Preparation method of fibriform metal copper oxide enhanced silver-based electric contact material

A technology of electrical contact materials, copper oxide, applied in contacts, circuits, electric switches, etc., can solve the problems of unsatisfactory comprehensive performance, reduction of total metal oxides, poor resistance to arc erosion, etc., and achieve the solution of metal oxides loss, improved arc erosion resistance, and low product cost

Inactive Publication Date: 2011-01-05
KUNMING UNIV OF SCI & TECH
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the AgCdO electrical contact material has excellent comprehensive performance and is called "universal contact material", it is restricted by the EU ROS directive due to toxicity problems during preparation and use.
Several other silver metal oxide materials have been developed in recent years and are considered to be the best electrical contact materials to replace AgCdO composite materials; although these silver metal oxide composite materials can basically meet the needs of the market, they are not compatible with AgCdO Compared with it, its comprehensive performance is not very ideal, especially in the aspects of arc resistance and arc extinguishing, which need further improvement
[0003] In addition, as far as the traditional silver metal oxide electrical contact materials are concerned, the arc erosion is mainly caused by the metal oxide particles forming a molten pool under the action of the arc, and the splashing or adhesion of the metal oxide occurs during the contact process of the contacts, resulting in The reduction of the total amount of metal oxide in the silver metal oxide electrical contact material causes the failure of the silver metal oxide electrical contact material, which is characterized by poor arc corrosion resistance in use

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take silver copper alloy powder 30% (weight percent), silver oxide 30% (weight percent), silver powder 40% (weight percent) as raw materials, and add 0.05% of the total weight of tungsten, after 10 hours of mixing, wait in the cold It is pressed into a blank in the static press, and the forming pressure of the blank is 300MPa; the blank is sintered into an ingot after 850°C for 4 hours; the ingot is extruded into a wire rod at a pressure of 500MPa and a temperature of 600°C It is drawn into wire (silk) with 200MPa drawing force and 250℃-350℃.

Embodiment 2

[0031] Take silver copper alloy powder 20% (weight percent), silver oxide 20% (weight percent), silver powder 60% (weight percent) as raw materials, and add 0.08% molybdenum (weight percent) as raw materials, and mix for 16 hours , Pressed into a blank in a cold isostatic press, the blank forming pressure is 200MPa; the blank is sintered at 800°C for 8 hours to become an ingot, the ingot is extruded at 450MPa and 500°C into a wire rod, and finally drawn at 150MPa Drawing force, 350℃-450℃ drawing into wire (silk) material.

Embodiment 3

[0033] Using silver copper alloy powder 25% (weight percentage), silver oxide 25% (weight percentage), and silver powder 50% (weight percentage) as raw materials, after 24 hours of mixing, cold isostatic pressing is formed into a green body, and the green body forming pressure is 150MPa The green billet is sintered at 740°C for 5 hours to become an ingot. The billet is extruded into a wire rod at 550MPa and 550°C, and finally drawn into a wire (wire) with a drawing force of 250MPa and 450°C to 700°C.

[0034] The particle size of the silver powder, silver-copper alloy powder, tungsten powder and molybdenum powder in the above embodiments is less than 45 microns. Silver-copper alloy powder (28% copper) can be purchased commercially, or produced by smelting or water atomization of silver-copper alloy Powder technology obtained. The particle size of the silver oxide powder is less than 74 microns.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of a fibriform metal copper oxide enhanced silver-based electric contact material, which is used for preparing the silver copper oxide electric contact material (wires) by taking silver powder and silver and copper alloy powder as raw materials, adding a small number of tungsten and molybdenum elements as performance adjusting elements, taking the silver oxides as a reactant and adopting the steps of mixing, press forming, solid phase in-situ sintering, extruding and drawing. The invention is characterized in that: (1) the formation of the copper oxide and the fibrosis of the copper oxide are finished at a time in the preparation and machining processes; (2) the fibriform distribution of the copper oxide forms a microstructural characteristic with a certain orientation relation to make the metal oxide rooted in a silver matrix, thereby solving the problem of the metal oxide loss of the traditional particle metal oxide in electrical arc corrosion, improving the electrical arc corrosion resistance of the metal oxide and also broadening the application range of the silver metal oxide electric contact material; and (3) the preparation method has the advantages of short flow, low production cost and easy industrialization.

Description

Technical field [0001] The invention relates to the technical field of precious metal-based composite materials, in particular to a preparation method of a fibrous metal copper oxide reinforced silver-based electrical contact material. Background technique [0002] The known silver metal oxide electrical contact materials are all granular metal oxide reinforced silver-based composite materials, such as AgSnO2, AgCdO, AgZnO, AgREO, and the like. Although AgCdO electrical contact materials have excellent comprehensive properties and are called "universal contact materials", their use is restricted by the EU's ROS directive due to toxicity issues during preparation and use. Several other silver metal oxide materials have been developed in recent years and are considered to be the best electrical contact materials to replace AgCdO composite materials. Although these silver metal oxide composite materials can basically meet the needs of the market, they are compatible with AgCdO elect...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C5/06C22C47/14C22C49/00H01H1/0237C22C101/02
Inventor 周晓龙曹建春陈敬超商泽进黎敬涛
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap