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Preparation of tungsten copper electric contact material with high electric-abrasion resistance

A technology of electric contact material and arc ablation, which is applied in the direction of cable/conductor manufacturing, contacts, circuits, etc., can solve the problems of low quality of electric contacts, corrosion pits on the surface of contacts, and short maintenance period, so as to improve the resistance Arc ablation performance, extended service life, simple process effect

Inactive Publication Date: 2008-10-08
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's power system has large losses in the process of power transmission and transformation, low power utilization rate, short maintenance cycle, frequent accidents, etc. These problems are largely caused by the low quality of electrical contacts. With the modernization With the rapid development of construction, the load of high-voltage transmission and transformation lines is increasing day by day, and switching appliances are developing towards higher voltage and larger capacity.
The traditional high-voltage tungsten-copper electrical contact material, under the action of high voltage and high current, arc ablation will cause serious pitting on the surface of the contact and cause premature failure, which can no longer meet the demand

Method used

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Examples

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preparation example Construction

[0016] The preparation method of the present invention is carried out according to the following steps,

[0017] Step 1, weighing, take 2.4%-17.6% copper powder and 82.4%-97.6% tungsten powder by weight percentage, the particle size of copper powder is 200-250 mesh, the particle size of tungsten powder is 6-8μm, copper The total weight of copper powder and tungsten powder is 100%. In addition, according to the total weight of the above copper powder and tungsten powder, we weigh 1% to 4% of rare earth elemental lanthanum or cerium, 0.05% to 0.15% of nickel powder and 0.5% to 1.5% Ethanol in milliliters by weight, the ethanol concentration is 55% to 65%

[0018] Step 2, mechanical alloying, the copper powder and tungsten powder weighed in step 1 are each taken from 20 to 40% of their own weight, and put into a high-energy ball mill together with all the rare earth elements weighed in step 1 for mechanical alloying, ball milling The rotating speed is 200-400 rpm, the ball-milli...

Embodiment 1

[0023] Tungsten-copper alloy W70Cu30La electrical contact materials with a diameter of 20 mm, a length of 60 mm, a rare earth lanthanum addition of 2%, and a weight percentage of 70 and 30 were prepared.

[0024] Step 1, weigh copper powder with a particle size of 200 mesh and tungsten powder with a particle size of 6 μm according to the following weight, the total weight of copper powder and tungsten powder is 280 grams, and then weigh according to 2% of the total weight of copper and tungsten powder The amount of lanthanum is 5.6 grams.

[0025] Copper powder (17.6%) 49.28 grams Tungsten powder (82.4%) 230.72 grams

[0026] Step 2, the copper powder and tungsten powder weighed in step 1 are each taken 20% of their own weight, and put into a high-energy ball mill together with 5.6 grams of lanthanum weighed in step 1 for mechanical alloying. The speed of the high-energy ball mill is 400 rpm / minute, the ball-milling ratio is 40: 1, and the ball-milling time is 4 hours, and ...

Embodiment 2

[0037] Tungsten-copper alloy W80Cu20Ce electrical contact materials with a diameter of 30 mm, a length of 80 mm, a rare earth cerium addition of 1%, and a weight percentage of 80 and 20 were prepared.

[0038] In step 1, the copper powder with a particle size of 250 mesh and the tungsten powder with a particle size of 8 μm are weighed according to the following weights. The total weight is 803 grams, and then 8.03 grams of cerium is weighed according to 1% of the total weight of the copper powder and the tungsten powder.

[0039] Copper powder (5.8%) 46.574 grams Tungsten powder (94.2%) 756.426 grams

[0040] Step 2, take the copper powder weighed in step 1 to take 35% of its own weight, which is 16.301 grams, and the tungsten powder to take 25% of its own weight, which is 189.107 grams, and put them into a high-energy ball mill together with 8.03 grams of cerium weighed in step 1. For mechanical alloying, the rotating speed of the high-energy ball mill was 300 rpm, the ball-...

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Abstract

The invention discloses a preparation method of tungsten-copper electrical contact material with high arc ablation resistance, the method is carried out according to the following steps: copper powder, tungsten powder and rare earth simple substance lanthanum or cerium are firstly weighted according to the proportion; the mechanical alloying is then carried out in a high-energy ball mill; nickel powder and ethanol are further added to carry out the common mechanical mixing; the press forming is carried out in a mold; a green compact is finally arranged in a sintering furnace with high-temperature protective atmosphere for adopting the infiltration technology for sintering and molding, thus obtaining the tungsten-copper electrical contact with high arc ablation resistance. The method of the invention can effectively solve the problem of premature failure caused by serious ablation of the surface of the contact due to the arc ablation, improve the performance and prolong the service life of the tungsten-copper electrical contact material.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a preparation method of a tungsten-based electric contact material for instruments and electrical equipment, in particular to a preparation method of a tungsten-copper electric contact material with high resistance to arc ablation. Background technique [0002] Tungsten copper electrical contact material is a pseudo-alloy composed of tungsten with high melting point and high hardness and copper with high electrical conductivity and high thermal conductivity. At present, my country's power system has large losses in the process of power transmission and transformation, low power utilization rate, short maintenance cycle, frequent accidents, etc. These problems are largely caused by the low quality of electrical contacts. With the modernization With the rapid development of construction, the load of high-voltage transmission and transformation lines is increasing day by d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00H01B1/02H01B13/00H01H1/021
Inventor 陈文革陈勉之
Owner XIAN UNIV OF TECH
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