A kind of preparation method of copper tungsten contact material

A contact material, copper tungsten technology, applied in the manufacture of emergency protection devices, electrical components, circuits, etc., can solve the problems of reduced probability of tungsten particles capturing nickel, discounted tungsten skeleton activation and sintering effect, and insufficient dispersion of tungsten particles. , to achieve excellent arc erosion resistance, improve the activation sintering effect, and improve the service life

Active Publication Date: 2017-05-10
桂林金格电工电子材料科技有限公司
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Problems solved by technology

But there are following problems in this method: 1. the 0.05~0.15% trace activated sintering element nickel added is difficult to disperse uniformly in the process of mechanical mixing; During the mechanical mixing process, due to the hindrance of copper powder, the probability of tungsten particles capturing nickel is greatly reduced; ③After mechanical mixing, it is difficult to avoid the enrichment of copper
Therefore, during subsequent infiltration and sintering, the activated sintering effect of the tungsten skeleton will be greatly reduced, and the tungsten particles in contact with each other in the tungsten skeleton cannot be sintered into one, so the high-temperature mechanical strength of the prepared copper and tungsten will also be greatly reduced. The degree of dispersion is not high enough

Method used

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  • A kind of preparation method of copper tungsten contact material
  • A kind of preparation method of copper tungsten contact material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 20kg of tungsten powder with an average particle size of 2μm, combine tungsten powder, 200kg of φ6~φ30mm (the weight ratio is φ6mm:φ10mm:φ20mm:φ30mm=3:5:1:1) high-purity nickel balls, and 3000ml of deionized water Put them together into a 100-liter roller ball mill for ball milling (rotation speed is 45 rpm), the ball milling time is 24 hours, take out the powder and dry it at 150°C for 2 hours, and place the dried powder in a hydrogen atmosphere at 700°C Anneal for 2 hours (after testing, the nickel content in the obtained powder material is 0.55%), use 2T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a graphite boat, and sinter at 1300°C for 1 hour in a hydrogen atmosphere to obtain a tungsten skeleton. Put the tungsten skeleton blank in the graphite boat and add Corresponding mass of copper sheet (57% of the weight of the tungsten skeleton) is infiltrated in a hydrogen atmosphere at 1200° C. for 2 hours, thereby producing a...

Embodiment 2

[0030] Weigh 20kg of tungsten powder with an average particle size of 9 μm, put tungsten powder, 80kg of φ20mm high-purity nickel balls, and 2400ml of deionized water together into a 50-liter roller mill for ball milling (the speed is 50 rpm), and the ball milling time is 12 hours. Take out the powder and dry it at 80°C for 4 hours, place the dried powder in a hydrogen atmosphere and anneal at 850°C for 1 hour (the nickel content in the obtained powder material is 0.15% after testing), use 4T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a graphite boat, sinter at 1450°C for 1 hour in an ammonia decomposition gas atmosphere to obtain a tungsten skeleton, and place the tungsten skeleton blank in a graphite boat And add the corresponding quality of copper sheet (24% of the weight of the tungsten skeleton), and infiltrate it at 1250°C for 1 hour in the atmosphere of ammonia decomposition gas, so that the copper-tungsten 85 contact can be produ...

Embodiment 3

[0032] Weigh 20kg of tungsten powder with an average particle size of 6μm, put the tungsten powder, 160kg of φ10mm high-purity nickel balls, and 2600ml of deionized water into a 100-liter roller ball mill for ball milling (rotational speed is 45 rpm), and the ball milling time is 48 hours , take out the powder and dry at 100°C for 3 hours, place the dried powder in an ammonia decomposition gas atmosphere and anneal at 800°C for 1.5 hours (after testing, the nickel content in the obtained powder material is 0.96%), use 3T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a graphite boat, and sinter at 1400°C for 2 hours in a hydrogen atmosphere to obtain a tungsten skeleton (such as figure 1shown), put the tungsten skeleton billet in the graphite boat and add the corresponding mass of copper sheet (31% of the weight of the tungsten skeleton), and infiltrate it at 1250°C for 1 hour in the hydrogen atmosphere, thus the copper tungsten 80 contact...

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Abstract

The invention discloses a preparation method of a copper-tungsten contact material. The method comprises the steps of performing ball grinding on tungsten powder, high-purity nickel balls and water in a ball grinding machine, and performing drying, annealing, forming, pre-sintering and infiltration treatment on the tungsten powder subjected to ball grinding, wherein the weight ratio of the high-purity nickel balls to the tungsten powder is (4-10) to 1; the use amount of the water is calculated according to a fact that every 1kg of tungsten powder is added to 120-150ml of water; and the ball grinding is executed for 12-48 hours. By the adoption of the special ball grinding technology, adding of nickel and ball grinding are simultaneously executed; furthermore, the added nickel can uniformly cover the surface of the tungsten particles, so that the activated sintering effect of a tungsten framework is effectively enhanced, and a tungsten framework with high performance can be obtained; the copper-tungsten contact material prepared by performing infiltration treatment on the tungsten framework and a copper sheet has a tissue structure that the tungsten particles are uniformly distributed on a copper base body, so that the prepared contact material is perfect in arc erosion resistance and high in high-temperature mechanical strength.

Description

technical field [0001] The invention relates to a method for preparing a copper-tungsten contact material, belonging to the field of metal-based composite materials. Background technique [0002] Due to the high melting point of tungsten and strong arc erosion resistance, and copper has excellent electrical and thermal conductivity, copper tungsten materials have both good arc erosion resistance and electrical and thermal conductivity, so copper tungsten contact materials are widely used as arc contacts. Applied to SF 6 On the high-voltage circuit breaker, it plays the role of turning on and breaking the current. Because in the process of switching on and breaking the current, on the one hand, all the arcs generated are borne by the arc contacts, and the contacts are subject to arc erosion, high temperature and thermal stress; on the other hand, due to the mutual impact of the moving and static contacts The contact is also subject to mechanical stress, and the failure of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H11/04H01H69/00C22C1/04C22C27/04
CPCC22C1/045H01H11/048H01H69/00
Inventor 陈名勇颜培涛贾波吴春涛林毓
Owner 桂林金格电工电子材料科技有限公司
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