Flux composition and brazing sheet

Patent metadata

Field	Value
Publication number	US-10086480-B2
Application number	US-201214347080-A
Country	US
Kind code	B2
Filing date	Oct 17, 2012
Priority date	Oct 26, 2011
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Disclosed is a flux composition for use in brazing of an aluminum alloy material and includes a flux component [A] containing KAlF 4 ; and a fluoride [B] containing an element other than Group 1 elements and Group 2 elements and containing no potassium (K). Also disclosed is a brazing sheet which includes an aluminum alloy core; a filler material lying on or over at least one side of the core; and a flux layer lying on or over one side of the filler material and including the flux composition.

First claim

The invention claimed is:

1. A flux composition, consisting of:
a flux component consisting of KAlF 4 and at least one of K 2 AlF 5 and K 2 (AlF 5 )(H 2 O); and
AlF 3 ;
wherein the AlF 3 is present in an amount of at least 3 parts by mass per 100 parts by mass of the flux component.

2. The flux composition according to claim 1 , wherein the composition has a melting point of 580° C. or lower.

3. A flux composition, consisting of:
particles consisting of KAlF 4 and at least one of K 2 AlF 5 and K 2 (AlF 5 )(H 2 O); and
particles consisting of AlF 3 ;
wherein the AlF 3 is present in an amount of at least 3 parts by mass per 100 parts by mass of the flux component.

4. The flux composition according to claim 1 , wherein the AlF 3 is present in an amount of up to 200 parts by mass per 100 parts by mass of the flux component.

5. A flux composition, consisting of:
a flux component consisting of KAlF 4 and at least one of K 2 AlF 5 and K 2 (AlF 5 )(H 2 O);
AlF 3 ; and
at least one melting-point-lowering agent selected from the group consisting of NaF and LiF;
wherein the AlF 3 is present in an amount of at least 3 parts by mass per 100 parts by mass of the flux component.

6. The flux composition according to claim 5 , wherein the melting-point-lowering agent is present in an amount of from 0.1 part by mass to 30 parts by mass per 100 parts by mass of the flux component.

7. A brazing sheet comprising:
a core comprising an aluminum alloy;
a filler material lying on or over a side of the core; and
a flux layer lying on or over one side of the filler material and comprising the flux composition according to claim 1 .

8. The brazing sheet according to claim 7 , wherein the flux composition constituting the flux layer is present in a mass of deposition of from 0.5 g/m 2 to 100 g/m 2 in terms of solids content.

9. The brazing sheet according to claim 7 , wherein the aluminum alloy comprises magnesium.

10. A method, comprising brazing an aluminum alloy material with the flux composition according to claim 1 .

Assignees

• Kobe Steel Ltd
• Denso Corp

Inventors

• Kobayashi Nobuhiro
• Horiguchi Motohiro
• Sakamoto Koichi
• Ueda Toshiki
• Kimura Shimpei
• Izumi Takahiro

Classifications

• B23K1/203

  Fluxing, i.e. applying flux onto surfaces · CPC title

• B23K35/362

  Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) · CPC title

• B23K2103/10

  Aluminium or alloys thereof · CPC title

• B23K35/361

  Alumina or aluminates · CPC title

• B23K35/0233

  Sheets or foils (B23K35/0244 takes precedence) · CPC title