Flux composition

Patent metadata

Field	Value
Publication number	US-9844839-B2
Application number	US-201314438293-A
Country	US
Kind code	B2
Filing date	Oct 24, 2013
Priority date	Oct 26, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A flux composition includes a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by “M w Zn x Al y F z (1)” (wherein M is K or Cs, and w, x, y, and z are a positive integer, the greatest common divisor of w, x, y, and z being 1), the content of the component (A) in the flux composition being 50 mass % or more. The flux composition prevents occurrence of a brazing defect and discoloration even when an aluminum alloy is brazed in an atmosphere having a high oxygen concentration, or an atmosphere having high humidity.

First claim

The invention claimed is:

1. A flux composition comprising:
a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1), the content of the component (A) in the flux composition being 50 mass % or more,
M w Zn x Al y F z   (1)

wherein M is K or Cs, and w, x, y, and z are a positive integer, the greatest common divisor of w, x, y, and z being 1, and
a component (B) that is at least one powder selected from the group consisting of a powder of an alkali metal fluoroaluminate and a powder of an alkali metal fluorozincate.

2. A flux composition comprising:
a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1), the content of the component (A) in the flux composition being 50 mass % or more,
M w Zn x Al y F z   (1)

wherein M is K or Cs, and w, x, y, and z are a positive integer, the greatest common divisor of w, x, y, and z being 1, and
a component (C) that is at least one metal powder selected from the group consisting of a powder of an aluminum alloy an Al powder, an Si powder, a Cu powder, and a Zn powder, the aluminum alloy comprising at least one metal element selected from the group consisting of Si, Cu, and Zn.

3. A flux composition comprising a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by the general formula (1), a component (B) that is one type of powder or two or more types of powders selected from a powder of an alkali metal fluoroaluminate and a powder of an alkali metal fluorozincate, and a component (C) that is at least one metal powder selected from the group consisting of a powder of an aluminum alloy, an Al powder, an Si powder, a Cu powder, and a Zn powder, the aluminum alloy comprising at least one metal element selected from the group consisting of Si, Cu, and Zn.

4. The flux composition according to claim 1 , having an average particle size of 80 μm or less.

5. A mixture comprising the flux composition according to claim 1 , and an organic resin binder.

6. A mixture comprising the flux composition according to claim 2 , and an organic resin binder.

7. A mixture comprising the flux composition according to claim 3 , and an organic resin binder.

Assignees

• Uacj Corp

Inventors

• Kumagai Hidetoshi
• Hisatomi Yuji
• Yamashita Naoki

Classifications

• B23K2101/006

  Vehicles · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• B23K35/36

  Selection of non-metallic compositions, e.g. coatings or fluxes (B23K35/34 takes precedence); Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest · CPC title

• B23K35/0244

  Powders, particles or spheres; Preforms made therefrom · CPC title

• B23K35/30

  with the principal constituent melting at less than 1550°C · CPC title