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Nanometer tungsten carbide silver contact material and manufacturing method

A nano-tungsten carbide and silver contact technology, applied in electrical components, circuits, electrical switches, etc., to achieve the effect of suppressing excessive cold welding, good electrical conductivity, and improving powder yield

Inactive Publication Date: 2016-06-15
ZHEJIANG YATONG METAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation and research of nano-tungsten carbide silver contact materials have not been reported at home and abroad.

Method used

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  • Nanometer tungsten carbide silver contact material and manufacturing method
  • Nanometer tungsten carbide silver contact material and manufacturing method
  • Nanometer tungsten carbide silver contact material and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Choose the tungsten carbide powder that average particle size is 1.06 μ m, particle size be-300 mesh silver powder and particle size be-200 mesh nickel powder, be 2kg by gross weight, weight ratio is silver: tungsten carbide: nickel=50:49:1, weighs Put tungsten carbide powder and nickel powder into a ball mill jar, add 150ml of alcohol and 10kg of Ф6mm hard alloy balls, install the ball mill jar on the planetary ball mill, and continue ball milling for 48 hours at a speed of 250r / min; take out the powder Dry at 120°C for 2 hours, put the dried powder and silver powder weighed in proportion, 0.04kg of stearic acid and 20kg of Ф6 hard alloy balls into a ball mill jar, seal the ball mill jar, and vacuumize , install the ball mill jar on the planetary ball mill, and mill continuously for 12 hours at a speed of 250r / min; take out the mixed powder and reduce it for 1.5 hours under the condition of hydrogen atmosphere and temperature of 400°C; use 3T / cm 2 The pressure of the m...

Embodiment 2

[0043] Choose tungsten carbide powder whose average particle size is 5.32 μm, particle size be-200 mesh silver powder and particle size be-100 mesh nickel powder, be 2kg by total weight, weight ratio silver: tungsten carbide: nickel=30:68:2, weigh carbonization Put tungsten powder and nickel powder into a ball mill jar, add 200ml of alcohol and 6kg of Ф20mm hard alloy balls, install the ball mill jar on the planetary ball mill, and continue ball milling for 36 hours at a speed of 350r / min; take out the powder Dry at 150°C for 1.5 hours, put the dried powder and previously weighed silver powder, 0.08kg of stearic acid and 20kg of Ф20 hard alloy balls into a ball mill jar, seal the ball mill jar, and evacuate it. Install the ball mill jar on the planetary ball mill, and mill continuously for 18 hours at a speed of 350r / min; take out the mixed powder and reduce it for 1 hour at a temperature of 450°C in a hydrogen atmosphere; use 4T / cm 2 The pressure of the mixed powder is presse...

Embodiment 3

[0045] Choose the tungsten carbide powder whose average particle size is 2.54 μm, the silver powder and the particle size of-300 mesh nickel powder and the particle size of 2.54 μm, by a total weight of 2kg, the weight ratio is silver: tungsten carbide: nickel=40:58:2, weighed Put tungsten carbide powder and nickel powder into the ball mill jar, add 180ml of alcohol and 12kg of hard alloy balls with a combination of Ф6~Ф20mm (the weight ratio is Ф6:Ф10:Ф20=4:5:1), and install the ball mill jar On a planetary ball mill, ball milling was continued at a speed of 300r / min for 60 hours; the powder was taken out and dried at 120°C for 3 hours, and the SEM photo of the obtained powder was as follows: figure 2 As shown; the cemented carbide balls that combine the dried powder and the previously weighed silver powder with 0.06kg of stearic acid and 20kg of Ф6~Ф20mm (weight ratio Ф6:Ф10:Ф20=4:5:1) Put into the ball mill jar, seal the ball mill jar, and evacuate it, install the ball mil...

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Abstract

A nano-tungsten carbide silver contact material and a preparation method thereof, wherein the tungsten carbide silver contact material is mainly composed of tungsten carbide powder, nickel powder, silver powder and stearic acid powder and is ball-milled to obtain a nano-WC / Ag composite powder, After reduction, pressing, sintering, re-pressing, and re-firing, nano-tungsten carbide silver electrical contacts are obtained. The weight ratio of tungsten carbide to silver is 40-80:20-60, and the particle size of the tungsten carbide phase is 50-500nm; The addition of the nickel powder is 0-2% of the mass percentage of the tungsten carbide powder; the addition of the stearic acid powder is 0.5-5% of the mass percentage of the tungsten carbide-silver-nickel mixed powder; the preparation method is: Weigh tungsten carbide powder and nickel powder, cemented carbide balls and alcohol according to the proportion and place them in a planetary high-energy ball mill for 12-72 hours. Take out the mixed powder and dry it, mix it with silver powder and stearic acid powder in a specific proportion and place it on a planetary ball mill. Milled in a high-energy ball mill for another 6-24 hours, the nano-WC / Ag composite powder obtained after ball milling is processed by reduction, pressing, sintering, re-pressing, and re-sintering to obtain uniform structure, high density, high hardness, and good electrical conductivity. , Nano-tungsten carbide silver electrical contacts with good anti-welding properties.

Description

technical field [0001] The invention relates to a novel nanometer tungsten carbide silver contact material and a preparation process, belonging to the technical field of metal matrix composite materials. Background technique [0002] Because tungsten carbide has a high melting point and strong electrical corrosion resistance, and silver has excellent electrical and thermal conductivity, tungsten carbide silver material has both good electrical corrosion resistance and electrical and thermal conductivity, so tungsten carbide silver contact material is widely used Applied to circuit breakers, contactors and other electrical switches. The electrical contact is the core component of the electrical switch, which plays the role of connecting, carrying and segmenting the current. Its performance largely determines the performance of the electrical switch and the reliability of its operation. Electrical switches require electrical contact materials to have good electrical and therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C5/06C22C30/00C22C32/00C22C1/05B22F9/04H01H11/04
CPCC22C29/08B22F9/04B22F2009/043C22C1/05C22C5/06C22C30/00C22C32/0052H01H11/048
Inventor 吴彩霞余贤旺朱荣郭宽红丁枢华
Owner ZHEJIANG YATONG METAL CERAMICS
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