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US 4,542,112 AGranted
Method for producing spinel fine powders
AssigneeNGK Insulators, Ltd.
InventorsMinoru Matsui, Tomonori Takahashi
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Abstract
Spinel fine powders having high purity suitable for raw materials for producing a dense and uniform spinel sintered body, are produced by hydrolyzing an alcohol solution of specifically defined magnesium alkoxides and aluminum alkoxides in a specific mixing ratio.
Claims14
A method for producing spinel fine powders comprising the steps of:
- (a) dissolving 1 mole of magnesium alkoxide of the formula
- Mg(OR).sub.2
- wherein R is an alkyl group having 1-3 carbon atoms, and, from 2.1 to 3 moles of aluminum alkoxide of the formula
- Al(OR').sub.3
- wherein R' is an alkyl group having 1-3 carbon atoms, in an alcohol of the formula
- R"OH
- wherein R" is an alkyl group having 1-3 carbon atoms to form a solution;
- (b) hydrolyzing said solution;
- and
- (c) heating precipitates formed by said hydrolysis at temperatures from 700.degree. C. to 1200.degree. C. to form fine powders consisting of single-phase spinel-structured solid solutions of oxides of aluminum and magnesium of the formula
- MgOxAl.sub.2 O.sub.3
- wherein x is from 1.05 to 1.5.
9 more elements
Dependencies are inferred from the claim text.