Growth mechanism of Y alpha-SiAlON whiskers prepared by combustion synthesis


Novel Y alpha-SiAlON whiskers with high aspect ratios were prepared by combustion synthesis, except for common isotropic grains. The growth process of whiskers was investigated, and experimental results showed that the predominant growth mode of whiskers was the vapor-liquid-solid (VLS) mechanism. In contrast to the usual situation, here the liquid phase played two roles during the growth of Y alpha-SiAlON whiskers; that is to say, in addition to acting as a medium for mass transportation, the liquid phase took part in reactions itself. It was also found that proper addition of Fe2O3 could facilitate the development of whiskers with no remarkable deterioration on the phase assemblage of combustion products.



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Materials Science


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

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