The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1993
Filed:
Jun. 14, 1991
Friedrich-Wilhelm Dorn, Hurth, DE;
Heinz Zschach, Cologne, DE;
Hoechst Aktiengesellschaft, Frankfurt Am Main, DE;
Abstract
For producing finely disperse aluminum nitride by reacting hydroxides of aluminum with carbon in a molar ratio of (1:1.5) to (1:2.5), the hydroxides of aluminum are intensively ground together with carbon, in particular carbon black, using a non-aqueous grinding fluid. After the non-aqueous grinding fluid has been separated off from the suspension, the ground material obtained is calcined at 400.degree. to 1000.degree. C., while passing nitrogen through. The material obtained is then treated under intensive contact with nitrogen for 1 to 100 hours at 1400.degree. to 1700.degree. C., before the excess carbon contained in the reaction product is removed by heating to 500.degree. to 900.degree. C. in contact with oxygen-containing gases. The hydroxides of aluminum and the carbon can also be intensively ground separately from one another, using a non-aqueous grinding fluid, and the suspensions obtained can be mixed.