US 5,601,874 A · Method of making moisture resistant aluminum nitride powder and powder produced thereby

Abstract

A method for making a moisture-resistant aluminum nitride-containing powder which includes (a) coating a layer of silicate onto aluminum nitride-containing powder having aluminum nitride on at least a portion of its surface and (b) heat-treating the coated aluminum nitride-containing powder at a temperature of from 350.degree. to 1000.degree. C. for a period of time sufficient to cause the silicate to react with the surface aluminum nitride thereby forming a layer of Si--Al--O--N bonded to the surface aluminum nitride. The silicate has alkyl or alkoxyalkyl radicals attached thereto. The method yields a moisture-resistant aluminum nitride-containing powder having a layer of Si--Al--O--N reaction-bonded to the surface aluminum nitride.

Claims11

Dependent claims

A method for making a moisture-resistant aluminum nitride-containing powder, comprising:

(a) oxidizing an aluminum nitride-containing powder by contacting with an oxygen containing atmosphere at elevated temperatures,
(b) coating a layer of a silicate onto said aluminum nitride-containing powder having aluminum nitride on at least a portion of its surface, the silicate having substituents thereon selected from the group consisting of alkyl and alkoxyalkyl radicals, and
(c) heat-treating the coated aluminum nitride-containing powder at a temperature of from 350.degree. to 1000.degree. C. for a period of time sufficient to cause the silicate to react with the surface aluminum nitride thereby forming treated aluminum nitride-containing powder having a layer of Si--Al--O--N bonded to the surface aluminum nitride.

Dependencies are inferred from the claim text.

Facts

Application

08/578,931Filed 27 Dec 1995 · continuation

Priority

8 Dec 1994

Granted

11 Feb 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

C04B 41/009
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone: characterised by the material treated
C01B 21/0728
With aluminium: after-treatment, e.g. grinding, purification
C04B 41/4584
Coating or impregnating , e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering…:…
C04B 41/81
Of only ceramics: coating or impregnation

Method of making moisture resistant aluminum nitride powder and powder produced thereby

Life of this patent

Method of making moisture resistant aluminum nitride powder and powder produced thereby

Life of this patent

Abstract

Claims11