Method for directional solidification of single crystals

Details Method for directional solidification of single crystals Method for directional solidification of single crystals

1989-08-23

1991-09-10

Kunemund, Robert

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

1566162, 1566163, 1566164, 15661641, 373116, C30B 1102

Patent

active

050471139

ABSTRACT:
The invention provides a method for growth of single crystals from the melt by directional solidification in vertical bottom seeded crucibles. The crucible confining the melt is insulated radially and from above. The heat is supplied to the melt by a heater submerged in the melt or an auxiliary heater above the crucible containing the melt. A small portion of the melt is enclosed between the submerged heater and the growing crystal. The confined melt in this region is thermally stratified and therefore stagnant.

REFERENCES:
patent: 2936505 (1960-05-01), Witucki et al.
patent: 3591340 (1971-07-01), Plaskett
patent: 3898051 (1975-08-01), Schmid
patent: 4404172 (1983-09-01), Gault
patent: 4687538 (1987-08-01), Pastor
Tyutyunnik et al., "LiH Crystal Growth by Bridgman-Stockbarger Method", Journal of Crystal Growth, vol. 68, No. 3, Oct. 1984, p. 743.
"A Novel Application of the Vertical Gradient Freeze Method to the Growth of High Quality III-V Crystals", W. A. Gault et al., Journal of Crystal Growth 74 491-506 (1986).
Muller, Crystals, Springer-Verlag, New York, pp. 58-59, 131 (1988).

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