Vacuum furnace with movable hot zone
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United States of America Patent
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Jun 4, 1996
Grant Date -
N/A
app pub date -
Aug 23, 1994
filing date -
Aug 23, 1994
priority date (Note) -
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Abstract
A high temperature vacuum heat treating furnace has a hot zone, including heating elements and thermal insulation, which is movable between a heating location at least partly surrounding a load space and a cooling location remote from the load space. A cooling gas plenum around the hot zone in the heating location can eject cooling gas toward a load in the load space after the hot zone is retracted. Cooling rates approximately comparable to a furnace operable at four bar pressure can thereby be obtained in a furnace rated for no more than two bar internal pressure.
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