Electrical heating elements

H - Electricity – 05 – B

Patent

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Details

H05B 3/16 (2006.01) C23C 4/02 (2006.01) C23C 4/10 (2006.01) H05B 3/26 (2006.01) H05B 3/82 (2006.01)

Patent

CA 2221740

An electrically resistive heating element for liquids and a method of fabricating same. The heating element comprises a substrate (10) formed of an electrically insulating material or formed of an electrically conductive material provided with an electrically insulating coating, whereby in both cases the substrate (10) presents an electrically non-conductive surface on at least one side. First (14a) and second (14b) laterally spaced contact areas are disposed over the electrically non-conductive surface and a thermally sprayed resistive oxide layer (16) is applied to the electrically non-conductive surface and disposed over or under parts of the contact areas (14a, 14b) to enable an electric current to be passed through the resistive oxide layer (16) via these first and second contact areas.

L'invention concerne un élément de chauffage résistif pour liquides, et son procédé de fabrication. L'élément de chauffage comprend un substrat (10) formé d'une matière d'isolation électrique ou formé d'une matière à conduction électrique pourvue d'un revêtement d'isolation électrique, le substrat (10) présentant, dans les deux cas, une surface non électroconductrice sur l'un des côtés au moins. La première (14a) et la seconde (14b) zone de contact espacées latéralement sont disposées au-dessus de la surface non électroconductrice et une couche d'oxyde (16) résistive est pulvérisée thermiquement sur la surface non électroconductrice et disposée au-dessus ou au-dessous de parties des surfaces de contact (14a, 14b) pour permettre au courant électrique de traverser la couche d'oxyde résistive (16) en passant par cette première et cette deuxième zone de contact.

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