Zirconium oxide powder

Details Zirconium oxide powder Zirconium oxide powder

1988-10-31

1991-04-30

Lewis, Michael L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

501103, 501104, 423266, C01G 2502

Patent

active

050116738

ABSTRACT:
Crystalline zirconium oxide powder with a BET surface of less than 30 m.sup.2 /g, preferably 10 to 20 m.sup.2 /g, a primary particle size of 0.1 to 0.5 .mu.m, a monoclinic crystal structure and, optionally, a content of Y.sub.2 O.sub.3 of 1 to 10% by weight and/or of 1 to 10 % by wt. MgO.
It is produced by adding an aqueous zirconium salt solution optionally containing yttrium ions and/or magnesium ions under agitation into a vessel which contains an aqueous base solution such as e.g. sodium hydroxide solution with a content of NaOH which corresponds to an excess of at least 0.5 mole/1 NaOH. The mixture obtained in this manner is then treated hydrothermally at a temperature of 200.degree. to 400.degree. C., the product obtained is separated by filtration, washed chloride-free with water and dried at 100.degree. to 200.degree. C.
The zirconium oxide power can be used to produce sintered ceramics.

REFERENCES:
patent: 4201594 (1980-05-01), Walters et al.
patent: 4520114 (1985-05-01), David
patent: 4588576 (1986-05-01), David
patent: 4619817 (1986-10-01), Stambaugh et al.
patent: 4722915 (1988-02-01), Soma et al.

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