H - Electricity – 05 – B
Patent
H - Electricity
05
B
307/36
H05B 3/03 (2006.01) C22B 4/00 (2006.01) F27D 11/02 (2006.01) H05B 3/00 (2006.01) H05B 3/62 (2006.01)
Patent
CA 1045666
ELECTRIC RESISTANCE FURNACES FOR HIGH TEMPERATURE HEATING Abstract of the Disclosure An electric resistance furnace adapted for operation at about 1,800°C or higher temperatures even in an oxidizing or neutral atmosphere is disclosed. The furnace has a cylin- drical heating chamber defined by a generally cylindrical heat- ing element made of ceramic material, such as zirconium oxide and lanthanum chromide. The heating element has a wall thick- ness which is very small at its middle section and gradually increases toward each end. The middle section of the heating element defines the useful part of the heating chamber into which the heat generated by the heating element is effectively concentrated. An electrode comprising an annular foil of plati- num is provided at each end of the heating element to pass elec- tric current therethrough. A plurality of substantially equally spaced, longitudinally extending, parallel slots are present in the outer peripheral surface of each of the enlarged wall thick- ness portions of the heating element to provide allowance for thermal expansion of the heating element material. There is also disclosed a method of applying the electrodes to the heat- ing element. - 1 -
228224
Anthony Anne-Marie
Noda Takaaki
Agence Nationale de Valorisation de La Recherche
Daido Steel Company
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