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Title:
HEAT EXCHANGER CONSTITUTED OF ALUMINUM ALLOY
Document Type and Number:
WIPO Patent Application WO/2011/108460
Kind Code:
A1
Abstract:
Disclosed is a heat exchanger constituted of an aluminum alloy and obtained by brazing aluminum-alloy tubes and aluminum-alloy fins in combination, the tubes having, formed on the surface thereof, a brazing coating film which comprises 1-5 g/m2 Si powder, 3-20 g/m2 Zn-containing flux, and 0.2-8.3 g/m2 binder, and the fins containing 0.8-2.0 mass% Mn, Si in amount of 1/2.5 to 1/3.5 the amount of the Mn, Fe in an amount less than 0.30 mass%, and Zn in an amount within the range surrounded by the points A, B, C, D, E, and F given in fig. 5 that shows a relationship with the content of the Zn-containing flux in the brazing coating film. The heat exchanger constituted of an aluminum alloy is characterized in that after the brazing, a fillet comprising a solid formed from a melt of the brazing coating film is formed between the tubes and the aluminum-alloy fins, and that in the fillet, a primary crystal part that bonds the fins to the tubes is formed and a eutectic part is formed as the part other than the primary crystal part, the primary crystal part having a potential equal to or higher than the potential of the aluminum-alloy fins.

Inventors:
HYOGO YASUNORI (JP)
YOSHINO MICHIHIDE (JP)
Application Number:
PCT/JP2011/054319
Publication Date:
September 09, 2011
Filing Date:
February 25, 2011
Export Citation:
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Assignee:
MITSUBISHI ALUMINIUM (JP)
HYOGO YASUNORI (JP)
YOSHINO MICHIHIDE (JP)
International Classes:
F28F21/08; B23K1/00; B23K35/22; B23K35/363; C22C21/00; B23K101/14; B23K103/10
Foreign References:
JP2009106947A2009-05-21
JP2009082971A2009-04-23
JPH11183085A1999-07-06
JP2010045734A2010-02-25
JP2004330233A2004-11-25
Other References:
See also references of EP 2543951A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
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Claims: