Vacuum furnace with convection heating and cooling
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United States of America Patent
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Nov 30, 1993
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N/A
app pub date -
Aug 14, 1991
filing date -
Aug 14, 1991
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Abstract
A high temperature vacuum furnace has a circulating path external to the heating chamber for facilitating inert gas circulation during initial convection heating of a high temperature vacuum furnace. The heating chamber of the furnace and a surrounding cooling gas introduction chamber are within a metallic convection shroud in such a way that the space in between defines a heating gas circulation chamber for circulating heated inert gas during low temperature heating for accelerating the heating-up of the hot zone to its normal operating temperatures. Once the hot zone has reached a selected temperature, the inert gas is pumped out and the furnace then operates in a vacuum. Quenching is achieved by introducing cooling gas into the heating chamber via nozzles through the heating chamber walls.
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