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Silver-base electric contact head materials

An electrical contact material, silver-based technology, applied in contact materials and other directions, to achieve the effects of improved arc erosion resistance, high self-lubricating performance, and reduced mechanical wear rate

Inactive Publication Date: 2004-12-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this silver-based electrical contact material has not been reported

Method used

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  • Silver-base electric contact head materials
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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the preparation process of one-dimensional nano-carbon material / silver-based electrical contact is:

[0022] The Ag powder of said ratio and the second phase (carbon nanotubes, carbon nanofibers, graphite nanopowder or diamond powder), also comprising the mixture of these carbonaceous materials, and their mixture with common graphite powder, mix homogeneously (ball milling 1 to 10 hours; the present embodiment is 5 hours) respectively cold pressing (under 1000MPa pressure), sintering (300 to 600°C, heat preservation for 1 to 10 hours; the present embodiment is 500°C, heat preservation for 5 hours) and subsequent processing and densification (300-600°C, 800MPa repeatedly hot-pressed; in this example, 3 times hot-pressed at 300°C, 500°C, and 600°C), a silver-based electrical contact material with high wear resistance and arc erosion resistance was obtained. , the basic parameter of the obtained contact material is density 8.0~9.0g / cm 3 , Rockw...

Embodiment 2

[0025] The multi-walled carbon nanotubes prepared by gas-phase decomposition of hydrocarbons are added to the silver-based contact as an additional phase. Mix 95wt% silver powder and 5wt% multi-walled carbon nanotubes (average diameter is 40nm) evenly, use the preparation process of embodiment 1 one-dimensional nanocarbon material / silver-based electrical contact, mix, cold press, sinter into Blank, multi-walled carbon nanotubes / silver electrical contact material prepared by conventional silver contact production processes such as hot extrusion, rolling, etc.

Embodiment 3

[0027] The single-walled carbon nanotubes prepared by gas-phase decomposition of hydrocarbons are added to the silver-based contact as an additional phase. Mix 99wt% silver powder and 1wt% single-walled carbon nanotubes evenly, use the preparation process of the one-dimensional nanocarbon material / silver-based electrical contact in Example 1, go through ball milling, cold pressing, sintering into a billet, repressing, etc. The single-wall carbon nanotube / silver electrical contact material prepared by the process.

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Abstract

A durable wear-resistant and arc erosion-resistant silver based electric contact material consists of carbon material 0.5-20wt% and balanced of silver. One dimension nano carbon material replaces, partially or completely, graphite to be added into the silver based material to form one dimension nano carbon / silver composite material as electric contact material. It has higher electric and heat conductivities, higher strength and better self-lubrication, reduces losses by wear or arc erosion, and can replace graphite silver contact material completely.

Description

technical field [0001] The invention belongs to the field of electrical functional materials, and uses nano-carbon materials such as carbon nanotubes and nano-carbon fibers to replace or partially replace graphite in graphite / silver contact materials. The electrical contact materials have high wear resistance and arc resistance. Aggressive properties of silver-based electrical contact material. Background technique [0002] Graphite-silver alloys have been more and more widely used in recent years. The main characteristics of silver-graphite contacts with a graphite content of 3-10% are high welding resistance, low contact resistance, and small temperature rise. It has self-lubricating properties when used, so it is suitable for switching contacts. It is typically used in low-voltage circuit breakers, reactance protection switches, line protection switches, leakage protection switches, and slip ring converters (GB12940-1991). Silver graphite can be paired with silver nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C5/04H01H1/02
Inventor 王亚平成会明蒋鹏李峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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