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Arc ablation resistance copper-based electrical contact composite material

A technology of electrical contact materials and composite materials, applied in contacts, circuits, electric switches, etc., can solve problems such as resistance of easily oxidized oxidation products, shortened life of contact materials, increase in contact resistance, etc., and achieve excellent arc ablation resistance , Anti-welding performance is good, the effect of stable contact resistance

Inactive Publication Date: 2015-01-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal copper has its own defects, it is easy to oxidize and the resistance of the oxidation product is very high. As an electrical contact material, the contact resistance will rise suddenly, especially in the process of breaking and closing the electrical contactor, the arc ablation 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

[0013] The composition weight ratio of the material of the embodiment of the present invention is: 2% zinc, 1.5% yttrium oxide, 0.1% cerium-rich mixed rare earth, 1% boron carbide powder, and the rest is conductive copper powder.

[0014] Prepare using the following steps:

[0015] (1) Mix -200 mesh zinc powder, -325 mesh rare earth-copper powder, -325 boron carbide and -200 mesh copper powder according to the ratio, and mix the powder with a V-type powder mixer, and the mixing time is 1 hour;

[0016] (2) Put the uniformly mixed powder into the mold, press and shape it at room temperature, the pressing pressure is 400MPa, and the pressure holding time is 3min;

[0017] (3) The press-formed part is pre-fired under the protection of argon gas, the pre-fire temperature is 450 ℃, the pre-fire time is 60 min, the sintering temperature is 850 ℃, and the holding time is 30 min.

[0018] Through the above process, a copper-based electrical contact composite material is made.

[0019] The basic ...

Embodiment 2

[0021] The composition weight ratio of the material of the embodiment of the present invention is: 2% zinc, 0.5% yttrium oxide, 0.1% cerium-rich mixed rare earth, 1% boron carbide powder, and the rest is copper powder.

[0022] This group uses the same process steps and parameters as in Example 1.

[0023] The basic properties of this material: ①Density: 8.15 (g / cm3); ②Resistivity: 3.23 (μΩ·cm) ③Hardness: 38 (HB).

Embodiment 3

[0025] The composition ratio of the material of the embodiment of the present invention is 4% zinc, 1.5% yttrium oxide, 0.1% cerium-rich mixed rare earth, 1% boron carbide powder, and the rest is copper powder.

[0026] Prepare using the following steps:

[0027] (1) Same as step 1 in Example 1;

[0028] (2) Put the uniformly mixed powder into the mold, press and shape it at room temperature, the pressing pressure is 450MPa, and the pressure holding time is 3min;

[0029] (3) Pre-fire the press-formed part under the protection of argon gas, the pre-fire temperature is 450℃, the pre-fire time is 60min, the sintering temperature is 800℃, and the holding time is 10min.

[0030] The basic properties of this material: ①Density: 8.34 (g / cm3); ②Resistivity: 3.75 (μΩ·cm) ③Hardness: 42 (HB).

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Abstract

The invention relates to an arc ablation resistance copper-based electrical contact composite material, in particular to a method for preparing an arc ablation resistance copper-based electrical contact composite material through adding an appropriate amount of yttrium oxide. The arc ablation resistance copper-based electrical contact composite material is mainly used for a medium-low-load power switch, a relay, a contactor, a starter and other electrical devices. The copper-based electrical contact composite material used for the low-voltage electrical devices comprises, by weight, 0.5-6% of zinc, 0.5-2.5% of yttrium oxide, 0.04-1% of cerium-rich mischmetal, 0.5-5% of boron carbide and the balance being copper powder and other inevitable impurities. The arc ablation resistance copper-based electrical contact composite material is prepared through batching, powder mixing, compression forming, pre-sintering and argon shield sintering. Electric conduction performance, heat conduction performance, welding resistance, arc ablation resistance and friction resistance of the novel copper-based composite material are comparable with a silver-based composite material, basic requirements for materials of electrical contacts and other workpieces can be met, and the prominent arc ablation resistance is achieved.

Description

Technical field [0001] The invention relates to an arc ablation-resistant copper-based electrical contact composite material, in particular to a method for preparing an arc-ablation-resistant copper-based electrical contact material by adding an appropriate amount of yttrium oxide, and is mainly used for power switches, relays, and contacts of medium and low loads In electrical installations such as starters and starters. Background technique [0002] Current is transmitted from one conductor to another conductor through the contact between the conductor and the conductor. The physical and chemical phenomenon of current transmission is realized between the two or several conductors through the mechanical contact surface. This state is called electrical contact. The conductor becomes the electrical contact material (electric contact material). Studies have shown that the arc burning phenomenon generated during the opening and closing of electrical contacts is extremely complex. U...

Claims

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Application Information

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IPC IPC(8): H01H1/025H01H11/04B22F3/12B22F1/00
CPCB22F2998/10C22C1/05C22C9/04H01H1/025B22F3/02B22F3/1007
Inventor 耿浩然牟振赵德刚王庆磊左敏
Owner UNIV OF JINAN