Industrial electric heating furnaces – Induction furnace device – With internal atmosphere control
Reexamination Certificate
2005-05-24
2005-05-24
Hoang, Tu (Department: 3742)
Industrial electric heating furnaces
Induction furnace device
With internal atmosphere control
C373S157000
Reexamination Certificate
active
06898232
ABSTRACT:
An induction furnace capable of operation at temperatures of over 3100° C. has a cooling assembly (60), which is selectively mounted to an upper end of the furnace wall (76). The cooling assembly includes a dome (62), which is actively cooled by cooling water coils (68). During the cool-down portion of a furnace run, cooling initially proceeds naturally, by conduction of heat away from the hot zone through a furnace insulation layer (58). Once the temperature within the furnace hot zone (20) reaches about 1500° C., a lifting mechanism (80), mounted to the dome, raises a cap (16) of the furnace slightly, allowing hot gases from the hot zone to mix with cooler gas in the dome. This speeds up cooling of the hot zone, reducing cool-down times significantly, without the need for encumbering the furnace itself with valves or other complex cooling mechanisms which have to be replaced periodically. The life of a graphite furnace susceptor (10) at the high operating temperature is increased by surrounding the susceptor with a barrier layer (40) of flexible graphite, which inhibits evaporation of the graphite. Additionally, witness disks (154), placed within the susceptor, provide an accurate temperature profile of the hot zone.
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Intermill Allan Webster
Miller Douglas J.
Ruoff Werner H.
Shao Richard L.
Strong Stephen L.
Cartiglia James R.
Hoang Tu
UCAR Carbon Company Inc.
Waddey & Patterson , P.C.
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