COATING OF WORKPIECES BY VAPOR DEPOSITION

摘要

To replenish a bath of molten metal composition in a vacuum chamber, used for the vapor-deposition coating of a workpiece, a wire of the same composition as the bath is continuously fed into the chamber with immersion of its free end into the bath which is maintained at vaporization temperature by an electron beam trained thereon. The wire is preheated, at a point immediately adjoining its immersed end, by the passage of a current therethrough, by electromagnetic induction or by another electron beam trained thereon.