Abstract
The literature on the α/β silicon nitride transformation is reviewed briefly. Data are presented on the kinetics of the tranformation of 1600° C on low and high purity silicon nitride powders. The addition of magnesia increased the rate of transformation while the addition of yttria had no effect. Scanning electron photomicrographs show clearly the morphology changes that accompany the transformation. It is concluded that the transformation occurs via a solution-precipitation mechanism and that α and β are probably low and high temperature forms of silicon nitride.
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Messier, D.R., Riley, F.L. & Brook, R.J. The α/β silicon nitride phase transformation. J Mater Sci 13, 1199–1205 (1978). https://doi.org/10.1007/BF00544725
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DOI: https://doi.org/10.1007/BF00544725