Single-turn induction heating coil for floating-zone melting pro

Details Single-turn induction heating coil for floating-zone melting pro Single-turn induction heating coil for floating-zone melting pro

1988-03-21

1989-05-23

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1043, 373139, 336223, 336232, H05B 640

Patent

active

048332879

ABSTRACT:
This invention relates to a single-turn induction heating coil used for floating-zone melting process. According to this invention, both ends of a single-turn coil are crossed each other in a peripheral direction of the coil so as to form an overlap section, and a pair of power supply portions are arranged on an outer peripheral wall so as to allow this RF current flowing through the coil, thereby forming a uniform magnetic field of the coil, and realizing magnetic concentration on an object. As a result, the floating-zone melting process can be stabilized to increase the productivity and striation, microscopic resistance variations and other quality defects of semiconductor crystals manufactured by the heating coil can be prevented as well.

REFERENCES:
patent: 2655588 (1953-10-01), Wadhams
patent: 2678371 (1954-05-01), Andrew
patent: 3031555 (1962-04-01), Ross et al.
patent: 3607114 (1971-09-01), Keller
patent: 3607138 (1971-09-01), Keller
patent: 3827017 (1974-07-01), Keller
patent: 4220839 (1980-09-01), De Leon

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