ALUMINUM ALLOY BRAZING METHOD, AND ALUMINUM ALLOY MEMBER COVERED WITH FLUX COMPONENT

• US 20150273635A1
• Filed: 10/24/2013
• Published: 10/01/2015
• Est. Priority Date: 10/26/2012
• Status: Active Application

• Current Assignee: UACJ Corporation
• Original Assignee: UACJ Corporation
• Inventors: Hisatomi, Yuji, Yamashita, Naoki, Kumagai, Hidetoshi
• Application Number:
  US14/438,402
• Publication Number:
  US 20150273635A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23K 1/0012 Brazing heat exchangers
• CPC Class Codes: B23K 1/012 Soldering with the use of hot gas
• CPC Class Codes: B23K 1/19 taking account of the properties of the materials to be soldered
• CPC Class Codes: B23K 1/203 Fluxing, i.e. applying flux onto surfaces
• CPC Class Codes: B23K 2101/006 Vehicles
• CPC Class Codes: B23K 2101/14 Heat exchangers
• CPC Class Codes: B23K 2103/10 Aluminium or alloys thereof
• CPC Class Codes: B23K 3/087 Soldering or brazing jigs, fixtures or clamping means
• CPC Class Codes: B23K 35/0222 for use in soldering, brazing B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/0244 Powders, particles or spheres; Preforms made therefrom
• CPC Class Codes: B23K 35/28 with the principal constituent melting at less than 950 degrees C
• CPC Class Codes: B23K 35/286 Al as the principal constituent
• CPC Class Codes: B23K 35/36 Selection of non-metallic compositions, e.g. coatings, fluxes B23K35/34 takes precedence; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest selection of soldering or welding materials proper B23K35/24
• CPC Class Codes: B23K 35/3601 with inorganic compounds as principal constituents
• CPC Class Codes: B23K 35/3605 Fluorides
• CPC Class Codes: B23K 35/361 Alumina or aluminates
• CPC Class Codes: B23K 35/3612 with organic compounds as principal constituents
• CPC Class Codes: B23K 35/3618 Carboxylic acids or salts
• CPC Class Codes: B23K 35/362 Selection of compositions of fluxes B23K35/365, B23K35/368 take precedence
• CPC Class Codes: Y10T 428/12056 Entirely inorganic
• CPC Class Codes: Y10T 428/25 : Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/273 : of coating

Abstract

A method for brazing an aluminum alloy includes applying a flux component to a surface of an aluminum alloy member, and brazing the aluminum alloy member to which the flux component has been applied, the flux component being a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by “M_wZn_xAl_yF_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 component (A) being applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m². A 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.

Claims

1. A method for brazing an aluminum alloy comprising applying a flux component to a surface of an aluminum alloy member, and brazing the aluminum alloy member to which the flux component has been applied,

the flux component being a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1),

M_wZn_xAl_yF_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

the component (A) being applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m².

4. The method for brazing an aluminum alloy according to claim 1, wherein the flux component has an average particle size of 80 μ

m or less.

5. The method for brazing an aluminum alloy according to claim 1, comprising applying a component (C) to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder,

the component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

15. The method for brazing an aluminum alloy according to claim 4, comprising applying a component (C) to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder,

the component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

2. A method for brazing an aluminum alloy comprising applying a flux component to a surface of an aluminum alloy member, and brazing the aluminum alloy member to which the flux component has been applied,

the flux component being a mixture of a component (A) and a flux component other than the component (A), the component (A) being a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1),

M_wZn_xAl_yF_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 component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the component (A) and the flux component other than the component (A), and

the component (A) and the flux component other than the component (A) being applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m² in total.

11. The method for brazing an aluminum alloy according to claim 2, wherein the flux component has an average particle size of 80 μ

m or less.

13. The method for brazing an aluminum alloy according to claim 2, comprising applying a component (C) to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder,

the component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

3. A method for brazing an aluminum alloy comprising applying a flux component to a surface of an aluminum alloy member, and brazing the aluminum alloy member to which the flux component has been applied,

the flux component being a mixture of a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1), and 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,

M_wZn_xAl_yF_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 component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the component (A) and the component (B), and

the component (A) and the component (B) being applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m² in total.

12. The method for brazing an aluminum alloy according to claim 3, wherein the flux component has an average particle size of 80 μ

m or less.

14. The method for brazing an aluminum alloy according to claim 3, comprising applying a component (C) to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder,

the component (A) being applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

6. A flux component-coated aluminum alloy member comprising an aluminum alloy member and a flux component, the flux component having been applied to a surface of the aluminum alloy member,

the flux component being a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1),

M_wZn_xAl_yF_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

the component (A) having been applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m².

9. The flux component-coated aluminum alloy member according to claim 6, wherein the flux component has an average particle size of 80 μ

m or less.

10. The flux component-coated aluminum alloy member according to claim 6, a component (C) having been applied to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder, and

the component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

20. The flux component-coated aluminum alloy member according to claim 9, a component (C) having been applied to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder, and

the component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

7. A flux component-coated aluminum alloy member comprising an aluminum alloy member and a flux component, the flux component having been applied to a surface of the aluminum alloy member,

the flux component being a mixture of a component (A) and a flux component other than the component (A), the component (A) being a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1),

M_wZn_xAl_yF_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 component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the component (A) and the flux component other than the component (A), and

the component (A) and the flux component other than the component (A) having been applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m² in total.

16. The flux component-coated aluminum alloy member according to claim 7, wherein the flux component has an average particle size of 80 μ

m or less.

18. The flux component-coated aluminum alloy member according to claim 7, a component (C) having been applied to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder, and

the component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).

8. A flux component-coated aluminum alloy member comprising an aluminum alloy member and a flux component, the flux component having been applied to a surface of the aluminum alloy member,

the flux component being a mixture of a component (A) that is a powder of an alkali metal zinc fluoroaluminate represented by a general formula (1), and 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,

M_wZn_xAl_yF_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 component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the component (A) and the component (B), and

the component (A) and the component (B) having been applied to the surface of the aluminum alloy member in an amount of 1 to 50 g/m² in total.

17. The flux component-coated aluminum alloy member according to claim 8, wherein the flux component has an average particle size of 80 μ

m or less.

19. The flux component-coated aluminum alloy member according to claim 8, a component (C) having been applied to the surface of the aluminum alloy member together with the flux component, the component (C) being one type of metal powder or two or more types of metal powders selected from a powder of an aluminum alloy that comprises one type of metal element or two or more types of metal elements among Si, Cu, and Zn, an Al powder, an Si powder, a Cu powder, and a Zn powder, and

the component (A) having been applied to the surface of the aluminum alloy member in a ratio of 50 mass % or more with respect to the total amount of the flux component and the component (C).