Macrocrystalline aluminum oxide and method for its manufacture

Details Macrocrystalline aluminum oxide and method for its manufacture Macrocrystalline aluminum oxide and method for its manufacture

1979-11-19

1981-12-29

Bernstein, Hiram

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

51309, 425625, C01B 102

Patent

active

043080880

ABSTRACT:
A method for producing hexagonal, laminar, alpha aluminum oxide monocrystals having a grain size of about 16 to about 250 microns, and a diameter to thickness ratio of about 3:1 to about 7:1. Aluminum hydroxide of particle size greater than 60 microns is calcined in the presence of a fluorine-containing mineralizer at a temperature of greater than 1200.degree. C. but no more than 1450.degree. C., and the desired grain size is separated from the calcinate.

REFERENCES:
patent: 2538959 (1951-01-01), Ballard
patent: 3011870 (1961-12-01), Webb et al.
patent: 3121623 (1964-02-01), Nesin
patent: 3175883 (1965-03-01), Lindsay
patent: 3718494 (1973-02-01), Jacobson
patent: 4019914 (1977-04-01), Esper
patent: 4130402 (1978-12-01), Schepers et al.

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