Preparation of high purity, homogeneous zirconia mixtures

Details Preparation of high purity, homogeneous zirconia mixtures Preparation of high purity, homogeneous zirconia mixtures

1987-10-05

1989-03-07

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501104, 501152, 423 71, 423 85, 423608, C04B 3548, C01G 2502

Patent

active

048106801

ABSTRACT:
A method is provided of preparing high-purity mixtures of zirconia and another metal oxide substantially free of sodium oxide impurity. Trioxydizirconium ion and a salt of another metal in an aqueous solution are added to a highly basic solution, resulting in the homogeneous precipitation of the combined hydroxides or hydrous oxides. The precipitate is recovered, washed with the water and then with an organic solvent, and then dried, most preferably employing an azeotropic distillation procedure. The resulting material is then calcined to provide a mixture of zirconia with the other metal oxide. In a preferred embodiment, the zirconia mixtures are in the form of fine powders which can be sintered to form a product having greater than 99% of its theoretical density.

REFERENCES:
patent: 3312631 (1967-04-01), Smith
patent: 4501818 (1985-02-01), Rossi
"Wet Chemical Preparation of Zirconia Powders: Their Microstructure and Behavior," M.A.C.G. Van de Graaf and A. J. Burggraaf, p. 744.
"Microstructural Development During Pressing and Sintering of Ultra Fine Zirconia Powders," M.A.C.G. Van de Graaf et al., Ceramic Powders, p. 783 (1978).
"Technique for Preparing Highly Sinterable Oxide Powders," Dole et al., 32 Materials Science and Engineering, 277 (1978).
"The Preparation of Zirconia Powders," C. J. Norman and S. L. Jones, Convention Papers.
"Characteristics and Sintering Behavior of Zirconia Ultra-Fine Powders," K. Haberko, 5 Ceramurgia Int., 148 (1979).

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