Abstract
An experimental program was conducted to investigate the degradation in mechanical properties of silicon based ceramics exposed to high temperature oxidizing environments. This paper will present the results of testing on three grades of reaction bonded silicon nitride (RBSN): Norton NC 350, Kawecki Berylco Industries RBSN, and Ford 2.7 RBSN. Testing included flexural stress rupture at 1200°C and stepped temperature stress rupture (STSR) experiments. The latter test was devised for this study and is a variation of the stress rupture test such that a range of temperatures are employed. The purpose of the STSR test is to explore the potential stress-temperature regimes of static fatigue failure. In addition, a combined cycle durability sequence was applied to the three RBSN’s. This procedure is a crude service simulation involving static heat soaks and rapid thermal cycling on bend bars. Extensive fractography was conducted to identify causes of failure.
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