Title:
ALUMINUM BRAZING SHEET FOR FLUX-FREE BRAZING
Document Type and Number:
WIPO Patent Application WO/2020/129267
Kind Code:
A1
Abstract:
Provided is an aluminum brazing sheet for flux-free brazing, the aluminum brazing sheet being used for brazing without using a flux in a non-oxidizing atmosphere which does not involve depressurization, wherein an Al-Si-Mg-Bi-based brazing material containing, in mass%, 0.01-2.0% of Mg, 1.5-14.0% of Si, and 0.005-1.5% of Bi is clad on one or both surfaces of a core material and located on the outermost surface thereof. For an Mg-Bi-based compound contained in the Al-Si-Mg-Bi-based brazing material, the number of the Mg-Bi-based compound having a Heywood's diameter of at least 0.01 μm and less than 5.0 μm is greater than 10 per 10000 μm2 field of view, and the number of the Mg-Bi-based compound having a Heywood's diameter of at least 5.0 μm is less than 2 per 10000 μm2 field of view, as observed in the surface layer direction before brazing. For particles of elemental Bi contained in the brazing material, the number of the particles having a Heywood's diameter of at least 5.0 μm is less than 5 per 10000 μm2 field of view as observed in the surface layer direction before brazing.
Inventors:
MORI YOSHIKI (JP)
MIYAKE HIDEYUKI (JP)
YOSHINO MICHIHIDE (JP)
IWAO SHOHEI (JP)
EDO MASAKAZU (JP)
MIYAKE HIDEYUKI (JP)
YOSHINO MICHIHIDE (JP)
IWAO SHOHEI (JP)
EDO MASAKAZU (JP)
Application Number:
PCT/JP2019/002119
Publication Date:
June 25, 2020
Filing Date:
January 23, 2019
Export Citation:
Assignee:
MITSUBISHI ALUMINIUM (JP)
International Classes:
B23K35/28; B23K35/22; C22C21/00
Foreign References:
| JP2014050861A | 2014-03-20 | |||
| JP4547032B1 | 2010-09-22 | |||
| JP2012050992A | 2012-03-15 |
Attorney, Agent or Firm:
YOKOI Koki (JP)
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