Electric heating – Microwave heating – Tunnel furnace
Patent
1976-09-13
1978-10-24
Envall, Jr., R. N.
Electric heating
Microwave heating
Tunnel furnace
219121R, H05H 126
Patent
active
041222920
ABSTRACT:
An electric arc heating vacuum apparatus for treating a workpiece of an electrically conducting material comprises an evacuated chamber, an electrically conducting support means on which the workpiece is mounted within said chamber, and a hollow hot cathode composed of a preset number of rods of a thermionic alloy. The rods, forming the hollow hot cathode, are affixed to an electrically conducting cathode support, which is connected to the negative terminal of a D.C. power source, the positive terminal of the same source being connected to the electrically conducting support means on which is mounted the workpiece being treated. This arrangement, provided the inert gas is fed into the cathode inner space between the hollow hot cathode and the workpiece being treated, causes an electric arc to initiate. Once started, the electric arc is sustained to provide heating of the workpiece being treated.
The invention drastically cuts down the costs involved in manufacturing a hollow hot cathode. It also makes it possible to enhance both the current intensity and the power of the electric arc in obtaining heating zones of various shapes on the surface of the workpiece being treated.
REFERENCES:
patent: 3409529 (1968-11-01), Chopra et al.
patent: 3634045 (1972-01-01), Dugdale et al.
patent: 3980802 (1976-09-01), Paton et al.
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