Title:
METHOD FOR FLUX-FREE SOLDERING OF ALUMINUM ALLOY, AND SOLDER PASTE
Document Type and Number:
WIPO Patent Application WO/2023/045083
Kind Code:
A1
Abstract:
A method for flux-free soldering of aluminum alloy, comprising the following steps: (1) galvanizing a surface to be soldered of aluminum alloy to form a galvanized layer; (2) coating the galvanized layer with a flux-free solder paste, the flux-free solder paste consisting of a binder and the following components in parts by weight: 70-80 parts of a zinc-aluminum solder and 6.0-8.0 parts of rubidium-iron-boron magnetic particles; and (3) heating a part to be soldered, so that the galvanized layer and the zinc-aluminum solder form a eutectic or near-eutectic solder liquid, and applying a rotating magnetic field, so that the rubidium-iron-boron magnetic particles spin under the action of the rotating magnetic field and aluminum alloy is soldered and connected in the absence of a flux. In the method, a galvanized layer and a solder layer are diffused under the action of a concentration gradient, and then flux-free soldering of aluminum alloy is achieved under the action of spin-breaking and flow promoting of strong magnetic particles; a resulting soldering joint has fewer inclusion and air hole defects, a dense soldering seam, and high joint strength. Also disclosed is a solder paste for flux-free soldering.
Inventors:
ZHONG SUJUAN (CN)
LONG WEIMIN (CN)
HUANG JUNLAN (CN)
CHENG YAFANG (CN)
PEI YINYIN (CN)
LU QUANBIN (CN)
XUE HANGYAN (CN)
NIE MENGJIE (CN)
LONG WEIMIN (CN)
HUANG JUNLAN (CN)
CHENG YAFANG (CN)
PEI YINYIN (CN)
LU QUANBIN (CN)
XUE HANGYAN (CN)
NIE MENGJIE (CN)
Application Number:
PCT/CN2021/135210
Publication Date:
March 30, 2023
Filing Date:
December 03, 2021
Export Citation:
Assignee:
ZHENGZHOU RES INST MECHANICAL ENG CO LTD (CN)
International Classes:
B23K3/06; B23K1/002
Domestic Patent References:
| WO1993008952A1 | 1993-05-13 |
Foreign References:
| CN113732422A | 2021-12-03 | |||
| CN109465564A | 2019-03-15 | |||
| CN112621010A | 2021-04-09 | |||
| US20210183545A1 | 2021-06-17 |
Attorney, Agent or Firm:
ZHENGZHOU RUIXIN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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