Method for making high-purity, essentially crack-free crystals

Details Method for making high-purity, essentially crack-free crystals Method for making high-purity, essentially crack-free crystals

1985-09-03

1988-01-05

Heller, Gregory A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156616R, 156DIG70, 156DIG71, 156DIG83, 156DIG92, 422241, C10B 1510

Patent

active

047174447

ABSTRACT:
Disclosed is a method for making large, essentially crack-free crystals in a container coated with inert particulate silica. The particulate coating covers the interior wall of the container and prevents adhesion of the crystal to the wall and acts like a cushion to avoid cracking of the crystal or the container. It also serves as a barrier to prevent migration of impurities from the container wall into the crystal structure. The coating is formed by heating a silica-forming gaseous mixture flowing through the container, with components of this mixture either reacting to form the coating.

REFERENCES:
patent: 1986196 (1935-01-01), Grosse
patent: 4465546 (1984-08-01), Fitzpatrick et al.
patent: 4528163 (1985-07-01), Albrecht
patent: 4624735 (1986-11-01), Kayama et al.
Hackh's Chemical Dictionary, Fourth Edition, Grant, McGraw Hill Book Company, p. 185.

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