Method for sintering high-performance copper-tungsten electrical contact material by spark plasma

A discharge plasma and contact material technology, applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of thermal conductivity, arc ablation resistance and mechanical properties, large difference in melting point, long sintering time, etc. To achieve the effect of short sintering time, fast heating speed and uniform grain

Active Publication Date: 2016-09-28
福建国福天合电气科技有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since tungsten and copper are typical pseudo-alloys, the two are incompatible with each other, and the melting points of the two have a large difference. Therefore, it is difficult to obtain a higher density (relative density <97% ), which adversely affects the thermal conductivity, arc ablation resistance and mechanical properties of the material, and the sintering time is long, the energy consumption is large, and most of them use sintering aids

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

[0019] Copper-tungsten composite powder is prepared by mixing tungsten powder with mass ratio of 70% and copper powder with 30% content, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 60 MPa to the copper-tungsten composite powder, and vacuumize the sintering furnace, and the vacuum degree is lower than 10 -1 Under the condition of Pa, the temperature was raised to 900°C at a heating rate of 300°C / min, kept for 25 minutes, and finally cooled to room temperature with the furnace to prepare copper-tungsten electrical contact materials.

[0020] Embodiment 1 makes the performance of copper-tungsten electrical contact material as follows:

[0021] Density: 99%;

[0022] Conductivity: 4.7μΩ.cm;

[0023] Hardness (HB): 242.

Embodiment 2

[0025] Prepare copper-tungsten composite powder with 80% tungsten powder and 20% copper powder by mass ratio, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 20 MPa to the copper-tungsten composite powder, and vacuumize the sintering furnace, and the vacuum degree is lower than 10 -1 Under the condition of Pa, the temperature was raised to 1200°C at a heating rate of 100°C / min, kept for 5 minutes, and finally cooled to room temperature with the furnace to prepare copper-tungsten electrical contact materials.

[0026] Embodiment 2 makes the performance of copper-tungsten electrical contact material as follows:

[0027] Density: 97%;

[0028] Conductivity: 4.3μΩ.cm;

[0029] Hardness (HB): 262.

Embodiment 3

[0031] Copper-tungsten composite powder is prepared by mixing tungsten powder with mass ratio of 75% and copper powder with 25% content, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 40MPa to the copper-tungsten composite powder, pass inert gas into the sintering furnace, raise the temperature to 1100°C at a heating rate of 200°C / min, keep it for 15min, and finally cool down with the furnace to room temperature, the copper-tungsten electrical contact material is prepared.

[0032] Embodiment 3 makes the performance of copper-tungsten electrical contact material as follows:

[0033] Density: 98.5%;

[0034] Conductivity: 4.6μΩ.cm;

[0035] Hardness (HB): 256.

[0036] The density of the copper-tungsten alloy electrical contact material is measured by the Archimedes method, the electrical conductivity of the material is measured by the FQR7501A eddy current conductivity meter, and the hardness of the mat...

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
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for adopting discharge plasma sintering high-performance copper-tungsten electrical contact materials. The method comprises preparing copper-tungsten composite powder from tungsten powder and copper powder and putting them into a graphite mold; putting the graphite mold into a discharge plasma sintering furnace , apply a pressure of 20-60MPa to the copper-tungsten composite powder, pass inert gas or vacuumize the sintering furnace, the sintering temperature is 900-1200°C, keep warm for 5-25min, and finally cool to room temperature with the furnace to obtain copper-tungsten electrical contact material. Compared with the traditional sintering process, the spark plasma sintering method is a sintering technology that integrates hot pressing, plasma activation and resistance heating, so it has the characteristics of fast heating speed, short sintering time and uniform grains, which is beneficial to control the sintering of the sintered body. Fine structure, resulting in a material with high density and good performance.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for spark plasma sintering a high-performance copper-tungsten alloy electrical contact material. Background technique [0002] With the continuous construction of my country's west-to-east power transmission, north-south mutual supply, and cross-regional networking, the load of my country's high-voltage power transmission and transformation network is increasing day by day, and the system capacity is constantly increasing. Key trends in power transmission. For electrical contacts, key components of power systems, W-Cu contact materials are widely used in various circuit breakers and vacuum load switches due to their excellent properties such as arc erosion resistance, welding resistance and high strength. and on the transformer transfer switch. However, since tungsten and copper are typical pseudo-alloys, the two are incompatible with each other, and the me...

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 Patents(China)
IPC IPC(8): B22F3/105C22C27/04H01H11/04
Inventor 阮秀仕吴鹏曹大力赵清海赵勇胜
Owner 福建国福天合电气科技有限公司
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