Information was developed on the effects of processing variables and micro-structure on the fracture strength of ceramics made from sinterable oxide powders. The characteristic of high strength being associated with low porosities and small average crystal sizes was observed in ceramics of both MgO and BeO, but no quantita¬tive correlation was found. Highest strengths were obtained when the time and tem¬perature of sintering were sufficient for densification above about 96 per cent of theoretical, provided that the sintering time and temperature was insufficient to give crystal sizes larger than the smallest observed, 5-6 microns for BeO ceramics and about 10 microns for MgO ceramics.
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