The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2005
Filed:
Jul. 25, 2002
Yoshiharu Hasegawa, Obu, JP;
Koji Hirao, Tokai, JP;
Hiroshi Nishikawa, Nishio, JP;
Yasunaga Itoh, Nagoya, JP;
Naoki Yamashita, Nagoya, JP;
Shinichi Tani, Nagoya, JP;
Keiichi Sakai, Nagoya, JP;
Eiichi Kashima, Nagoya, JP;
Yoshiharu Hasegawa, Obu, JP;
Koji Hirao, Tokai, JP;
Hiroshi Nishikawa, Nishio, JP;
Yasunaga Itoh, Nagoya, JP;
Naoki Yamashita, Nagoya, JP;
Shinichi Tani, Nagoya, JP;
Keiichi Sakai, Nagoya, JP;
Eiichi Kashima, Nagoya, JP;
Denso Corporation, Kariya, JP;
Sumitomo Light Metal Industries, Ltd., Tokyo, JP;
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.