Brazing sheet comprising an a1-mg-si alloy brazing material

B - Operations – Transporting – 23 – K

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Details

B23K 35/22 (2006.01) B23K 35/28 (2006.01) B32B 15/20 (2006.01) B23K 35/02 (2006.01)

Patent

CA 2054193

A brazing sheet having an Al alloy core material one or each of whose surfaces is clad with a brazing material, the brazing sheet being excellent in vacuum brazing ability suitable for the manufacture of aluminum heat exchangers that have a hollow structure. The brazing material is an Al-Mg-Si alloy brazing material comprising 0.6 to 1.8 wt% of Mg, 0.6 to 20.0 wt% of Si, and the balance of Al and inevitahle impurities, and having, in its metal texture, 1,000/mm2 or more Mg2Si particles 2 to 5 µm in diameter, with the particles being assumed to be spheres, and 3,000/mm2 or more Si particles 6 µm or less in diameter, with the particles being assumed to be spheres.

La présente invention vise une tôle de brasage dont le coeur est fait de matériau d'alliage Al revêtu sur au moins un côté d'un matériau de brasage fort, la tôle de brasage ayant une excellente aptitude au brasage fort sous vide utilisé dans la fabrication d'échangeurs de chaleur en aluminium à structure creuse. Le matériau de brasage employé est un alliage Al-Mg-Si composé de 0,6 à 1,8 % poids de Mg, de 0,6 à 20,0 % poids de Si, et de Al pour le reste, sans compter les impuretés incontournables, et englobant dans ses constituants métalliques 1000/mm2 ou plus de particules de Mg2Si de 2 à 5 µm de diamètre, les particules étant présumées sphériques, et 3000/mm2 ou plus de particules de Si de 6 µm ou moins de diamètre, ces particules étant également présumées sphériques.

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