Method and apparatus for producing a manganese-zinc ferrite sing

Details Method and apparatus for producing a manganese-zinc ferrite sing Method and apparatus for producing a manganese-zinc ferrite sing

1992-09-24

1993-12-07

Kunemund, Robert

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

1566171, 1566181, 1566202, 156DIG74, 156DIG77, 422249, C30B 1522

Patent

active

052680614

ABSTRACT:
A method and apparatus for producing a manganese-zinc ferrite single crystal using a local liquid pool formation which involves melting of a starting material in a crucible and lowering of the temperature of crucible to make the resultant melt maintain form three phase regions of an upper liquid pool region, an intermediate semi-rigid region and a lower solid region. A pair of heaters are disposed at the upper and side wall portions of crucible and controlled differently from each other so that the formed lower solid region extends at its peripheral portion throughout the inner surface of the side wall portion of the crucible, thereby minimizing the contact of the formed upper liquid pool region with the whole inner surface of the crucible. For monitoring respective temperatures of various portions in the crucible to control the heaters, there are provided thermocouples which includes a thermocouple for the crystal drawing port member, a thermocouple for the upper portion of crucible, a thermocouple for the upper portion of the side wall of crucible and a thermocouple for the lower portion of crucible.

REFERENCES:
patent: 4379021 (1983-04-01), Damen et al.
patent: 4382839 (1983-05-01), Torii et al.
patent: 4402787 (1983-09-01), Matsuzawa et al.
patent: 4409633 (1983-10-01), Watanabe et al.
patent: 4444615 (1984-04-01), Matsuzawa et al.
patent: 4519870 (1985-05-01), Matsuzawa et al.
patent: 4863554 (1989-09-01), Kawasaki et al.
Derwent, Inc. abstract of JP 60-46993.

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