Preparation method of silver tungsten contact material

A contact material, silver-tungsten technology, which is applied in the field of preparation of silver-tungsten contact materials, can solve problems such as affecting the health of production operators, unfavorable social sustainable development, sewage treatment environment, etc., and achieves high resistance to arc burning. , high density, the effect of improving wettability

Active Publication Date: 2015-04-01
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are several problems in this treatment method: firstly, the use of toxic chemical substances in the preparation process not only affects the health of production operators, but also causes environmental pollution, which is not conducive to the sustainable development of society; secondly, through chemical After the silver tungsten powder is produced by the reaction, it needs to be washed with pure water. In this process, a large amount of waste water is produced, and there are problems of sewage treatment and environmental pollution.

Method used

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  • Preparation method of silver tungsten contact material
  • Preparation method of silver tungsten contact material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Select tungsten powder with an average particle size of 1 μm and -200 mesh silver powder, weigh 20kg of silver tungsten powder with a total weight of 20kg according to the weight ratio of tungsten: silver = 50:50, put the powder into a 30-liter V-shaped mixer and mix for 2.5 hours Put the mixed silver-tungsten powder, 200kg φ 30mm high-purity nickel balls (nickel content is 99.99%), and 4000ml deionized water together into 100 liters of roller mills and carry out ball milling (rotating speed is 45 rev / min), ball milling time is After 50 hours, take out the powder and dry it at 150°C for 2 hours, place the dried powder in a hydrogen atmosphere and anneal at 850°C for 3 hours (after testing, the nickel content in the obtained powder material is ?0.96%), use 2T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact and the silver sheet in a graphite boat according to the structure of the silver sheet on the bottom of the compact, and infiltrate i...

Embodiment 2

[0030] Select tungsten powder with an average particle size of 9 μm and -100 mesh silver powder, weigh silver tungsten powder with a total weight of 20 kg according to the weight ratio of tungsten: silver = 96:4, put the powder into a 30-liter V-shaped mixer and mix for 2 hours. Combine the mixed silver tungsten powder, 80kg of φ6~φ30mm high-purity nickel balls (with a nickel content of 99.9%) (the weight ratio is φ6mm:φ10mm:φ20mm:φ30mm=3:5:1:1), and 2400ml of deionized water Put it into a 50-liter roller ball mill for ball milling (rotating speed: 50 rpm), the ball milling time is 12 hours, take out the powder and dry it at 80°C for 4 hours, and place the dried powder in an ammonia decomposition gas atmosphere at 700°C Lower annealing for 1 hour (after testing, the nickel content in the obtained powder material is 0.15%), with 4T / cm 2 The annealed powder is pressed into a green compact in a steel mold, and the green compact and the silver sheet are placed in a graphite boat a...

Embodiment 3

[0032]Select tungsten powder with an average particle size of 2 μm and -200 mesh silver powder, weigh silver tungsten powder with a total weight of 20kg according to the weight ratio of tungsten: silver = 70:30, put the powder into a 30-liter V-shaped mixer and mix for 3 hours, Put the mixed silver-tungsten powder, 120kg of φ20mm high-purity nickel balls (nickel content is 99.9%), and 3000ml of deionized water together into a 100-liter roller mill for ball milling (rotating speed is 45 rpm), and the ball milling time is 30 hours , take out the powder and dry at 100°C for 2 hours, place the dried powder in an ammonia decomposition gas atmosphere and anneal at 800°C for 2 hours (the nickel content in the obtained powder material is 0.60% after testing), use 2.5T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact and the silver sheet in a graphite boat according to the structure of the silver sheet on the bottom of the compact, and infiltrate it at ...

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Abstract

The invention discloses a preparation method of a silver tungsten contact material. The method comprises the following steps: mixing silver powder and tungsten powder, carrying out ball milling on the silver-tungsten mixed powder, high-purity nickel balls and water in a ball mill, and carrying out drying, annealing, molding and infiltration treatment on the silver-tungsten mixed powder subjected to ball milling, wherein the weight ratio of the high-purity nickel balls to the silver-tungsten mixed powder is (4-10):1, 120-200ml of water is added to every 1kg of silver-tungsten mixed powder, and the ball milling time is 12-50 hours. The silver-tungsten mixed powder, high-purity nickel balls and water are subjected to ball milling in the ball mill for special time in a specific proportion, so that the silver powder and tungsten powder are mixed more uniformly, the ball milling and additive nickel addition can be implemented at the same time, and the nickel lost on the high-purity nickel balls due to ball milling can be uniformly coated to the tungsten granule surface, thereby achieving the goal of effectively improving the wettability of the tungsten. The obtained material has the advantages of uniform structure, high density and low resistivity.

Description

technical field [0001] The invention relates to a preparation method of a silver-tungsten contact material, which belongs to the field of metal matrix composite materials. Background technique [0002] Due to the high melting point of tungsten and strong electrical corrosion resistance, and silver has excellent electrical and thermal conductivity, silver tungsten materials have both good electrical corrosion resistance and electrical and thermal conductivity, so silver tungsten contact materials are widely used in low-voltage contact materials. Molded case circuit breakers, frame circuit breakers. The contact plays the role of connecting, carrying and breaking the current, and is the heart part of the circuit breaker. Its performance determines the performance of the circuit breaker and its operation reliability to a large extent. Therefore, the circuit breaker has strict requirements on the contacts, which require: ① good resistance to arc burnout, ② high resistance to wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C5/06
Inventor 陈名勇贾波吴春涛颜培涛林毓胡全岸兰岚
Owner 桂林金格电工电子材料科技有限公司
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