Zirconium oxide powder, process for its preparation and use

Details Zirconium oxide powder, process for its preparation and use Zirconium oxide powder, process for its preparation and use

1992-07-27

1993-02-23

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

423266, 423608, C04B 3548, C01G 2502

Patent

active

051889919

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/l 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 120.degree. C.
The zirconium oxide powder can be used to produce sintered ceramics.

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patent: 4619817 (1986-10-01), Stambaugh et al.
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patent: 4664894 (1987-05-01), Suzuki et al.
patent: 4722915 (1988-02-01), Soma et al.
German Office Action, Jul. 1988, German P3737064.2-41.

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