Brazing aluminum alloy powder composition and brazing method using such powder composition

• US 6,113,667 A
• Filed: 12/11/1997
• Issued: 09/05/2000
• Est. Priority Date: 12/14/1996
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Aluminum Kabushiki Kaisha
• Original Assignee: Mitsubishi Aluminum Kabushiki Kaisha
• Inventors: Tohma, Ken, Momosaki, Hiroto, Hyogo, Yasunori
• Primary Examiner(s): WYSZOMIERSKI, GEORGE P
• Application Number:
  US08/989,228
• Time in Patent Office: 999 Days
• Field of Search: 75/252, 75/255, 148/437, 420/540, 420/548, 420/578
• US Class Current: 75/255
• CPC Class Codes: B23K 35/0244 Powders, particles or spheres; Preforms made therefrom
• CPC Class Codes: B23K 35/025 Pastes, creams, slurries
• CPC Class Codes: B23K 35/288 with Sn or Zn
• CPC Class Codes: B23K 35/30 with the principal constituent melting at less than 1550 degrees C
• CPC Class Codes: B23K 35/3603 Halide salts
• CPC Class Codes: F28F 9/18 by welding

Abstract

A brazing powder comprises a single powder or mixture powder that is composed of one or more type of elements consisting of Al, Si and Zn, having the composition of Al--Si--Zn hypereutectic alloy in terms of the total amount. The brazing powder comprises above 15% but up to 60% by weight of Si and 5% to 30% by weight of Zn.

Claims

1. A brazing aluminum alloy powder composition comprising a powder or mixture of powders of Al, Si and Zn which form an Al--Si--Zn hypereutectic alloy composition, wherein the Si is present in an amount of more than 15 and up to 60% by weight, based on the weight of the powder composition, the Zn is present in an amount of 5 to 30% by weight, based on the weight of the powder composition and the balance is Al.

2. The brazing aluminum alloy powder composition of claim 1, comprising a powder is selected from the group consisting of Al--Si alloy, Al--Si--Zn alloy, Al--Zn alloy, Si, and Zn.

3. The brazing aluminum alloy powder composition of claim 1, wherein the powder comprises a mixture composed of Al--Si--Zn hypereutectic alloy powder and Si powder.

4. The brazing aluminum alloy powder composition of claim 3, wherein said Al--Si--Zn hypereutectic alloy powder has an average grain size in the range of 5 to 100 μ

m and said Si powder has an average grain size in the range of 1 to 50 μ

m, the grain size for said Al--Si--Zn ternary hypereutectic alloy powder being larger than that of said Si powder.

5. The brazing aluminum alloy powder composition of claim 1, further comprising a brazing flux in a powdery form.

6. The brazing aluminum alloy powder composition of claim 1, wherein the Zn is present in an amount of 15 to 30%.