; BETA-SI3N4; MORPHOLOGY; MECHANISM; BEHAVIOR

categoria

Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering

autores

Liu, GH; Chen, KX; Zhou, HP; Ren, KG; Li, JT; Pereira, C; Ferreira, JMF

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