ALUMINUM BRAZING SHEET FOR FLUX-FREE BRAZING

Title:

ALUMINUM BRAZING SHEET FOR FLUX-FREE BRAZING

Document Type and Number:

WIPO Patent Application WO/2020/152912

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. 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.

Inventors:

MORI YOSHIKI (JP)
MIYAKE HIDEYUKI (JP)
YOSHINO MICHIHIDE (JP)
IWAO SHOHEI (JP)
EDO MASAKAZU (JP)

Application Number:

PCT/JP2019/037647

Publication Date:

July 30, 2020

Filing Date:

September 25, 2019

Export Citation:

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Assignee:

MITSUBISHI ALUMINIUM (JP)

International Classes:

B23K35/22; B23K35/28; C22C21/00

Domestic Patent References:

WO2018216773A1

2018-11-29

Foreign References:

JP2014050861A	2014-03-20
JP4547032B1	2010-09-22
JP2012050992A	2012-03-15
JP2014050861A	2014-03-20

Other References: