ALUMINUM ALLOY BRAZING SHEET

Title:

ALUMINUM ALLOY BRAZING SHEET

Document Type and Number:

WIPO Patent Application WO/2017/010287

Kind Code:

A1

Abstract:

An aluminum alloy brazing sheet which: has a brazing filler metal that contains Si in the amount of 6-13%, with Al and inevitable impurities constituting the remainder thereof, and is provided on one or both surfaces of a core material comprising pure aluminum or an aluminum alloy; has an intermediate material that contains Bi in the amount of 0.01-1.5% and Si in the amount of 1.5-13%, with Al and inevitable impurities constituting the remainder thereof, and is interposed and cladded between the core material and the brazing filler metal, with the thickness of the intermediate material constituting 2-35% of the thickness of the brazing filler metal; and is to be used in order to braze aluminum without using a flux in a vacuum or inert gas atmosphere. Furthermore, the aluminum alloy brazing sheet is characterized in that the intermediate material and/or core material contain Mg in the amount of 0.4-6%. This invention makes it possible to provide an aluminum alloy brazing sheet capable of achieving excellent brazing properties, by quickly supplying Bi and Mg into the brazing filler metal while heating for brazing, causing elution of these elements into the molten brazing metal after the brazing filler metal starts to melt, and effectively embrittling an oxide film on the brazing filler metal surface.

Inventors:

ITOH YASUNAGA (JP)
YAMAYOSHI TOMOKI (JP)
YANAGAWA YUTAKA (JP)

Application Number:

PCT/JP2016/069255

Publication Date:

January 19, 2017

Filing Date:

June 29, 2016

Export Citation:

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Assignee:

UACJ CORP (JP)

International Classes:

C22C21/00; B23K35/22; B23K35/28

Foreign References:

JP2012236201A	2012-12-06
JPS55104452A	1980-08-09
JP2015030861A	2015-02-16

Other References: