Zirconia ceramics and method for producing same

Details Zirconia ceramics and method for producing same Zirconia ceramics and method for producing same

1989-11-17

1990-12-11

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501103, 264 66, C04B 3548

Patent

active

049771140

ABSTRACT:
Disclosed are zirconia ceramics superior in mechanical strength, hardness and toughness and a method for producing them. The zirconia ceramics contain ca. 7-12 mol % of cerium oxide and ca. 2-7 mol % of magnesium oxide and have an average crystal grain size of crystal grains thereof of 1 .mu.m or less, at least ca. 80 mol % of the crystal grains being tetragonal grains and the balance being monoclinic grains, and have a bending strength of at least 100 kg/mm.sup.2, a fracture toughness of at least 10 MNm.sup.-1.5 and a Vickers hardness of at least 1000 kg/mm.sup.2. The method comprises calcining a hydrate obtained by coprecipitation method from water-soluble salts of cerium and magnesium and a basic salt of zirconium or a hydrate obtained by adding water-soluble salts of cerium and magnesium to a zirconium hydrate and neutralizing the mixture of hydrates, further grinding the calcined hydrate to obtain zirconia powders of 1 .mu.m or less in average crystal grain size, then shaping the powders and sintering the resulting shaped product.

REFERENCES:
patent: 4035191 (1977-07-01), Johns
patent: 4525464 (1985-06-01), Claussen et al.
patent: 4656145 (1987-04-01), Soroi
patent: 4690910 (1987-09-01), Tsukuma et al.
patent: 4719091 (1988-01-01), Wusirika
Proceedings--Australian Ceramic Conference (12th), V. Gross et al, Aug. 1986, pp. 371-378.

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