Formation and dispersal of rod-like alpha-SWON seed crystals synthesized by combustion method

resumo

Rod-like single-phase seed crystals of yttrium-alpha-SiAlONs were synthesized by combustion synthesis method. The XRD patterns, the morphologies of products and formation mechanism were investigated. The SEM observation of crystals exhibits well developed elongated hexagonal crystals with highly agglomerative features, assigned to pure and well-crystallized alpha-SiAlON. After special chemical treatments and water washing, the powders are well dispersed and still keep elongated hexagonal crystals, and the XRD pattern shows that the rod-like structure is crystalline yttrium-alpha-SiAlON with only a trace of beta-SiAlON.

palavras-chave

MICROSTRUCTURE CONTROL; MECHANICAL-PROPERTIES; SIALON CERAMICS; SILICON-NITRIDE; ALPHA-SI3N4; SIAION

categoria

Metallurgy & Metallurgical Engineering

autores

Fu, RL; Ferreira, JMF; Yang, KT; Chen, KX

nossos autores

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