Metal treatment – Compositions – Fluxing
Reexamination Certificate
2005-02-01
2005-02-01
Jenkins, Daniel (Department: 1742)
Metal treatment
Compositions
Fluxing
C228S246000, C228S252000, C228S254000, C228S262510
Reexamination Certificate
active
06849136
ABSTRACT:
An object of the present invention is to provide a filler metal for an aluminum brazing sheet for heat exchangers capable of preventing or controlling occurrence of a melting hole during heating for brazing, and a method of manufacturing the same. In an Al—Si alloy filler metal which is clad on the aluminum brazing sheet and melted during heating for brazing, the maximum particle diameter of a coarse Si particle crystallized in the eutectic structure of the filler metal is 20 μm or less. Provided that an average value and a standard deviation in a normal distribution of the particle diameter of the coarse Si particle in the filler metal are respectively μ and σ, (μ+3σ) is preferably 10 μm or less. This brazing sheet is obtained by a method of adding a specific amount of Na, Sr, or Sb to the filler metal, a method of limiting the amount of impurities in the filler metal within a specific range, a method of specifying a cooling rate during the casting of the filler metal, or the like.
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Hasegawa Yoshiharu
Hirao Koji
Itoh Yasunaga
Kashima Eiichi
Nishikawa Hiroshi
Denso Corporation
Flynn ,Thiel, Boutell & Tanis, P.C.
Jenkins Daniel
Sumitomo Light Metal Industries Ltd.
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