Method for the chemical preparation of zirconia alloy powders an

Details Method for the chemical preparation of zirconia alloy powders an Method for the chemical preparation of zirconia alloy powders an

1987-06-08

1991-04-02

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501105, 501127, 501153, 423600, 423608, C04B 3548

Patent

active

050047108

ABSTRACT:
A ceramic article having good fractured toughness comprising substantially spherical ceramic particles, which may be a ceramic oxide such as zirconia or zirconia combined with yttrium oxide. The ceramic particles are compacted and sintered to a density greater than 90 percent of theoretical density. The article is characterized by a substantially uniform chemical composition and a substantially inclusion-free, homogeneous microstructure, which may be a metastable crystalline phase with less than 10 volume percent monoclinic crystalline phase. The article is produced by dissolving, such as in water, a soluble compound containing a metal, e.g. zirconium, to form a solute. A precipitation agent, such as sodium hydroxide or ammonium hydroxide, is combined with the solute to precipitate a hydrophilic colloid of the metal hydroxide, such as zirconium hydroxide. The precipitate is formed into particles which are rapidly solidified while preventing agglomeration thereof. The particles are dried, compressed to increase density and reduce size, calcined to convert the metal hydroxide to oxide, e.g. zirconium oxide, and then the particles are compacted and sintered to form a dense ceramic article.

REFERENCES:
patent: 4587225 (1986-05-01), Tsukuma et al.
patent: 4605631 (1986-08-01), Rossi
patent: 4639356 (1987-01-01), O'Toole et al.
patent: 4664894 (1987-05-01), Suzuki et al.
patent: 4665040 (1987-05-01), Kurita

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