Stabilized zirconia bodies of improved toughness

C - Chemistry – Metallurgy – 04 – B

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25/141, 261/27

C04B 35/48 (2006.01) C04B 35/486 (2006.01)

Patent

CA 1236855

Abstract of the Disclosure This invention is directed to the preparation of ZrO2 bodies partially stabilized through the inclusion of 0.5-10% Y2O3 with 1-10% of a secondary stabilizer selected from the group of MgO, CaO, CuO, ZnO, and CeO2. The method comprises sintering a shaped batch at 1600°-1800°C, quickly cooling the sintered shape to 1000°-1475°C, holding said shape within that temperature range to cause precipitation of tetragonal ZrO2 as islands within cubic ZrO2 grains, and then cooling to room temperature. The final product exhibits a microstructure consisting essentially of about 50-70% cubic ZrO2, greater than 20% and up to 50% tetragonal ZrO2, and less than 10% monoclinic ZrO2.

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