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Weak electricity copper base electric contact composite material and method for making same

A technology of composite materials and electric contacts, which is applied in the directions of contacts, circuits, electric switches, etc., can solve the problems that wear resistance and conductivity need to be improved, and affect the performance of electric contacts, etc., and achieve arc extinguishing performance and oxidation resistance Good performance, strong anti-welding performance, excellent wear resistance

Inactive Publication Date: 2008-01-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above materials have good electrical conductivity, welding resistance and oxidation resistance, their wear resistance and electrical conductivity need to be improved, which affects the performance of electrical contacts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition ratio of the material in the embodiment of the present invention is: 95.92% copper, 2% bismuth, 2% TiAl intermetallic compound, 0.08% lanthanum-rich mixed rare earth.

[0021] According to the composition ratio and preparation process steps, the copper powder, bismuth powder, intermetallic compound and lanthanum-rich mixed rare earth powder whose particle size is less than or equal to 200 mesh and whose weight ratio meets the above ratio are mixed by high-energy ball milling. The equipment adopts high-energy planetary type Ball mill, the ball milling time is 1.5 hours, and the ball-to-material ratio is 15:1. After mixing evenly, use a hydraulic press to press into shape, the pressing pressure is 700MPa, and the holding time is 5 minutes. Put the sample into a high-temperature resistance furnace for sintering. The sintering temperature is 900°C, and the holding time is 3 hours. During the sintering process, argon gas is used for gas protection. After sin...

Embodiment 2

[0025] The composition ratio of the material in the embodiment of the present invention is: 94.4% copper, 4% bismuth, 1% TiAl intermetallic compound, 0.6% lanthanum-rich mixed rare earth.

[0026] Prepared using the following steps:

[0027] (1) Grind copper, bismuth, lanthanum-rich mixed rare earth, and TiAl intermetallic compound into fine powder with a particle size of 200-400 mesh, and then perform ball milling to mix the powder. The ball milling time is 5 hours, and the material balls used for ball milling are 6mm and 8mm bearings Steel balls, the ratio of ball to material is 15:1;

[0028] (2) cold-press molding the uniformly mixed powder, the pressure is 850MPa, and the holding time is 5 minutes;

[0029] (3) Sintering the cold-pressed part under the protection of argon gas, the sintering temperature is 850°C, and the holding time is 5 hours;

[0030] (4) Carry out secondary compression to the test piece, the pressure is 1000MPa, and the holding time is 7 minutes;

...

Embodiment 3

[0034] The composition ratio of the material in the embodiment of the present invention is: 94.8% copper, 1% bismuth, 4% TiAl intermetallic compound, 0.2% cerium-rich mixed rare earth.

[0035] Prepared using the following steps:

[0036] (1) Grind copper, bismuth, cerium-rich mixed rare earths, and TiAl intermetallic compounds into fine powders with a particle size of 200-400 mesh, and then perform ball milling to mix the powder. The ball milling time is 4 hours. The equipment is a high-energy planetary ball mill, which is used for ball milling. The material balls are 6mm and 8mm bearing steel balls, and the ball-to-material ratio is 15:1;

[0037] (2) cold press molding the mixed powder, the pressure is 600MPa, and the holding time is 10 minutes;

[0038] (3) Sintering the cold-pressed part under the protection of argon gas, the sintering temperature is 900°C, and the holding time is 3 hours;

[0039] (4) Carry out secondary compression to the test piece, the pressure is 8...

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Abstract

The invention relates to a copper base electrical contact compound material, in particular to a weak current copper base electrical contact compound material used for low voltage electric switch, and a method to prepare the compound material. The compound material is composed of materials by the following proportions: 0.5-4 percent bismuth, 0.5-4 percent TiAl metal compound, 0.05-0.6 percent rare earth material, and the rest copper and other unavoidable impurities. The preparation method is: mixing powder in ball mill; cold pressing; sintering; secondary molding; and secondary sintering; the compound material produced with the invention has the advantages of strong anti-fusion welding performance, and good arc extinguishing performance and oxidation resistant performance. The electricity conductivity is similar to that of silver base electrical contact compound material, and wearing-resistant performance superior to that of the original boron carbide copper base and silver base electrical contact compound material. Therefore, the compound material is a cheap replacement for silver alloy electrical contact in low voltage switches.

Description

1. Technical field [0001] The invention relates to a copper-based electrical contact composite material, in particular to a weak-current copper-based electrical contact composite material used for low-voltage electrical switches, and a preparation method for the composite material. 2. Background technology [0002] The weak current contact material is a key part of the instrument and plays an important role in the life and reliability of the instrument. In order to ensure the working reliability of weak current contacts, precious metal silver and its alloy materials are generally used at home and abroad. In recent years, in order to reduce the loss of silver metal, people are constantly seeking new technical ways to save 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, copper is the most suitable metal to replace silver. Ho...

Claims

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Application Information

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IPC IPC(8): H01H1/025C22C9/00C22C1/04C22C1/05H01H11/04
Inventor 耿浩然郭忠全刘玲
Owner UNIV OF JINAN
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