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A kind of aluminum powder flux-cored silver solder for brazing hard alloy and preparation method

A technology of hard alloy and silver brazing filler metal, applied in welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of non-wearability of brazing seam, harm to human health, short service life, etc.

Active Publication Date: 2022-07-08
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

Most silver solders currently suitable for brazing hard alloy tools have higher Ag content (mass fraction 27% to 85%), and silver solders for cemented carbide brazing with lower Ag content (mass fraction ≤ 20%) are added with Cadmium (Cd) element has considerable toxicity and great harm to human health, and its use is greatly restricted
In addition, the above-mentioned low-Ag and high-Ag brazing filler metals obtained by brazing hard alloys all have technical problems of low hardness and non-wear-resistant brazing seams, resulting in a short service life of hard alloy tools such as complete sets of shield cutting tools in the field of excavation. , requiring frequent tool changes or repair welding, seriously affecting manufacturing efficiency

Method used

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  • A kind of aluminum powder flux-cored silver solder for brazing hard alloy and preparation method
  • A kind of aluminum powder flux-cored silver solder for brazing hard alloy and preparation method
  • A kind of aluminum powder flux-cored silver solder for brazing hard alloy and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment discloses an aluminum powder-containing flux-cored silver brazing material for brazing hard alloys and a preparation method, including a flux core and 80% silver-containing metal layer, which account for 20% of the total mass of the flux-cored silver brazing material. The aluminum powder is filled inside the metal coating layer as a flux. In this embodiment, the mass ratio of each component of the flux powder is shown in Table 1. The particle size of aluminum powder is 240nm to 400nm, and there is no agglomeration before mixing;

[0032] The silver-containing metal layer is used as the coating layer of the flux-cored brazing material, and it includes the following substances according to the mass fraction: Ag 18.0%, Cu 46.0%, Sn 2.1%, and the balance is Zn.

[0033] Table 1 Components and dosage of flux cores prepared in Examples 1 to 3

[0034]

[0035] The preparation method of the flux-cored silver solder in the present embodiment comprises the fo...

Embodiment 2

[0043] The main differences between this embodiment and Embodiment 1 are shown in Table 1.

Embodiment 3

[0045] The main differences between this embodiment and Embodiment 1 are shown in Table 1.

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Abstract

The invention discloses an aluminum powder-containing flux-cored silver brazing material for brazing hard alloys, which comprises a flux flux core and a silver-containing metal layer covering the flux flux core; The particle size is 200nm to 500nm; further preferably, the flux core includes, according to the mass fraction: 0.5% to 4.3% aluminum powder; 13.0% to 36.0% fluoride; 15.0% to 26.0% boride; 44.7% to 60.5% Fluoroborate; the invention also discloses a preparation method of the aluminum powder-containing flux-cored silver brazing filler metal; the aluminum powder in the flux core of the invention produces an aluminothermic reaction with the metal oxide in the brazing process to exotherm instantly to promote brazing, and the aluminum powder promotes brazing. Alumina of disperse phase is formed, which effectively enhances the hardness and wear resistance of the brazing joint.

Description

technical field [0001] The invention relates to the technical field of brazing filler metals, in particular to a flux-cored silver brazing filler metal containing aluminum powder for brazing hard alloys and a preparation method. Background technique [0002] Cemented carbide has high hardness, wear resistance, hot hardness and corrosion resistance, and is mainly used in metal cutting tools, such as mining, coal mining picks, oil drilling, construction tools and other fields. Since cemented carbide is relatively expensive and has relatively poor plasticity and impact toughness, most of the application forms of cemented carbide are small pieces of cemented carbide and high-strength steel, such as structural steel, tool steel, etc. Reduce manufacturing costs. Commonly used methods for connecting cemented carbide (cutting part) and steel (substrate) are: brazing method, mechanical clamping method, stress insert method and bonding method, among which brazing method is the most w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/30B23K35/40
CPCB23K35/282B23K35/302B23K35/40
Inventor 王博张雷矫全宇王朋旭何茜费文潘纠永涛樊志斌程战
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD