BRAZING SHEET FOR FLUXLESS BRAZING, FLUXLESS BRAZING METHOD, AND HEAT EXCHANGER MANUFACTURING METHOD

Title:

BRAZING SHEET FOR FLUXLESS BRAZING, FLUXLESS BRAZING METHOD, AND HEAT EXCHANGER MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2018/123203

Kind Code:

A1

Abstract:

A brazing sheet for fluxless brazing characterized in that an outermost brazing material layer comprising an Al-Si alloy containing 2–13% Si by mass and an intermediate brazing material layer comprising an Al-Si-Mg alloy containing 4–13% Si and 0.1–5.0% Mg are clad on one or both surfaces of a core material, when viewed in the surface layer direction the ratio of the Si particles having a diameter of 1.75 μm or greater among those having a circle-equivalent diameter of 0.8 μm or greater is 10% or greater, and in a cross-sectional view of the brazing material layer the Si particles contained in the intermediate brazing material layer and having a circle-equivalent diameter of 0.25 μm or greater is less than 3,000 per 10,000 μm2. The brazing sheet is used in a non-oxidizing gas atmosphere having an oxygen concentration of 100 ppm or less at atmospheric pressure to join aluminum pieces to each other without using a flux.

Inventors:

MIYAKE HIDEYUKI (JP)

Application Number:

PCT/JP2017/036921

Publication Date:

July 05, 2018

Filing Date:

October 12, 2017

Export Citation:

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Assignee:

MITSUBISHI ALUMINIUM (JP)

International Classes:

B23K35/28; B23K1/19; B23K35/14; B32B15/20; C22C21/00; B23K101/14; B23K103/10

Domestic Patent References:

WO2010000666A1

2010-01-07

Foreign References:

JP2014155955A	2014-08-28
JP4547032B1	2010-09-22
JP2015528852A	2015-10-01
JP2014037576A	2014-02-27
JP6055573B1	2016-12-27

Other References: