Specimens of various polyphase Si3N4 materials fabricated in the Si-Mg-O-N system, and a commercial Si3N4 material were subjected to oxidation treatments prior to flexural strength determinations at 1400° C. It was demonstrated that a pre-oxidation treatment could significantly improve the high-temperature strength. The compositional change induced by oxidation which can decrease the volume fraction of the viscous phase present in these materials at high temperatures is believed to be responsible for the observed strengthening.
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Lange, F.F., Davis, B.I. & Metcalf, M.G. Stengthening of polyphase Si3N4 materials through oxidation. J Mater Sci 18, 1497–1505 (1983). https://doi.org/10.1007/BF01111970
- Flexural Strength
- Compositional Change
- Oxidation Treatment