Toyo Aluminium Kabushiki Kaisha

Ken Matsumura

Takashi Watsuji

Haruzo Katoh

Ken Kikuchi

Haruzou Katou

Provided are a pasty composition for aluminum brazing which has excellent coating properties, is capable of attaining favorable dimensional accuracy of products obtained after brazing, causes less erosion, and allows favorable external appearances of brazed portions (fillets); an aluminum-containing member coated with the pasty composition for aluminum brazing; and a method, using the pasty composition for aluminum brazing, for brazing the aluminum-containing members. The pasty composition for aluminum brazing contains an aluminum-containing powder. In a case where on a cumulative grading curve of the aluminum-containing powder, a particle diameter D &#x3bc;m which corresponds to a Q volume % is indicated as D(Q) &#x3bc;m, D(50) &#x3bc;m is greater than or equal to 20 &#x3bc;m and less than or equal to 150 &#x3bc;m; and D(90) &#x3bc;m/D(10) &#x3bc;m is less than or equal to 5. A mass percentage of particles, in the aluminum-containing powder, which pass through a screen mesh having an opening of 45 &#x3bc;m is less than or equal to 50%. A flowability of the aluminum-containing powder is less than or equal to 80 seconds/50 g.

Pasty composition for aluminum brazing, aluminum-containing member coated with the same, and method for brazing aluminum-containing members with the same

A flux-containing composition for brazing aluminum containing a fluoride flux, a binder of an alkyd resin, a mixture of an acrylic resin and a butyl rubber (or a petroleum resin), and/or a polyethylene resin, an organic solvent, and optionally a metallic powder for brazing is easy for handling and plastic working of a product coated with it, gives brazed areas (fillets) of good appearance, has low cost and better operating environment, and is capable of application to members having complicated shapes.

Flux-containing compositions for brazing aluminum, films and brazing method thereby

A flux composition for brazing aluminum, comprising a fluoride flux, at least one selected from a butyl rubber and a petroleum resin, and a solvent. The novel flux composition has excellent processing properties and provides brazed areas (fillets) with good appearance.

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Osaka, Japan

Ken Matsumura