Power feed through for vacuum electric furnaces

Details Power feed through for vacuum electric furnaces Power feed through for vacuum electric furnaces

1979-01-15

1980-10-07

Envall, Jr., Roy N.

H05B 308, H05B 716

Patent

active

042270324

ABSTRACT:
A power feed through for vacuum electric furnaces is provided for furnaces in which work pieces to be processed are placed inside a vacuum electric furnace chamber which is evacuated with a mechanical pump and then backfilled with a partial pressure of gas containing nitrogen, such as nitrogen or ammonia, or a hydrocarbon such as methane, or mixtures thereof. The work pieces to be processed are electrically connected to the negative (cathode) terminal of a D.C. power supply, the positive terminal being connected to the chamber wall and to ground. The power supply is energized and a portion of the gas is ionized. The work pieces are heated to temperatures of approximately 650.degree. to 1100.degree. F. for ion nitriding or to temperatures of approximately 1650.degree. to 1900.degree. F. for ion carburizing. The heating is effected at least in part by the ion activity but auxiliary heating elements may be used if desired. Materials that are sputtered from the work travel in straight lines, tend to build up on work supports and power feeders thereby causing electrical shorting. Shorting is greatly reduced in this structure by the use of shields in the form of spaced insulating discs carried on the power feeders.

REFERENCES:
patent: 1837256 (1931-12-01), Egan
patent: 2837654 (1958-06-01), Berghaus
patent: 3437784 (1969-04-01), Jones et al.
patent: 3650930 (1972-03-01), Jones et al.
patent: 3761370 (1973-09-01), Keller
patent: 4077783 (1978-03-01), Honacker
patent: 4102637 (1978-07-01), Kreider et al.
patent: 4124199 (1978-11-01), Jones et al.
Case Hardening, Metals Handbook, 1948, American Society for Metals, pp. 677-702.

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