Aluminum powder-containing flux-cored silver brazing filler metal for brazing hard alloy and preparation method

A technology of hard alloy and silver solder, which is applied in the direction of welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of affecting production and manufacturing efficiency, short service life, non-wear-resistant brazing seam, etc., and achieve improvement Wetting and spreading properties, suppression of high temperature turbulent flow, and effect of lowering brazing temperature

Active Publication Date: 2021-04-09
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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  • Aluminum powder-containing flux-cored silver brazing filler metal for brazing hard alloy and preparation method
  • Aluminum powder-containing flux-cored silver brazing filler metal for brazing hard alloy and preparation method
  • Aluminum powder-containing flux-cored silver brazing filler metal for brazing hard alloy and preparation method

Examples

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Effect test

Embodiment 1

[0031]This example discloses a brazing metal-containing powder silver solder and preparation method for brazing hard alloy, including 20% ​​of the flux dielectric core and 80% silver-containing metal layer that accounted for the total mass of the silver brazing material. The aluminum powder is filled in the metal wrapped inside, and the mass ratio of the flux powder in the present embodiment is shown in Table 1. The particle size of the aluminum powder is 240 nm to 400 nm, and there is no agglomeration before the mixing;

[0032]The silver-containing metal layer is wrapped as a pharmaceutical core solder, which includes the following substances: AG18.0%, Cu46.0%, Sn 2.1%, and the margin is Zn.

[0033]Table 1 Examples 1 to 3 made of flux dielectric core components and dosage

[0034]

[0035]In this example, the production method of the drug core silver brazing material includes the following steps:

[0036]The silver metal layer raw material is melted and secondary refinery according to the conve...

Embodiment 2

[0043]This example is shown in Table 1 as described in the main differences of the first embodiment.

Embodiment 3

[0045]This example is shown in Table 1 as described in the main differences of the first embodiment.

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Abstract

The invention discloses aluminum powder-containing flux-cored silver brazing filler metal for brazing a hard alloy. The aluminum powder-containing flux-cored silver brazing filler metal comprises a brazing flux core, and a silver-containing metal layer wrapping the brazing flux core; the brazing flux core contains aluminum powder, and the particle size of the aluminum powder ranges from 200 nm to 500 nm; and preferably, the brazing flux core comprises, by mass, 0.5%-4.3% of aluminum powder, 13.0%-36.0% of fluoride, 15.0%-26.0% of boride, and 44.7%-60.5% of fluoroborate salt. The invention further discloses a preparation method for the aluminum powder-containing flux-cored silver brazing filler metal. The aluminum powder in the flux core instantly releases heat to promote brazing when the aluminum powder and metal oxide are subjected to an aluminothermic reaction in the brazing process, and the aluminum powder generates dispersed-phase aluminum oxide, so that the hardness and abrasion resistance of brazing seams are effectively enhanced.

Description

Technical field[0001]The present invention relates to the field of solder materials, and more particularly to a brazing hydratric silver solder and preparation method for brazing hard alloy.Background technique[0002]The cemented carbide has a high hardness, wear resistance, thermal hardness and corrosion resistance, mainly used in metal cutting tools, such as mine mining, coal cutting, oil drilling, construction engineering drills. Since the price of carbide is relatively expensive, the plasticity and impact toughness are relatively poor, and the application form of most of the hard alloy is used in the use of small pieces of hard alloy and high strength steel, such as structural steel, tool steel, etc., and heterogeneous connections Reduce manufacturing costs. Common carbide (cut part) and steel (matrix) connection method there is: brazing method, mechanical clamping method, stress inlaid and bonding method, wherein the brazing method is the most extensive connection of both. One o...

Claims

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Application Information

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Patent Type & Authority Applications(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
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