Silver tungsten carbide graphite contact material and preparation method thereof

A technology of tungsten carbide graphite and contact material, which is applied in the direction of contacts, electrical components, electric switches, etc., can solve the problems of poor arc corrosion resistance, uneven contact structure, high arc erosion rate, etc., to improve mechanical properties, Improve the physical bonding strength, the effect of simple process

Inactive Publication Date: 2011-02-16
YANGZHOU LEYIN ALLOY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The role of tungsten carbide and graphite is to prevent the bonding and welding of contacts, and do not form any insulation to increase the contact resistance, but tungsten carbide and graphite have a stable arc slope and poor thermal stability in air. Poor arc corrosion resistance is the biggest defect of this mater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation method of novel silver tungsten carbide graphite contact material comprises the following steps:

[0015] (1) Put 1-10 μm tungsten carbide powder, 3-10 μm graphite powder and tungsten in a reaction vessel, add deionized water and 40% hydrazine hydrate, and stir at a speed of 50-200r / min. The flow rate is 5-500ml / min and spraying 50-500g / l silver-ammonia complex solution into the reaction vessel to obtain silver tungsten carbide graphite coating powder solution, so that the weight percentages of silver, tungsten carbide and graphite are respectively 72-85%. 13-24%, 2-4%, tungsten is 0.5-1.5% of the total weight of silver, tungsten carbide and graphite;

[0016] (2) Add deionized water to the silver tungsten carbide graphite coating powder solution to neutral pH=7.0, after cleaning, dry it at 150-300°C, and then grind it into silver tungsten carbide graphite coating in a high-energy ball mill Powder, the ratio of ball to material is: 100-20:1, the speed i...

Embodiment 2

[0021] The preparation method of novel silver tungsten carbide graphite contact material comprises the following steps:

[0022] (1) 1 μm tungsten carbide powder, 3 μm graphite powder and tungsten are placed in a reaction vessel, and deionized water and 40% hydrazine hydrate are added, and the flow rate is 5ml / min to the The reaction vessel is sprayed into 50g / l silver-ammonia complex solution to obtain silver tungsten carbide graphite coating powder solution, so that the weight percentages of silver, tungsten carbide and graphite are respectively 85%, 13%, 2%, and tungsten is silver, tungsten carbide , 1.5% of the total weight of graphite.

[0023] (2) Add deionized water to the silver tungsten carbide graphite coating powder solution to neutral pH=7.0, after cleaning, dry at 150°C, and then grind it into silver tungsten carbide graphite coating powder in a high-energy ball mill, The ball-to-material ratio is: 100:1, the rotational speed is 10r / min, and the ball milling time...

Embodiment 3

[0028] The preparation method of novel silver tungsten carbide graphite contact material comprises the following steps:

[0029] (1) 10 μm tungsten carbide powder, 10 μm graphite powder and tungsten are placed in a reaction vessel, and deionized water and 40% hydrazine hydrate are added, and the flow rate is 500ml / min to the The reaction vessel is sprayed into 500g / l silver-ammonia complex solution to obtain silver tungsten carbide graphite coating powder solution, so that the weight percentages of silver, tungsten carbide and graphite are respectively 72%, 24%, 4%, and tungsten is silver, tungsten carbide , 0.5% of the total weight of graphite;

[0030] (2) Add deionized water to the silver tungsten carbide graphite coating powder solution to neutral pH=7.0, after cleaning, dry it at 300°C, and then grind it into silver tungsten carbide graphite coating powder in a high-energy ball mill, The ball-to-material ratio is: 20:1, the rotational speed is 300r / min, and the ball mill...

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PUM

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Abstract

The invention discloses a novel silver tungsten carbide graphite contact material and a preparation method thereof, which belong to the technical field of electric engineering material. The preparation method comprises the following steps of: putting tungsten carbide powder, graphite powder and tungsten into a reaction vessel; adding deionized water and 40% hydrazine hydrate into the reaction vessel; spraying 50-500 g/l silver ammonia complex solution into the reaction vessel at a flow rate of 5 to 500 ml/min with stirring at a rotating speed of 50 to 200 r/min to coat silver powder on the tungsten carbide graphite, the graphite powder and the tungsten particles; and performing high-energy ball milling, destressing, initial-pressing forming, sintering, re-pressing forming, annealing and re-pressing forming to obtain the contact material, wherein the weight percents of silver, tungsten carbide and graphite in the contact material are 72 to 85 percent, 13 to 24 percent and 2 to 5 percent respectively, and the weight of tungsten is 0.5 to 1.5 percent of the total weight of the silver, the tungsten carbide and the graphite. By using a coating process with a chemical plating principle,the invention improves the physical bonding strength between non-wetting materials, improves chemical properties and physical properties of the materials, greatly optimizes the conductivity and improves the arc erosion resistance.

Description

technical field [0001] The invention relates to a novel silver tungsten carbide graphite contact material and a preparation method thereof, belonging to the technical field of electrical materials. Background technique [0002] Among the electrical contact materials of low-voltage electrical appliances, silver tungsten carbide graphite contact materials are widely used in various molded case circuit breakers, frame-type universal circuit breakers, and automotive electrical appliances. This is because the material has good welding resistance and electrical conductivity, low and stable contact resistance. The role of tungsten carbide and graphite is to prevent the bonding and welding of contacts, and do not form any insulation to increase the contact resistance, but tungsten carbide and graphite have a stable arc slope and poor thermal stability in air. Poor arc corrosion resistance is the biggest defect of this material. In China, the mechanical powder mixing process is gen...

Claims

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Application Information

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IPC IPC(8): B22F3/24H01H1/0233B22F3/16
Inventor 谢平云陈建新陶淳钏张正权
Owner YANGZHOU LEYIN ALLOY TECH
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