Abstract
Two calcium‐doped α‐SiAlON compositions (Ca0.6Si10.2Al1.8−O0.6N15.4 and Ca1.8Si6.6Al5.4O1.8N14.2) were prepared by hot pressing at 1600° and 1500°C, respectively, for complete phase transformation from α‐Si3N4 to α‐SiAlON. Both samples were subsequently fired at different temperatures for different periods of time to study the grain growth of α‐SiAlON. Elongated α‐SiAlON grains were developed in both samples at high temperatures. The kinetics of grain growth was investigated based on the variations in length and width of the α‐SiAlON grains under different sintering conditions. Different growth rates were found between the length and width directions of the α‐SiAlON crystals, resulting in anisotropic grain growth in the microstructural development.
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