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Preparation method of nano-granular zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes

A dispersion-strengthened copper and spot welding electrode technology, which is applied in the field of preparation of copper-based composite materials for welding electrodes, can solve the problems of easy agglomeration, expensive zirconium boride powder, low porosity, etc. The effect of removing the extraction process and improving mechanical properties

Active Publication Date: 2020-02-14
TAIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned technical problems in the prior art, the present invention provides a preparation method of nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes, which can improve its electrical conductivity while maintaining the excellent electrical conductivity of copper. At the same time, it effectively solves the problems of high price of nano-zirconium carbide and zirconium boride powder and its easy agglomeration in copper matrix. This method also has the advantages of simple equipment, simple operation, high production efficiency, ZrC and ZrB 2 Ceramics have the advantages of high degree of nanonization, uniform distribution, high product hardness and low porosity

Method used

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  • Preparation method of nano-granular zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes
  • Preparation method of nano-granular zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes
  • Preparation method of nano-granular zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes is as follows:

[0042] 1. Weighing: Cu powder with a particle size of ~0.5 μm, Zr powder with a particle size of ~45 μm, and B powder with a particle size of ~14 μm 4 C powder weighs the raw materials according to the molar ratio of 3.42:3:1, and the raw materials used are all commercial powders.

[0043] 2. Mixing: Mix the weighed Cu powder, Zr powder, B 4 C powder, as well as balls and milling jars are placed in a vacuum glove box, and after vacuuming to 5-10Pa, argon gas is flushed to normal pressure, and balls and powder are put into a ball milling jar in an inert gas environment, and then The sealed ball mill jar was put into a roller ball mill and mixed for 10 hours, wherein the balls were ZrO 2 Grinding balls, the weight ratio of the grinding balls to the powder is 10:1, and the rotating speed o...

Embodiment 2

[0054] A method for preparing a nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes is the same as in Example 1 except for the following.

[0055] In this example:

[0056] (1) The rotating speed of ball mill is 50 revolutions / minute;

[0057] (2) Oxygen-free copper block and Cu-containing nano-ZrC and ZrB 2 The composite powder is put into the vacuum melting furnace according to the weight ratio of 299:1;

[0058] (3) applying a magnetic stirring current of 30A;

[0059] (4) obtaining ZrC content is the nano-particle ZrC of 0.2wt.% and rod-shaped ZrB 2 Dispersion strengthened copper matrix composites. The tensile strength of the composite material is 388 MPa, and the conductivity is 90% IACS.

Embodiment 3

[0061] A method for preparing a nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes is the same as in Example 1 except for the following.

[0062] In this example:

[0063](1) The oxygen-free copper block and the Cu-containing nano-ZrC powder are placed in a vacuum melting furnace at a weight ratio of 59:1;

[0064] (2) The magnetic stirring time is 10min, and the magnetic stirring current is 30A;

[0065] (3) Obtaining ZrC content is 1.0wt.% nano-particle ZrC and rod-shaped ZrB 2 Dispersion strengthened copper matrix composites. The composite has a tensile strength of 494 MPa and an electrical conductivity of 83% IACS.

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Abstract

The invention belongs to the field of preparation of copper-based composite materials for welding electrodes, and discloses a preparation method of nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite materials for spot welding electrodes: uniformly mixed Cu-Zr-B 4 C powder is cold-pressed, and then the powder compact is placed in a self-propagating high-temperature synthesis equipment and ignited to obtain Cu-containing nanoparticle ZrC and rod-shaped ZrB. 2 Composite powder, then melt the mixture of oxygen-free copper and Cu-containing nano-particle zirconium carbide-rod-shaped zirconium boride composite powder in a vacuum melting furnace, and apply magnetic stirring to prepare nano-particle ZrC and rod-shaped ZrB 2 Dispersion strengthened copper matrix composites. The method of the invention has the advantages of low cost, simple process, high production efficiency, ZrC-ZrB 2 The powder has the characteristics of high degree of nanometerization and uniform distribution.

Description

technical field [0001] The invention belongs to the field of preparation of copper-based composite materials for welding electrodes, and is mainly used for welding machine electrode heads, electrode caps, etc., and specifically relates to a nano-particle zirconium carbide-rod-shaped zirconium boride dispersion-strengthened copper-based composite material for spot welding electrodes. Preparation. Background technique [0002] Spot welding is widely used in industries such as automobile, instrumentation and aviation manufacturing. Because it is often subjected to high temperature and high pressure during service, copper alloy electrodes are prone to failure, which reduces production efficiency and affects the quality of solder joints. With the widespread use of automatic welding and welding robots in modern production, there is an urgent need to develop electrode materials with both excellent electrical conductivity and mechanical properties. One of the effective ways to solv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02C22C9/00
CPCC22C1/1015C22C1/1036C22C9/00C22C1/1047
Inventor 张梦贤霍颜秋赵先锐王天乐方一航姚海龙王洪涛陈清宇白小波
Owner TAIZHOU UNIV