HIGH-STRENGTH MAGNESIA PARTIALLY STABILIZED ZIRCONIA

摘要

A high strength ceramic body and a method of making same are disclosed. The ceramic body is formed of ceramic composition containing 2.8-5.0 % by weight MgO, an effective amount of grain growth inhibiting material, and the balanc e being essentially zirconia. The crystalline microstructure of the ceramic bo dy comprises grains of cubic zirconia having an average grain size of less than about 30 microns in major dimension, 0.1-8.7 % by volume of discrete particl es of the grain growth inhibiting material, and precipitates of tetragonal zirconia having a substantially ellipsoidal shape with a long dimension of about 0.1-0.4 microns.