Device for igniting an alumino-thermal composition, crucible...

B - Operations – Transporting – 23 – K

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B23K 23/00 (2006.01)

Patent

CA 2680000

The invention relates to a device (1) for igniting an alumino-thermal composition (4), characterised in that it comprises an electric resistor (40, 43) for connecting two electrodes (20, 21) and to be supplied by an electric current source in order to generate heat by a Joule effect, said electric resistor being exposed to a medium containing oxygen and carbon so that the temperature rise of the medium by the resistor results in the formation of carbon monoxide, and then in an exothermal reaction of the latter with oxygen, thus generating a flame capable of igniting the alumino-thermal composition.

L'invention concerne un dispositif pour l'allumage (1) d'une composition aluminothermigue (4, caractérisé en ce qu' il comprend une résistance électrique (40, 43) reliant deux électrodes (20, 21) et destinée à être alimentée avec une source de courant électrique pour provoquer un dégagement de chaleur par effet Joule, ladite résistance électrique étant exposée à un milieu comprenant de l'oxygène et du carbone de telle sorte que l'élévation de température du milieu par la résistance provoque la formation de monoxyde de carbone, puis une réaction exothermique de ce dernier avec l'oxygène, provoquant l'apparition d'une flamme apte à provoquer l'allumage de la composition aluminothermique.

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