Method of growing monocrystals of corundum from a melt

Details Method of growing monocrystals of corundum from a melt Method of growing monocrystals of corundum from a melt

1978-04-25

1981-12-01

Bernstein, Hiram H.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156DIG61, 156DIG83, C30B 1102

Patent

active

043034659

ABSTRACT:
A method for growing corundum monocrystals from a melt, and a heater in a device for carrying said method into effect.
According to the method the growth process of corundum monocrystals uses alumina placed in a container which is made of a group VI metal of the periodic table, and having a melting point above 2300.degree. C. The growth process occurs in a shielding atmosphere with the use of Joule heating by passing the container with the melt through a temperature gradient effective across the crystallization zone.
The resistive heater used in the device is made as a bifilar coil of a solid tungsten bar.

REFERENCES:
patent: 3608050 (1971-09-01), Carman et al.
Lawson et al., Preparation of Single Crystals, London, Butterworth, 1958, pp. 57-58, 41, 14-18.

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