Silver-tungsten carbide-nickel contact material and preparation method thereof

A silver tungsten carbide and contact material technology, applied in contacts, electrical components, electrical switches, etc., can solve the problems of short electrical life of circuit breakers, difficult electrical life, and low resistance to arc erosion of AgNiC static contacts. The effect of improving wettability, high density and excellent arc erosion resistance

Active Publication Date: 2015-03-04
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

AI Technical Summary

Problems solved by technology

Due to the low arc corrosion resistance of the static contact AgNiC, the electrical life of the circuit breaker is too short, and it is difficult to exceed 1000 times in general.

Method used

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  • Silver-tungsten carbide-nickel contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select tungsten carbide powder with an average particle size of 1 μm, -200 mesh silver powder and -300 mesh nickel powder, and weigh the silver tungsten carbide nickel with a total weight of 20kg according to the following weight percentages (25% tungsten carbide, 1.55% nickel, and silver as the balance) Powder, powder is put into 30 liters of V type mixers and mixes 2.5 hours, the silver tungsten carbide nickel powder after mixing, the high-purity nickel ball of the φ 6mm of 180kg, 4400ml deionized water are put into 100 liters of roller mills together and carry out ball milling ( Rotation speed is 45 rpm), ball milling time is 30 hours, the powder is taken out and dried at 120°C for 3 hours (after testing, the nickel content in the obtained powder material is 2%), and the dried powder is placed in a hydrogen atmosphere Anneal at 700°C for 2 hours, use 6T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a hydrogen atmosphere and sinte...

Embodiment 2

[0031] Select tungsten carbide powder with an average particle size of 3 μm, -100 mesh silver powder and -300 mesh nickel powder, and weigh the silver tungsten carbide nickel with a total weight of 20kg according to the following weight percentages (27% tungsten carbide, 0.9% nickel, and silver as the balance) Powder, powder is put into 30 liters of V-shaped mixers and mixes 3 hours, the silver tungsten carbide nickel powder after mixing, the high-purity nickel ball of the φ 20mm of 80kg, 3000ml deionized water are put into 100 liters of roller ball mills together and carry out ball milling ( Rotation speed is 45 rpm), ball milling time is 12 hours, the powder is taken out and dried at 150°C for 3 hours, and the dried powder is placed in a hydrogen atmosphere and annealed at 750°C for 1 hour (after testing, the obtained powder material Nickel content is 1%), with 4T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a hydrogen atmosphere and si...

Embodiment 3

[0033] Select tungsten carbide powder with an average particle size of 1 μm, -120 mesh silver powder and -300 mesh nickel powder, and weigh the silver tungsten carbide nickel with a total weight of 20kg according to the following weight percentages (20% tungsten carbide, 4.2% nickel, and silver as the balance) Powder, powder is put into 30 liters of V-shaped mixers and mixes 2 hours, the silver tungsten carbide nickel powder after mixing, the high-purity nickel ball of the φ 30mm of 200kg, 2600ml deionized water are put into 100 liters of roller ball mills together and carry out ball milling ( Rotation speed is 45 rpm), ball milling time is 48 hours, the powder is taken out and dried at 130°C for 2 hours, the dried powder is placed in a hydrogen atmosphere and annealed at 720°C for 2 hours, (after testing, the obtained powder material The nickel content is 5.0%), with 7T / cm 2 Press the annealed powder into a compact in a steel mold, place the compact in a hydrogen atmosphere a...

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Abstract

The invention discloses a silver-tungsten carbide-nickel contact material and a preparation method thereof. The silver-tungsten carbide-nickel contact material is prepared from the following components in percentage by weight: 20-30% of tungsten carbide, 0.1-5% of nickel and the balance of silver. The preparation method of the material comprises the following steps: weighing tungsten carbide powder, nickel powder and silver powder, mixing evenly, putting the silver-tungsten carbide-nickel mixed powder, high-purity nickel balls and water into a ball mill for ball milling, and performing drying, annealing, forming, sintering, re-pressing and re-annealing on the ball-milled powder, thereby obtaining the silver-tungsten carbide-nickel contact material; the weight ratio of the high-purity nickel balls to the silver-tungsten carbide-nickel mixed powder is (4-10): 1; the dosage of the water is calculated according to that 130-220ml of water is added to the silver-tungsten carbide-nickel mixed powder per 1kg; the time of the ball milling is 12-48 hours; and as the nickel lost in ball milling is mixed with the powder, the weight of the weighed nickel powder is 0-92% of that of the nickel in the final silver-tungsten carbide-nickel mixed powder obtained after ball milling.

Description

technical field [0001] The invention relates to a silver tungsten carbide nickel contact material and a preparation method thereof, belonging to the field of metal matrix composite materials. Background technique [0002] Most of the contacts used by medium and low voltage intelligent frame circuit breakers in the prior art are AgW50 and AgNiC, wherein AgW50 is a moving contact and AgNiC is a static contact. Due to the low arc corrosion resistance of the static contact AgNiC, the electrical life of the circuit breaker is too short, and it is difficult to exceed 1000 times in general. With the development of social economy, there are many application occasions that require intelligent frame circuit breakers to have a higher electrical life. In this regard, it is necessary to develop a material with strong arc erosion resistance as the static contact, which is used in conjunction with the AgW50 moving contact, so as to greatly improve the electrical life of the intelligent fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C32/00C22C1/05H01H1/0233
Inventor 陈名勇叶凡罗春华兰岚颜培涛
Owner 桂林金格电工电子材料科技有限公司
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