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A kind of preparation method of MO nanoparticle reinforced silver-based electrical contact material

A technology of electrical contact materials and nano particles, which is applied in the field of low-voltage electrical contact materials, can solve the problems of the large gap between silver-based electrical contact materials and the comprehensive performance not reaching the excellent level of AgCdO.

Active Publication Date: 2020-10-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the new preparation process makes up for the shortcomings of the traditional preparation process to a certain extent, there is a big gap between the silver-based electrical contact materials prepared by these methods and the expectation.
The main reason is that no matter which method the silver-based electrical contact material obtained, its overall performance cannot reach the excellent level of the traditional electrical contact material AgCdO.

Method used

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  • A kind of preparation method of MO nanoparticle reinforced silver-based electrical contact material

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Embodiment 1

[0018] A preparation method of Mo nanoparticles reinforced silver-based electrical contact material, specifically comprising the following steps: vacuum degree 1 × 10 -5 Under the Pa environment, the commercially available 40nm Mo powder was added to the silver melt at a temperature of 1000 °C according to the proportion of the final material mass percentage of 2%, and electromagnetic stirring was carried out at a stirring frequency of 2 Hz. After stirring for 4 minutes, cast the billet at a pouring temperature of 970°C, and then extrude the billet into a rod billet at an extrusion temperature of 700°C and an extrusion pressure of 900 MPa, and finally use the traditional drawing process to obtain Mo The nanoparticle-reinforced silver-based electrical contact wire has a high density, up to 99% of the theoretical density, and has good ductility, electrical wear resistance and arc erosion.

Embodiment 2

[0020] A preparation method of Mo nanoparticles reinforced silver-based electrical contact material, specifically comprising the following steps: vacuum degree 1 × 10 -5 Under the Pa environment, the commercially available 45nm Mo powder was added to the silver melt at a temperature of 1100 ° C according to the proportion of the final material mass percentage of 8%, and electromagnetic stirring was carried out at a stirring frequency of 4 Hz. After stirring for 6 minutes, cast the billet at a pouring temperature of 990°C, and then extrude the billet into a billet at an extrusion temperature of 750°C and an extrusion pressure of 1100 MPa; finally, the traditional drawing process is used to obtain Mo The nanoparticle-reinforced silver-based electrical contact wire has a high density, up to 99% of the theoretical density, and has good ductility, electrical wear resistance and arc erosion.

Embodiment 3

[0022] A preparation method of Mo nanoparticles reinforced silver-based electrical contact material, specifically comprising the following steps: vacuum degree 1 × 10 -4 Under the Pa environment, the commercially available 50nm Mo powder was added to the silver melt at a temperature of 1050 °C according to the proportion of the final material mass percentage of 12%, and electromagnetic stirring was carried out at a stirring frequency of 3 Hz. After stirring for 8 minutes, cast the billet at a pouring temperature of 980°C, and then extrude the billet into a billet at an extrusion temperature of 800°C and an extrusion pressure of 1500 MPa; finally, the traditional drawing process is used to obtain Mo Nanoparticle-reinforced silver-based electrical contact wires.

[0023] figure 1 The metallographic microstructure of the Mo nanoparticle-reinforced silver-based electrical contact material prepared for this example, the black area in the figure is the Mo phase, and the white area ...

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Abstract

The invention discloses a method for preparing a silver-based electrical contact material reinforced by Mo nanoparticles. Under vacuum conditions, nano-spherical Mo powder is added to a molten silver melt, and then poured after electromagnetic stirring to obtain Mo nanoparticles reinforcement. The ingot of silver-based electrical contacts is prepared into wire or strip by drawing or rolling after extrusion; the biggest advantage of this method is that it can be smelted through existing equipment, and the initial investment is small; and Mo is in the form of particles Evenly distributed in the silver matrix, so that compared with the traditional powder metallurgy electrical contact material, the Ag-Mo electrical contact material has better electrical wear resistance, ductility, and arc erosion resistance than the traditional electrical contact material .

Description

technical field [0001] The invention relates to a preparation method of a Mo nanoparticle-reinforced silver-based electrical contact material, belonging to the technical field of low-voltage electrical contact materials. Background technique [0002] The contact materials in low-voltage electrical switches are mainly silver-based composite materials. The earliest developed and applied Ag / CdO electrical contact materials are restricted by the EU ROS directive because the presence of element Cd will cause environmental pollution and endanger human health. In recent years, Ag / Cu, Ag / Ni, Ag / C, Ag / W, Ag / MeO and other contact materials have replaced traditional Ag / CdO contact materials in some fields. Although these silver-based electrical contact materials can basically meet the needs of the market, the comprehensive performance of these alternative materials is still insufficient compared with Ag / CdO contact materials, which limits the application range of electrical contact mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C5/06
CPCC22C1/02C22C5/06C22C1/12
Inventor 周晓龙熊爱虎阴树标曹建春黎敬涛
Owner KUNMING UNIV OF SCI & TECH
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