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Copper-based electrical contact composite material and process for preparing same

A technology of composite materials and electrical contacts, applied in the direction of contact materials, etc., can solve the problems of cadmium component toxicity, deterioration of conductivity of contact elements, etc., and achieve improved electrical performance, good arc extinguishing performance, and strong anti-welding performance Effect

Inactive Publication Date: 2005-09-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small switching force of the low-voltage switch, the oxide film formed on the surface of the electrical contact is not easy to be destroyed, and due to its existence, the conductivity of the contact element is deteriorated
In addition, metal cadmium is mainly added to the current silver contacts as a low melting point component to improve performance such as welding resistance, but cadmium components are very toxic and should be avoided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition weight ratio of the material in this embodiment is: 2% tin, 2% boron carbide, 0.3% lanthanum-rich mixed rare earth, and the balance is copper.

[0021] According to the above ratio, first, make lanthanum-rich mixed rare earth and copper into 10% mixed rare earth-copper powder (weight ratio, the same below) with a particle size of less than or equal to 200 mesh, and then add tin powder and copper powder with a particle size of less than or equal to 200 mesh for mixing Ball milling, the ball milling time is 5 hours, the material balls used in the ball milling are 6mm and 8mm agate balls, the ball-to-material ratio is 15:1; then add 2% boron carbide for mechanical powder mixing; after mixing evenly, use a hydraulic press to form, press The pressure is 600MPa, and the holding time is 5 minutes; put the pressed blank into the sintering furnace for sintering, the sintering temperature is 900°C, the holding time is 3 hours, and NH is introduced during the sinter...

Embodiment 2

[0024] The composition weight ratio of the material in this embodiment is: 2% tin, 4% boron carbide, 0.6% lanthanum-rich mixed rare earth, and the balance is copper. Ball milling, powder mixing, pressing, and sintering were carried out according to the same preparation process steps and parameters as the composition ratio and the embodiment, and the pressing pressure was 700 MPa, and the secondary pressing pressure was 600 MPa. Through the above process, a copper-based electrical contact composite material blank is made.

[0025] The performance of the prepared blank reaches: density 8.3g / cm 3 ; Resistivity 3.82μΩ.cm; Hardness HV (MPa) 720; Oxidation weight gain 0.07mg / g.day under atmospheric conditions of 150°C.

Embodiment 3

[0027] The composition weight ratio of the material in this embodiment is: 4% tin, 0.5% boron carbide, 1.6% cerium-rich mixed rare earth, and the balance is copper.

[0028] According to the composition ratio and preparation process steps of this composition, firstly, cerium-rich mixed rare earth and copper are made into 10% mixed rare earth-copper powder with a particle size of 300 mesh, and then tin powder and copper powder with a particle size of 300 mesh are added for mixed ball milling for 6 hours , The material balls used in the ball mill are agate balls of 6mm and 8mm, and the ball-to-material ratio is 15:1. Then add 0.5% boron carbide for mechanical powder mixing; after mixing evenly, use a hydraulic press to press into shape, the pressing pressure is 850MPa, and the holding time is 3 minutes; put the pressed blank into a sintering furnace for sintering, the sintering temperature is 850 ° C, and keep warm The time is 4 hours, and NH is introduced during the sintering p...

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Abstract

This invention relates to a copper-base contact compound material used in low and medium voltage electric appliance switches and its preparation method. The material is composed of materials in the following weight percentage: Sn 0.1-0.5%, B carbide 0.1-5%, the mixed rare earth of fat La or fat Ce 0.05-2%, the rest is Cu. The material is prepared by mixing, cold- pressing powders, cold-pressing again and sintering to finish the product.

Description

1. Technical field [0001] The invention belongs to a copper-based electric contact composite material and a preparation method thereof, in particular to a copper-based electric contact composite material used for medium and low-voltage electrical switches and a preparation method thereof. 2. Background technology [0002] The weak current contact element is a key part of the instrument, which plays an important role in the life and reliability of the instrument. In order to ensure the reliability of the weak current contact, 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. According to the physical and chemical properties of silver and copper, the electrical and thermal conductivity of copper is the closest to that of silver. Therefore, as a conductive material, the most suitable element to replace silver is cop...

Claims

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Application Information

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IPC IPC(8): H01H1/04
Inventor 耿浩然郭忠全钱宝光
Owner UNIV OF JINAN
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