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Abstract

A vacuum hot pressed alumina material having small, isometric grains; a uniform distribution thereof; relatively low, predominantly transgranular porosity; and a density approaching the theoretical density of pure alumina produced by vacuum hot pressing alumina powder which contains at least 98.0% alumina, is substantially free of any sintering aids or any other additives, and has a median particle size less than about 3 microns, in a vacuum hot press operated at a temperature of at least about 1350° C. and a pressure of at least 28 MPa (3500 PSI) for a sintering period of at least 1.5 hours. The vacuum hot pressed alumina material also has compressive strength, flexural strength, impact strength, and wear resistance superior to that for most conventional sintered alumina materials.

Patent Number

5,443,773

Assignee

Board of Control of Michigan Technological University, Houghton, Mich.

Application Number

212,158

Date Filed

3-14-1994

Certificate of Correction

Yes

Issue Date

8-22-1995

Disciplines

Engineering | Materials Science and Engineering

Process for producing high strength alumina

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