A method for forming an electrical heating element by flame...

H - Electricity – 01 – C

Patent

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H01C 17/26 (2006.01) H05B 3/12 (2006.01)

Patent

CA 2581357

A method for forming an electrical heating element by flame spraying a metal/metallic oxide matrix, wherein a flame sprayed metal/metallic oxide matrix is deposited onto an insulating or conductive substrate such as to have a higher resistance than is required for a designed use, and an intermittently pulsed high voltage DC supply is applied across the matrix such as to produce continuous electrically conductive paths through the matrix which permanently increase the overall conduction and simultaneously reduce the overall resistance of the metal/metallic matrix to achieve a desired resistance value.

L'invention porte sur un procédé qui permet de former un élément chauffant électrique par projection à chaud d'une matrice métallique/d'oxyde métallique, une matrice métallique/d'oxyde métallique étant déposée par projection à chaud sur un substrat isolant ou conducteur afin de conférer à ce dernier une résistance supérieure à celle qui lui est nécessaire pour un usage particulier, et une alimentation en c.c. à haute tension pulsée intermittente étant appliquée aux bornes de la matrice afin de produire à travers cette dernière des tracés continuellement électroconducteurs augmentant de manière permanente la conduction globale et réduisant simultanément la résistance globale de la matrice métallique/d'oxyde métallique de manière à obtenir une valeur de résistance désirée.

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