Electric furnace
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United States of America Patent
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-
Jan 26, 1999
Grant Date -
N/A
app pub date -
Oct 1, 1997
filing date -
Feb 1, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric furnace includes a heating element which is a hollow element made of a lanthanum chromite ceramic having an interior with two open ends in an longitudinal direction, terminal portions at the two ends, and a heat-generating portion between the terminal portions. The terminal portion has a cross-sectional area larger than that of the heat-generating portion on a plane perpendicular to the longitudinal direction. The heating element is provided with high-temperature electrodes and metallic lead wires attached to the terminal portions to generate heat in the heat-generating portion. The electric furnace further includes a heat-insulating material surrounding the heating element, and a hollow ceramic member placed in the interior of the heating element.
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