Sapphire growth from the melt using porous alumina raw batch mat

Details Sapphire growth from the melt using porous alumina raw batch mat Sapphire growth from the melt using porous alumina raw batch mat

1975-03-10

1976-12-21

Bascomb, Jr., Wilbur L.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

23273SP, 156615, 222 56, 222450, 423600, B01J 1718, C01F 702

Patent

active

039986861

ABSTRACT:
A method of growing sapphire crystals from the melt wherein a porous alumina raw material is used to replenish the melt during growth. The porous alumina is subjected to a high temperature, low pressure environment to remove adsorbed water and oxygen which, if allowed to enter the melt, would result in poor monocrystals. A sequence of steps is provided which allows a simultaneous outgassing of one charge of porous alumina and a continuous replenishing of the melt with porous alumina of a previously outgassed charge. The previously outgassed charge of alumina must be handled in a system devoid of water and oxygen to avoid readsorption of the impurities.

REFERENCES:
patent: 3212671 (1965-10-01), Rock
patent: 3471266 (1969-10-01), Belle, Jr.
patent: 3634045 (1972-01-01), Dugdale et al.
patent: 3960503 (1976-06-01), Rice

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