Electrical resistance heating element for an electric furnace and process for manufacturing such a resistance element
AssigneeElectricite de France (Service National)
InventorsMarianne Le Boulch, Thierry Chartier, Jean-Marc Laurent, Patrice Goeuriot, Fran.cedilla.ois Valdivieso
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Abstract
This electrical resistance heating element (10) for an electric furnace comprises a resistive heating part (12) made of a ceramic. The ceramic comprises a sintered mixture of silicon carbide particles, of dopant particles, suitable for obtaining an electrically conductive phase after sintering, and of mineral particles.
Claims10
Electrical resistance heating element for an electric furnace, comprising a resistive heating part (12) made of a ceramic, characterised:
- in that the ceramic comprises a sintered mixture of silicon carbide particles, of dopant particles for obtaining an electrically conductive phase after sintering, and of mineral particles;
- in that the mineral particles comprise alumina and yttrium oxide;
- and in that the dopant particles comprise nickel oxide.
Process for manufacturing a ceramic resistance heating element for an electric furnace, characterized in that it comprises the steps of:
- preparing a mixture of silicon carbide particles, dopant particles and mineral particles, wherein said dopant particles comprise nickel oxide and said mineral particles comprise alumina and yttrium oxide;
- adding at least one organic material to the mixture prepared;
- forming the resistance element by extrusion;
- heat-treating the resistance element formed, for removing the said at least one organic material;
- and
- sintering the resistance element formed, the said dopant particles being suitable for obtaining an electrically conductive phase after sintering.
Dependencies are inferred from the claim text.