Abstract
The compacts consisted of α, β-Si3N4 and free silicon are heat treated in the range 1650° C to 1750° C in an argon atmosphere in order to observe the following behaviours; the α to β phase transformation and variations of the microstructure during heat treatment in silicon nitride. For the microstructural observation of the heat treated specimens, the same grains in the polished surface were investigated before and after eliminating the retained silicon by etching. The α to β phase transformation, in this case, occurs via silicon melts irrespective of added β-Si3N4. Both α and β phases are soluted and precipitated into molten silicon and their morphology are changed from an equiaxed shape to prismatic one. Although elongated grains are precipitated at low temperature or in the early stage of heat treatment, fine precipitated β grains are mainly observed with increasing heat treating temperature.
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