The gas pressure sintering of silicon nitride with 5% MgO as an additive was performed under 10 atm N//2 at 1450 to 1900 degree C. Maximum density of 95% of theoretical value, 3. 19 g/cm**3, was obtained at 1800 degree C. The densification was due to liquid phase sintering and divided into two processes, rearrangement and solution-precipitation. Microstructural studies of cleavages and etched ones revealed that the densification was mainly attributed to rearrangement at lower temperatures than 1500 degree C and solution-precipitation at higher temperatures.
|Title of host publication||J Ceram Soc Jpn|
|Number of pages||5|
|Publication status||Published - 1976|
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