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Title:
ALUMINIUM BRAZING SHEET
Document Type and Number:
WIPO Patent Application WO/2011/034496
Kind Code:
A3
Abstract:
A multi layered aluminium alloy brazing sheet consisting of: a core material that on either one or both sides has an intermediate layer consisting of an Al-Si braze alloy interposed between the core and a thin covering layer on top of the intermediate layer, where the said core material and the covering layer has a higher melting temperature than the Al-, braze alloy, the covering layer containing Bi 0.01 to 1.0wt-%, Mg ≤0.01wt-%, Mn ≤1.0 wt-%, Cu≤1.2 wt-%,Fe ≤1.0 wt-%, Si ≤4.0wt-%,Ti ≤0.1 wt-%, Zr,Cr, V and/or Sc in total ≤0.2%, and unavoidable impurities each in amounts less than 0.05wt-%,and a total impurity content of less than 0.2wt-%, the balance consisting of aluminium; and a heat exchanger comprising the alloy brazing sheet.

Inventors:
ABRAHAMSSON DAVID (SE)
WESTERGAARD RICHARD (SE)
STENQVIST TORKEL (SE)
Application Number:
PCT/SE2010/050998
Publication Date:
July 07, 2011
Filing Date:
September 17, 2010
Export Citation:
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Assignee:
SAPA HEAT TRANSFER AB (SE)
ABRAHAMSSON DAVID (SE)
WESTERGAARD RICHARD (SE)
STENQVIST TORKEL (SE)
International Classes:
B23K35/00; B23K35/02; B23K35/28; B23K35/38; B32B15/01; C22C21/02; F28F21/08
Domestic Patent References:
WO2008155067A12008-12-24
WO2010000666A12010-01-07
Foreign References:
EP1306207B12007-01-03
US3917151A1975-11-04
Other References:
NYLEN M ET AL: "Mechanistic studies of brazing in clad aluminium alloys", MATERIALS SCIENCE FORUM, AEDERMANNSFDORF, CH, vol. 217-222, 1 January 1996 (1996-01-01), pages 1703 - 1708, XP008085608, ISSN: 0255-5476
Attorney, Agent or Firm:
MELIN GRANBERG, Linda et al. (Box 6107, Stockholm, SE)
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