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Brazing filler metal and preparation method and application thereof

A brazing material and raw material technology, which is applied in the field of brazing material and its preparation, can solve problems such as easy volatilization of zinc and difficulty in processing silver-copper-zinc solder, and achieve the effects of low silver content, increased strength, and reduced cost

Pending Publication Date: 2022-05-17
CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a kind of brazing filler metal, to solve the problem that the traditional silver-copper-zinc brazing filler metal is difficult to process because of the high zinc content, and at the same time solve the problem that the brazing filler metal is easy to zinc during brazing. The problem of volatilization, the solder of the present invention has low silver content at the same time, has good economic benefits and higher brazed joint strength

Method used

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  • Brazing filler metal and preparation method and application thereof
  • Brazing filler metal and preparation method and application thereof
  • Brazing filler metal and preparation method and application thereof

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preparation example Construction

[0085] According to another aspect of the present invention, the present invention also relates to the preparation method of described solder, comprising the following steps:

[0086] Coating a zinc layer on the surface of the brazing material core material, and spraying a coating layer on the surface of the zinc layer;

[0087] Preferably, the preparation method of the solder core material includes: smelting, casting and molding the raw material mixture of the solder core material.

[0088] In one embodiment, said forming includes extrusion and drawing.

[0089] In one embodiment, said forming includes extrusion, drawing and ring making.

[0090] In one embodiment, said forming is rolling.

[0091] Preferably, spraying the coating layer on the surface of the zinc layer includes the following steps: mixing raw materials of the coating layer with an organic solvent to prepare a coating solution, spraying the coating solution on the surface of the zinc layer and drying.

[00...

Embodiment 1

[0154] A preparation method of solder, comprising the steps of:

[0155] (a) According to the mass percentage of Ag 15.56%, Cu 54.44%, and Zn 30%, the raw materials are added into the intermediate frequency smelting crucible, and a strip-shaped silver-copper-zinc solder with a diameter of 3mm is obtained through smelting, casting, extrusion, and drawing; Put the silver-copper-zinc solder into the ultrasonic cleaning equipment, add metal cleaning agent, and degrease and clean the surface of the solder;

[0156] (b) Electroplating Zn coating

[0157] Submerge the cleaned solder in step (a) in an acid solution at about 30°C for 5 minutes, then place the treated silver-copper-zinc solder in a sulfate bath for 7 minutes;

[0158] The silver-copper-zinc solder after galvanizing is electro-deposited zinc layer in the electro-deposited zinc solution, the thickness of the zinc layer is 0.44mm, and the mass fractions of silver, copper and zinc in the silver-copper-zinc solder are 10%, ...

Embodiment 2

[0165] A preparation method of solder, comprising the steps of:

[0166] (a) According to the mass percentage of Ag 21%, Cu 49%, and Zn 30%, the raw materials are added into the intermediate frequency smelting crucible, and a strip-shaped silver-copper-zinc solder with a diameter of 3mm is obtained through smelting, casting, extrusion, and drawing; Put the silver-copper-zinc solder into the ultrasonic cleaning equipment, add metal cleaning agent, and degrease and clean the surface of the solder;

[0167] (b) Electroplating Zn coating

[0168] Submerge the cleaned solder in step (a) in an acid solution at about 30°C for 5 minutes, then place the treated silver-copper-zinc solder in a sulfate bath for 7 minutes;

[0169] The silver-copper-zinc solder after galvanizing is electro-deposited zinc layer in the electrodeposited zinc solution, the zinc layer thickness of coating is 0.331mm, and the mass fraction of silver, copper, zinc in the silver-copper-zinc solder is 15%, 35% %,...

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Abstract

The invention relates to the technical field of brazing materials, in particular to brazing filler metal and a preparation method and application thereof. The brazing filler metal comprises a brazing filler metal core material, a zinc layer wrapping the surface of the brazing filler metal core material and a coating layer wrapping the surface of the zinc layer. The brazing filler metal core material is mainly prepared from, by mass, 14%-35% of silver, 34%-55% of copper and 30%-31% of zinc. The coating layer is mainly prepared from the following raw materials in parts by mass: 9-11 parts of boron, 9-11 parts of sodium borohydride, 38-42 parts of sodium fluoride, 33-42 parts of boric anhydride, 1-3 parts of a binder and 2-4 parts of a plasticizer. The brazing filler metal solves the problem that zinc is easy to volatilize during brazing, meanwhile, the silver content is low, and the brazing filler metal has good economic benefits and high brazing joint strength.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a brazing material and its preparation method and application. Background technique [0002] Silver solder has a moderate melting point, good wettability, good strength, ductility and corrosion resistance, and is widely used in low carbon steel, structural steel, stainless steel, refractory metals, copper and copper alloys, copper alloys and steel, hard Brazing of high-quality alloys and steel substrates. In the national standard GB / T 10046-2008, silver solders include 16 types of binary, ternary or quaternary solders, of which there are 11 types of silver-copper-zinc solders, which are widely used in the manufacturing industry. Due to the advantages of low melting temperature, excellent performance of brazed joints and easy processing, silver-copper-zinc-based solder has become the preferred solder to meet the relevant brazing process requirements in the fields of avi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/36B23K35/40
CPCB23K35/0222B23K35/302B23K35/40B23K35/3612
Inventor 王博王鑫华纠永涛孙华为李宇佳孙志鹏赵丹宋亚南
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD