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Multi-layer flux-cored silver solder and preparation method thereof

A technology of silver solder and flux core, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of insufficient gap filling and fast flow, achieve good gap filling and fast flow, and improve filling Seam performance and flow performance, and the effect of improving continuity

Pending Publication Date: 2021-07-09
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-layer silver cored solder, which solves the problem of insufficient gap filling and rapid flow properties of the existing silver cored solder

Method used

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  • Multi-layer flux-cored silver solder and preparation method thereof
  • Multi-layer flux-cored silver solder and preparation method thereof
  • Multi-layer flux-cored silver solder and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0037] The preparation method of above-mentioned multi-layer flux-cored silver solder comprises the following steps:

[0038] Step 1. According to the mass fraction and mass ratio of the alloy wire, calculate the mass fraction of Ga particles, Sn block, and In foil raw materials and weigh them respectively. First, put Sn in a graphite crucible and heat it to a certain temperature. Sn is melted into For molten metal, wrap Ga grains with In foil and press into the bottom of the molten metal with a bell jar, stir with a glass rod until it is completely melted and mixed evenly, then cast into the mold cavity, and cool to obtain an alloy ingot;

[0039]Step 2, extruding and drawing the alloy ingot to obtain a fixed-ratio alloy wire with a certain diameter;

[0040] Step 3: Weigh the silver brazing flux powder in parts by mass, configure the silver brazing flux powder and polyethylene glycol-400 binder to form a paste brazing flux, and apply the paste brazing flux evenly on the allo...

Embodiment 1

[0051] The multi-layer flux-cored silver solder of this embodiment includes an inner core layer, an intermediate layer attached to the surface of the inner core layer, and an outermost layer wrapped on the intermediate layer.

[0052] The three-layer components of the multi-layer flux-cored silver solder are composed in parts by weight: 5 parts for the inner core layer, 6 parts for the middle layer, and 70 parts for the outermost layer.

[0053] The inner core layer is Ga-Sn-In alloy wire (fixed ratio alloy wire), and the mass ratio of Ga, Sn, and In in Ga-Sn-In alloy wire is 8:12:1.

[0054] The middle layer is a silver flux layer, which is composed of silver flux and polyethylene glycol-400 binder in a mass ratio of 90:10. The silver brazing flux is composed of sodium fluoride, potassium fluoroborate and boric anhydride in a mass ratio of 20:45:35.

[0055] The outermost layer is a silver-based solder metal skin, consisting of the following components by weight: 5 parts of ...

Embodiment 2

[0058] The multilayer flux-cored silver solder of the present embodiment differs from the introduction of embodiment 1 in that the parts by weight of the three-layer components of the multilayer flux-cored silver solder consist of: 6 parts of the inner core layer, 7 parts of the middle layer parts, the outermost layer is 75 parts.

[0059] Wherein, the components by weight of the outermost silver-based solder metal skin consist of: 10 parts of Ag, 40 parts of Cu, 30 parts of Zn, 1.5 parts of Ni, 1.2 parts of Mn, 0.1 part of Si, 0.1 part of Li, P0.1 share.

[0060] The diameter of the fixed-ratio alloy wire is 1.5mm; the fixed-ratio alloy wire and the silver brazing flux layer form the coated alloy wire, and the diameter of the coated alloy wire is determined by its mass fraction.

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Abstract

The invention belongs to the technical field of soldering materials, and particularly relates to a multi-layer flux-cored silver solder and a preparation method thereof. The multi-layer flux-cored silver solder comprises an inner core layer, a middle layer attached to the surface of the inner core layer and an outermost layer wrapped on the middle layer. The inner core layer is an alloy wire, the middle layer is a silver soldering flux layer, and the outermost layer is a silver-based solder metal skin. And the melting point of the alloy wire is lower than that of the silver soldering flux layer. According to the multi-layer flux-cored silver solder, the melting temperature of the alloy wire of the core part is lower than that of soldering flux, in the soldering process, the alloy wire is firstly melted and then adheres to the soldering flux, the soldering flux is driven to flow out in advance and permeate into a soldering seam, and therefore the seam filling performance and flowing performance of the soldering flux are improved. The problems that conventional flux-cored silver solder is poor in fluidity and not prone to seam crossing during soldering, and the soldering flux is accumulated on the front face during soldering are solved, and therefore the soldering effect is improved.

Description

technical field [0001] The invention belongs to the technical field of brazing materials, and in particular relates to a multilayer flux-cored silver solder and a preparation method thereof. Background technique [0002] When brazing with traditional silver solder, the solder and the flux are usually used separately, that is, the solder needs to be dipped in the flux for use during brazing or the flux is pre-coated on the position of the workpiece to be welded. This transfer brazing method increases a pre-soldering process and operating time, and adds a variable that affects welding consistency and quality stability. In order to ensure the quality of brazing, excessive flux has to be added. Excessive flux not only pollutes the air, but also requires a large amount of clear water to clean after welding. In order to improve the use efficiency of flux, reduce water pollution, and improve the brazing working environment, flux-cored silver solder and coated silver solder have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/14B23K35/30B23K35/40
CPCB23K35/0227B23K35/3006B23K35/40
Inventor 龙伟民钟素娟黄俊兰裴夤崟纠永涛张冠星周许升李文彬
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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