The effect of MgO and ZrO 2 dopants, added separeately or simultaneously, on the grain size, denisity, and toughness of Al 2 O 3 was studied. Small ZrO 2 addotoopms (<100 ppm) had little effect, whereas larger amounts decreased the sintered density. Additions of Mgo Up to the solubility limit (∼ 300 ppm) increased both density and grain size; further additions had little effect on the density but strongly reduced grain size.
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Kosmač et al. (1982) studied this question.
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