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Nitride enhanced copper-based electrical contact composite material

A technology of composite materials and nitrides, which is applied to contacts, circuits, electric switches, etc., can solve problems such as rising contact resistance, high resistance of oxidation products, and shortened life of contact materials, achieving stable contact resistance and anti-welding performance And the effect of good oxidation resistance, excellent electrical properties and mechanical properties

Inactive Publication Date: 2015-12-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal copper is easy to oxidize compared to silver, and the oxidation product has a large resistance. If pure copper is used as an electrical contact material, the contact resistance will rise suddenly, especially in the process of breaking and closing the electrical contactor, electrofusion welding and arc erosion The phenomenon is serious, and the life of the contact material is greatly shortened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The composition weight ratio of the material in this embodiment is: 2% bismuth, 0.5% titanium nitride, 0.2% rare earth yttrium, 1% yttrium oxide, and the balance is copper.

[0015] First, according to the composition ratio, the rare earth yttrium and copper are made into copper-yttrium alloy powder with a yttrium content of 0.05% and a particle size of 100-300 mesh, and then adding bismuth powder with a particle size of 200 mesh for ball milling. The ball milling time is 2 hours. The balls used in the ball mill are corundum balls, the ball-to-material ratio is 15:1; then 0.5% titanium nitride and 1% yttrium oxide are added for mechanical powder mixing; after mixing evenly, they are sintered in a vacuum hot-press furnace, and the pressure is pressed The sintering temperature is 20MPa, the sintering temperature is 800°C, the pressure is applied when the predetermined temperature is reached, the holding time is 2 hours, and then the pressure is released when the temperatur...

Embodiment 2

[0018] The composition weight ratio of the material in this embodiment is: 2% bismuth, 1.5% titanium nitride, 0.2% rare earth yttrium, 1% yttrium oxide, and the balance is copper.

[0019] Ball milling, powder mixing, and vacuum hot-press sintering were carried out according to the same preparation process steps and parameters as in Example 1. Through the above process, a copper-based electrical contact composite material or part is made.

[0020] Basic properties of this material: Density 99.46%; Resistivity 2.97μΩ·cm; Hardness 57HB; Oxidation weight gain of 1.08mg / cm2 in 400℃ atmospheric environment for 20h 2 .

Embodiment 3

[0022] The composition weight ratio of the material in this embodiment is: 4% bismuth, 1.5% titanium nitride, 0.2% rare earth yttrium, 1% yttrium oxide, and the balance is copper.

[0023] Ball milling, powder mixing, and vacuum hot-press sintering were carried out according to the same preparation process steps and parameters as in Example 1. Through the above process, a copper-based electrical contact composite material or part is made.

[0024] Basic properties of this material: Density 98.76%; Resistivity 3.75μΩ·cm; Hardness 60HB; Oxidation weight gain of 2.25mg / cm2 in 400℃ atmospheric environment for 20h 2 .

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Abstract

The invention relates to a nitride enhanced copper-based electrical contact composite material, which comprises the following components in percentage by weight: 0.5 to 4 percent by nitride, 0.5 to 4 percent of bismuth, 0.1 to 0.6 percent of rare earth yttrium, 0.5 to 2.5 percent of yttrium oxide, and the rest is copper and other unavoidable impurities, wherein the nitride is titanium nitride or aluminum nitride. The material provided by the invention is made by a preparation method comprising the steps of preparing powder by atomization, proportioning, mixing and vacuum hot pressed sintering. The composite material takes copper as a base body, the main raw materials are rich in resources, the nitride is distributed in the copper base material uniformly and dispersedly in an enhanced phase mode, and the fineness degree of an internal organizational structure of the material is improved. The composite material not only has good electrical conductivity, thermal conductivity, welding resistance and arc ablation resistance, but also is excellent in mechanical property and abrasion resistance, can meet basic requirements of workpieces such as an electrical contact and the like for materials, and can be applied to low-voltage electrical apparatuses such as medium and low electrical-load power switches, relays, DC contactors, air switches and the like. Compared with a silver-based electrical contact material, the nitride enhanced copper-based electrical contact composite material is more advantageous in price-to-performance ratio.

Description

technical field [0001] The invention relates to a nitride-reinforced copper-based electrical contact composite material, in particular to a method for preparing a copper-based electrical contact material by adding an appropriate amount of nitrides, which can be applied to power switches, relays, DC contactors, and converters with medium and low electrical loads. In low-voltage electrical appliances such as appliances. Background technique [0002] Weak current contact elements are the key components of instruments and meters, which play an important role in the life and reliability of instruments and meters. In order to ensure the reliability of weak current contacts, precious metal silver and its alloy materials are widely used at home and abroad. In recent years, in order to reduce the loss of silver metal, people are constantly seeking new ways of saving and replacing silver. The electrical and thermal conductivity of copper is the closest to that of silver, so copper is...

Claims

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Application Information

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IPC IPC(8): H01H1/025
CPCH01H1/025
Inventor 耿浩然肖振刘焕超刘星佐冷金凤李捷
Owner UNIV OF JINAN
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