| 摘要 |
Crystalline zirconium oxide powder with a BET surface of less than 30 m2/g, preferably 10 to 20 m2/g, a primary particle size of 0.1 to 0.5 mu m, a monoclinic crystal structure and, optionally, a content of Y2O3 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 DEG to 400 DEG C., the product obtained is separated by filtration, washed chloride-free with water and dried at 100 DEG to 120 DEG C. The zirconium oxide powder can be used to produce sintered ceramics.
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