Patent ID: 6723672
Filing Date: 2004-04-20
Classification: C04B

Abstract:
A Mg-PSZ ceramic body formed from a ceramic powder composition consisting essentially of about 2.8-5.0% by weight MgO, an effective amount of a grain growth inhibiting additive, not more than about 0.3 mole % of yttria, ceria, other rare earth oxide, or strontia, and the balance being essentially zirconia, wherein said ceramic body has a crystalline microstructure comprising grains of cubic zirconia having an average grain size of less than about 30 microns in major dimension, discrete precipitates of tetragonal zirconia within the grains of cubic zirconia, and about 0.1-8.7% by volume of discrete particles of a grain growth inhibiting material which is or is formed from the grain growth inhibiting additive.