Vacuum Evaporator for Copper

Abstract

In order to evaporate a large quantity of copper downward, the author designed a direct heating vacuum evaporator. It is composed of three molybdenum plate heaters each of which is suitably angled and fixed near to each other, so as to form a container for holding some of copper to be evaporated. Under the said container, a narrow gap is formed through which the molten copper is supplied to a downward opening and evaporated downward herefrom onts articles to be metallized. In these experiments, the rate of evaporation obtained was as high as 4. 17 mg · cm^-2 · sec^-1, and the distribution of deposits was quite reproducible.