Water cooled crucible

Industrial electric heating furnaces – Electron beam furnace device – Vaporizing furnace

Patent

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Details

373 10, 373 16, 21912115, H01J 37305

Patent

active

050088971

ABSTRACT:
The present invention provides a water cooled crucible adapted to be received in a crucible support element of an electron beam evaporation system. The crucible comprises a base wall and a sidewall upstanding from the base wall to form a rim and pocket located between the rim and the base wall for containing molten material to be evaporated. The support element has an inner surface surrounding the sidewall of the crucible to define an annular passage for circulating cooling water in a direction taken from the rim to the base wall of the crucible. The sidewall includes a thickened region positioned to conduct heat generated at the top surface of the molten material and having a thickness such that the outer surface contacts the inner surface of the support element. The thickened region has a plurality of circumferentially spaced, preferably spiral grooves defined at the outer surface of the thickened region. The grooves have a total inner surface area greater than the area of contact between the outer surface of the thickened region and the inner surface of the support element to increase the heat transfer between the sidewall and cooling water in order to prevent the onset of wetting.

REFERENCES:
patent: 3554512 (1971-01-01), Elliott
patent: 4304396 (1981-12-01), Udoh
patent: 4866239 (1989-09-01), Egermeier

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