Zirconium dioxide powder, processes for its preparation and its

Details Zirconium dioxide powder, processes for its preparation and its Zirconium dioxide powder, processes for its preparation and its

1990-05-31

1991-04-23

Russel, Jeffrey E.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423DIG12, C01G 2500

Patent

active

050098780

ABSTRACT:
1. Unstablized or stablized zirconium dioxide powder and processes for its preparation.
2.1 The use of aqueous solutions and the isolation of precipitates are substantial disadvantages of conventional processes for the preparation of zirconium dioxide powders. Furthermore, the products often do not have the desired flow properties, compression properties and sinter properties owing to the lack of microcrystallinity.
2.2 By melting zirconyl chloride optionally with a stabilizer or with a precursor of a stabilizer in the presence of a diol of the general formula HO--X--OH, in which X represents a saturated hydrocarbon radical having 2 to 5 carbon atoms, evaporating off water and hydrogen chloride, calcining the reaction product at elevated temperature in an oxygen-containing gas and optionally milling the calcined residue, an unstabilized or stabilized zirconium dioxide powder having good properties can be prepared without the use of disadvantageous process measures.
2.3 The unstabilized or stabilized zirconium dioxide powder is suitable for the production of sintered articles which can be subjected to high mechanical and/or thermal stresses.

REFERENCES:
patent: 2980507 (1961-04-01), Rossmy
patent: 3634027 (1972-01-01), Champetier et al.
patent: 4627966 (1986-12-01), Micheli
patent: 4933154 (1990-06-01), Kwon
Handbook of Preparative Inorganic Chemistry, 2nd ed., Brauer, ed. Academic Press, 1965, pp. 1220-1221.

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