Heat exchanger core based on aluminum and process for...

F - Mech Eng,Light,Heat,Weapons – 28 – F

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F28F 21/08 (2006.01) B23K 1/00 (2006.01) B23K 35/02 (2006.01) B23K 35/28 (2006.01) F28D 1/053 (2006.01) F28F 1/12 (2006.01) B23K 35/30 (2006.01) B23K 35/36 (2006.01)

Patent

CA 2275569

By the use of a heat exchanger tube not required for adhesion of Zn in advance and a fin not clad with a brazing composition, a heat exchanger core is provided which has corrosion resistance and brazing capability comparable to or higher than those of the conventional counterpart. Applied onto an outer surface of an extruded flattened tube (4) as a heat exchanger tube is a brazing composition (7) derived from a mixture of silicon and fluorine type flux, and a fin (5) formed of an aluminum-based zinc-containing material is prepared. The extruded flattened tube (4) and the fin (5) are then heated at a given temperature so that the same are brought into brazed relation to each other, and a mixed diffusion layer (8) of silicon and zinc is then on the outer surface of the extruded flattened tube (4).

L'utilisation d'un tube d'échangeur thermique ne nécessitant pas l'adhésion de Zn à l'avance, et d'une ailette non plaquée avec une composition de brasage, permet d'obtenir un faisceau d'échangeur thermique présentant une résistance à la corrosion et une capacité de brasage comparable ou supérieure à celle d'un élément homologue classique. On applique sur la surface extérieure d'un tube extrudé aplati (4) utilisé en tant que tube échangeur thermique, une composition de brasage dérivée d'un mélange de silicium et d'un flux de type fluor, et on prépare une ailette constituée d'un matériau à base d'aluminium contenant du zinc. Ensuite, on chauffe le tube extrudé aplati (4) et l'ailette (5) à une température donnée, de manière à les braser, et une couche de diffusion mixte en silicium et en zinc est alors ménagée sur la surface extérieure du tube extrudé aplati (5).

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