Abstract
Reaction-bonded silicon nitrides containing rare-earth oxide sintering additives were densified by gas pressure sintering. The sintering behavior, microstructure and mechanical properties of the resultant specimens were analyzed. For that purpose, Lu₂O₃-SiO₂ (US), La₂O₃-MgO (AM) and Y₂O₃-Al₂O₃ (YA) additive systems were selected. Among the tested compositions, densification of silicon nitride occurred at the lowest temperature when using the La₂O₃-MgO system. Since the Lu₂O₃-SiO₂ system has the highest melting temperature, full densification could not be achieved after sintering at 1950℃. However, the system had a reasonably high bending strength of 527 ㎫ at 1200℃ in air and a high fracture toughness of 9.2 ㎫·m 1/2 . The Y₂O₃-Al₂O₃ system had the highest room temperature bending strength of 1.2 ㎬.
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