Silver-borazon switching apparatus contact material and preparation method thereof

A technology for contact materials and switching electrical appliances, which is applied to contacts, electrical switches, circuits, etc., can solve the problems of complex processing technology, unreasonable microstructure, and difficult processing, and achieve simple preparation technology and good arc erosion resistance. , the effect of excellent comprehensive performance

Inactive Publication Date: 2011-08-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual development and application, it is found that the above-mentioned contact materials have common deficiencies: (1) Under the repeated action of the arc, SnO 2 Concentration of components on the surface of the contact leads to an increase in contact resistance and a higher temperature rise
Both processes have their own advantages and disadvantages: 1) The material prepared by the internal oxidation process has a fine grain structure, but an uneven microstructure along the radial direction of the sample exists, and there is a barren area; there are oxides precipitated at the grain boundary, and its electrical conductivity is low ( It is only half of the conventional material); on the surface of the material, it is also easy to crack and be destroyed along the particle boundary
Due to the unreasonable microstructure of the material, the performance of electrical appliances is poor
2) The powder metallurgy process is not limited by the composition of the components, and the prepared material is evenly dispersed, avoiding the barren area, and the structure is uniform; the preparation process is simple, but the contact density is lower than that of the internal oxidation process, the hardness is lower, and the arc corrosion resistance is poor. Some; the processing technology is complicated, the processing is difficult, the yield is low, the cost is high, and it is not easy to make products such as rivets or sheets that require large deformation
Western European countries tend to use powder metallurgy, and Japan mainly uses internal oxidation, but in recent years, it has also actively developed powder metallurgy products. The problem of price and cost limits the development of internal oxidation manufacturing process

Method used

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  • Silver-borazon switching apparatus contact material and preparation method thereof
  • Silver-borazon switching apparatus contact material and preparation method thereof
  • Silver-borazon switching apparatus contact material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1. Boron nitride (powder particles) is 5% by weight, and the balance is silver (powder particles) ingredients. The average particle size of the above-mentioned powder particles is between 1-100 μm;

[0043] 2. Put boron nitride and silver powder into a ball mill and grind for 3 hours to make them fully mixed;

[0044] 3. Compress the evenly mixed boron nitride and silver powders under a pressure of 200Mpa;

[0045] 4. Sinter the compacted body at 900°C for 4 hours;

[0046] 5. Hot extruding the sintered material to obtain wire or strip. The extrusion ratio was 200.

Embodiment 2

[0048] 1. Boron nitride (nano-spherical powder particles) is 4% by weight, and the balance is silver (powder particles) ingredients. The average particle size of silver powder particles is between 1-100 μm, and the boron nitride powder is spherical nano-boron nitride powder, with an average particle size between 0.03-1 μm;

[0049] 2. Put boron nitride and silver powder into a ball mill and grind for 3 hours to make them fully mixed;

[0050] 3. Compress the evenly mixed boron nitride and silver powders under a pressure of 800Mpa;

[0051] 4. Sinter the compacted body at 900°C for 3 hours;

[0052] 5. Hot extruding the sintered material to obtain wire or strip. The extrusion ratio was 200.

Embodiment 3

[0054] 1. Boron nitride (nano-spherical particles) is 1% by weight, and the balance is silver ingredients. The average particle size of spherical boron nitride powder particles is between 0.03-100 μm;

[0055] 2. Put the boron nitride powder particles into absolute ethanol, then add polyethylene glycol with a volume of 1% ml of absolute ethanol, use ultrasonic stirring for 2 hours, and then dry it for use;

[0056] 3. Melt the dispersed spherical boron nitride powder particles in silver at a melting temperature of 1000°C, mechanically stir for 10 minutes, and cool to shape;

[0057] 4. Drawing the smelted material to the final size wire or strip.

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Abstract

The invention provides a silver-borazon switching apparatus contact material and a preparation method thereof. The material consists of the following materials in percentage by weight: 1 to 15 percent of borazon and the balance of silver. The silver-borazon contact material prepared by the method is a silver-based ceramic compound contact material in which second-phase borazon (BN) particles are dispersed in a silver base body; under the condition that the direct-current is 12V and the lamp load is 8*21W+5*5W (the impact current is 33A and the stable current is 16A), after 200,000 electrical endurance tests, the contact is eroded slightly, and no obvious contact material is transferred; therefore, the silver-borazon contact material has high arc erosion resistance and material transferring resistance as well as comprehensive performance.

Description

technical field [0001] The invention relates to a silver-ceramic electrical contact material and a preparation method thereof, in particular to a silver-boron nitride switch electrical contact material with excellent comprehensive performance of arc ablation resistance, material transfer resistance and a preparation method thereof. Background technique [0002] Electrical contacts are the components in switching appliances that are directly responsible for making and breaking circuits, and play a decisive role in the safe operation of switching appliances. With the development of low-voltage electrical appliances such as relays and contactors in the direction of high power, miniaturization and high reliability, higher performance requirements are also put forward for the supporting contact materials: (1) Good electrical conductivity and thermal conductivity ; (2) Resistance to electrical wear; (3) Strong resistance to fusion welding; (4) Good machinability. This means that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/023C22C5/06C22C1/05C22C1/02
Inventor 骆燕燕孟凡斌
Owner HEBEI UNIV OF TECH
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