Zone purification of cylindrical ingots

Details Zone purification of cylindrical ingots Zone purification of cylindrical ingots

1979-10-25

1981-08-25

Bernstein, Hiram

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156DIG70, C30B 1314

Patent

active

042857600

ABSTRACT:
Cylindrical ingots of materials that expand on melting or freezing are purified or zone refined by a process which includes providing a tubular container having both a cylindrical cavity and a slot along its entire length. In zone refining, as is well-known, a heater of a predetermined elevated temperature traverses from one end of a normally solid charge to another at least once to thereby sweep impurities to one end of the charge. During the zone refining process, material which expands on phase change (e.g., solid to liquid) flows into the slot. As a consequence, fractures and other damage to the container and/or zone-refined material are minimized. The substantially round cross section is retained following removal of the excess material from the zone refined ingot after solidification.

REFERENCES:
patent: 2773923 (1956-12-01), Smith
patent: 2967095 (1961-01-01), Herrick
patent: 2984626 (1961-05-01), Leterer
patent: 3644097 (1972-02-01), Knudsen
Zone Melting 2nd Ed., Pfann, Wiley & Sons, N. Y., pp. 47-52, 73, 74.
Crystal Growth-Ed. Pamplin, Pergamon Press N.Y., 3/75, pp. 137-138.

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