Vapor Generation and Deposition of Zinc at High Rates

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Abstract
A system for zinc vapor generation and deposition onto a strip substrate at high rates is described. A resistance heated graphite crucible with a special design to suppress uncontrolled boiling is able to produce zinc vapor outputs as high as 150 lb/h for the 300 in.2 hearth area utilized. An efficient system for nozzling the zinc vapor onto the strip substrate from an enclosed hood allows this maximum vaporization rate to be condensed uniformly at a thickness of 0.6 mils across a 12-in. width at a line speed of 100 ft/min. Control of the vaporization rate is obtained through variation in the power input according to a heat flow model and also by means of a barometric liquid-zinc leg which is used to fill and empty the crucible and feed it continuously from outside the vacuum chamber. Other methods used to control the system are also discussed briefly as is the type of coating produced by deposition at these high rates.

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