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Cadmium-free low-silver medium-temperature brazing filler metal for welding cemented carbide and steel and preparation method thereof

A technology of hard alloy and brazing material, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problem of containing toxic elements such as cadmium, achieve excellent strength and toughness, facilitate processing and assembly, and spreadability and good caulking effect

Inactive Publication Date: 2015-11-18
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cadmium-free low-silver medium-temperature solder for welding hard alloy and steel, which solves the problem that the currently-used medium-temperature solder in the prior art often contains the toxic element cadmium

Method used

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  • Cadmium-free low-silver medium-temperature brazing filler metal for welding cemented carbide and steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of the cadmium-free low-silver medium-temperature brazing filler metal of the present invention first uses the ultra-high vacuum electric arc furnace to melt the master alloy, and then uses a single-roller rapid cooling and rapid solidification device to prepare the brazing filler metal foil, which is specifically implemented according to the following steps:

[0019] Step A, melting and matching solder master alloy

[0020] A1. Weigh each high-purity metal according to the following atomic percentage: the total percentage is 100%, of which Ag is 40%-45%, Sn is 7%-10%, Zn is 5%-9%, and Ni is 0.2- 0.5%, Ce 0.02%~0.04%, Ga 0.01%~0.03%, Bi 0.01%~0.03%, Cu 42%~48%; the purity of each high-purity metal is 99.99%; The weighed high-purity metals are purified;

[0021] A2. The high-purity metals purified in step A1 are heated and melted in an ultra-high vacuum electric arc furnace, turned over several times and heated in a cycle, so that the alloy is ful...

Embodiment 1

[0026] A cadmium-free low-silver medium-temperature alloy solder foil with a thickness of about 60 μm and a width of about 8 mm was obtained. The alloy solder foil is used to weld 40Cr and YG6, and the tensile and shear strength of the joint is 172MPa.

Embodiment 2

[0028] A cadmium-free low-silver medium-temperature alloy brazing material foil with a thickness of about 50 μm and a width of about 8 mm was obtained. 40Cr and YG6 are welded with this alloy solder foil, and the tensile shear strength of the joint is 186MPa, which is equivalent to the shear strength of the joint of 40Cr and YG6 brazed by the widely used Ag-Cu-Cd medium temperature solder.

[0029] Example 6

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Abstract

The invention discloses a cadmium-free low-silver medium-temperature solder for welding hard alloy and steel. The cadmium-free low-silver medium-temperature solder consists of the following components by atomic percent: 40 to 45 percent of Ag, 7 to 10 percent of Sn, 5 to 9 percent of Zn, 0.2 to 0.5 percent of Ni, 0.02 to 0.04 percent of Ce, 0.01 to 0.03 percent of Ga, 0.01 to 0.03 percent of Bi and 42 to 48 percent of Cu. The invention also discloses a preparation method of cadmium-free low-silver medium-temperature solder. The cadmium-free low-silver medium-temperature solder is good in flexibility and convenient to process and assemble; and the cadmium-free low-silver medium-temperature solder is well matched with the hard alloy and alloy steel when in welding, the comprehensive performance of a connector is high, the preparation method is simple, the production cost is low, and convenience in popularization can be realized.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to a cadmium-free low-silver medium-temperature solder used for welding cemented carbide and steel, and also relates to a preparation method of the cadmium-free low-silver medium-temperature solder. Background technique [0002] YG series cemented carbide has high hardness, high wear resistance, heat resistance, corrosion resistance and good red hardness, and is widely used in geological exploration, mining, oil drilling and other industrial fields, welding of cemented carbide and steel The performance of the joint often becomes the main obstacle restricting the full play of the excellent performance of the cemented carbide. [0003] The usual cemented carbide drilling tools and cutting tools are mostly used by brazing to inlay cemented carbide on medium-carbon steel or low-alloy steel substrate. Due to the high brazing temperature, the cemented carbide is over-burned and af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/30B23K35/3006B23K35/302
Inventor 翟秋亚陈凯徐锦锋
Owner XIAN UNIV OF TECH