Ceramic heater element with molybdenum disilicide and...

H - Electricity – 05 – B

Patent

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H05B 3/14 (2006.01) F27D 11/02 (2006.01)

Patent

CA 2154613

A ceramic composition for the manufacture of an improved ceramic electric heater element is disclosed. The composition contains 33-50 vol% molybdenum disilicide, the balance being partially stabilized zirconia or partially stabilized zirconia-ceria solid solution. The average grain size of the components in the sintered mixture made into the ceramic heater element of a desired shape, is less than 10µm. The ceramic heater element has a skin of zirconia or zirconia-ceria generated in-situ, having thickness in excess of 10µm. A portion of the zirconia or zirconia- ceria solid solution particles may be replaced by zirconia fibres. The sintered ceramic heater elements are suitable to be incorporated in an electrical resistance furnace or an induction furnace, and are capable of operating up to 2000°C under oxidizing conditions.

Composition de céramique pour la fabrication d'un élément chauffant électrique en céramique, amélioré. La composition renferme 33 à 50 % en volume de disiliciure de molybdène, le reste étant constitué d'une solution solide de zircone partiellement stabilisée ou d'une solution solide de zircone-oxyde de cérium partiellement stabilisée. La taille moyenne des grains du mélange fritté servant à obtenir l'élément chauffant en céramique de forme voulue, est inférieure à 10 microns. L'élément chauffant en céramique possède un revêtement de zircone ou de zircone-oxyde de cérium, produit in situ, d'une épaisseur supérieure à 10 microns. Une partie des particules de la solution solide de zircone ou de zircone-oxyde de cérium peut être remplacée par des fibres de zircone. Les éléments chauffants en céramique frittée peuvent être incorporés dans un four à résistance électrique ou un four à induction, et ils peuvent atteindre des températures de l'ordre de 2000 degrés C dans des conditions d'oxydation.

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