Abstract
Flexural strength of an yttria‐doped, slip‐cast, sintered reaction‐bonded silicon nitride was evaluated as a function of temperature (20° to 1400°C in air), applied stress, and time. Static oxidation at 700o to 1400°C was investigated in detail; in tests at 1000°C in air, the material showed anomalous weight gain. Flexural stress‐rupture testing a 800° to 1200°C in air indicated that the material is susceptible to stress‐enhanced oxidation and early failure. Fractographic evidence for time‐dependent and ‐independent failures is presented.
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