Stabilized zirconia bodies of improved toughness

Details Stabilized zirconia bodies of improved toughness Stabilized zirconia bodies of improved toughness

1984-08-20

1987-04-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501103, 501152, 428404, 264 66, C04B 3548

Patent

active

046596801

ABSTRACT:
This invention is directed to the preparation of ZrO.sub.2 bodies partially stabilized through the inclusion of 0.5-10% Y.sub.2 O.sub.3 with 1-10% of a secondary stabilizer selected from the group of MgO, CaO, CuO, ZnO, and CeO.sub.2. The method comprises sintering a shaped batch at 1600.degree.-1800.degree. C., quickly cooling the sintered shape to 1000.degree.-1475.degree. C., holding said shape within that temperature range to cause precipitation of tetragonal ZrO.sub.2 as islands within cubic ZrO.sub.2 grains, and then cooling to room temperature. The final product exhibits a microstructure consisting essentially of about 50-70% cubic ZrO.sub.2, greater than 20% and up to 50% tetragonal ZrO.sub.2, and less than 10% monoclinic ZrO.sub.2.

REFERENCES:
patent: 3541193 (1970-11-01), Adams
patent: 4067745 (1978-01-01), Garvie et al.
patent: 4279655 (1981-07-01), Garvie et al.
patent: 4344904 (1982-08-01), Yamada et al.
patent: 4370393 (1983-01-01), Watanabe et al.

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