Leco Corporation

Robert N Revesz

George J Sitek

Charles W Berk

A resistance heating furnace employs a pair of spaced electrodes, one of which is movable to clamp a resistive crucible between the electrodes for passing current therethrough for heating a specimen positioned in the crucible to fuse the specimen. A passageway is provided through one of the electrodes to permit an inert carrier gas to remove gases from the crucible for subsequent analysis. The electrode construction includes a relatively highly conductive base material electrically coupled to a power source for actuating the electrodes and inserts coupled to the surfaces of the electrodes which engage the resistive crucible. The insert material has a relatively high melting point and hardness and a relatively high thermal and electrical conductivity to increase the heating of the crucible and improve the durability of the electrodes. At least one of the electrodes is movable and actuated by a fluid cylinder for clamping the crucible between the electrodes at a constant pressure regardless of the crucible length.

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St. Joseph, MI, United States of America

Robert N Revesz