Abstract
The microstructural evolution of an Si3N4 ceramic pressureless sintered with Y2O3, MgO, and Cr2O3 additives has been studied. Two basic processing variables were investigated: sintered Si3N4 (SSN), starting with Si3N4 powder, and sintered reaction bonded Si3N4 (SRBSN), starting with silicon powder. Glass-encapsulated hot isostatic pressing of SSN-type preforms was also examined, resulting in a finer grain structure than the pressureless sintered equivalent. The lower oxygen content of the SRBSN materials had only a minimal effect upon the observed microstructure relative to SSN materials. However, considerable variation in oxidation behavior was apparent, with partial matrix crystallization to Y2Si2O7 in the SSN ceramic and crystallization to a mixed cation phase in SRBSN variants. 25 refs.
Published Version
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