The Cleanup Effects of the Molten Aluminum Surface by the Electro-magnetic Force in an Air-To-Air Vacuum Metallizer

An oblong crucible is heated with a high frequency alternative current of about 1kHz using an induction heating coil. This frequency is adopted to make it possible to raise the center of the molten aluminum by electromagnetic force to re-move the impurities of aluminum oxide or aluminum carbide from the aluminum surface. Thus, the aluminum surface is clean for a long time.