The effects of fabrication variables on the high-temperature strength of hot-pressed Si3N4 containing 5 wt% Y203 were studied. Materials containing a crystalline grain-boundary phase, formed as a consequence of a high-temperature presintering heat treatment and identified as Si3N4.Y,03, had hightemperature strengths significantly superior to those observed for materials containing a glass phase.

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Die Herstellungseinflüsse auf die Hochtemperaturfestigkeit von heißgepreßtem Si3N4 , dasS Gew.‐% Y2O3 enthält, werden untersucht.

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