| 摘要 |
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.
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