TRANSLUCENT POLYCRYSTALLINE ALUMINA CERAMIC

摘要

A polycrystallinc body comprising aluminum oxide, magnesium oxide, hafnium oxide, and yttrium oxide in which alumina grains have an average size of at least lOµm and wherein the yttrium oxide is present in an amount of at least 6 ppm of the weight of the ceramic body, and the magnesium and hafnium oxides are present at a molar ratio of about 0.5: 1 to about 3: 1.