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Method for synergistically improving arc ablation performance of CuW contact material

A technology of arc ablation and contact material, which is applied in the direction of contacts, circuits, electric switches, etc., can solve the problems of unfavorable high-voltage circuit breakers and the decline of electrical properties of contact materials, so as to improve the performance of arc ablation resistance and mechanical strength. Performance, the effect of improving the protective effect

Active Publication Date: 2018-12-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the trade-off relationship between the mechanical properties and electrical properties of copper-tungsten contact materials, especially the arc ablation performance, alloying and grain refinement improve the strength of copper-tungsten contact materials, which will inevitably promote Scattering of electrons, resulting in a decrease in the electrical properties of the contact material
This is extremely unfavorable for high-voltage circuit breakers with higher and higher voltage levels and breaking currents

Method used

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  • Method for synergistically improving arc ablation performance of CuW contact material
  • Method for synergistically improving arc ablation performance of CuW contact material
  • Method for synergistically improving arc ablation performance of CuW contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The method of the present embodiment comprises the following steps:

[0043] Step 1. Preparation of tungsten-copper modified mixed powder: Put 50g of spherical electrolytic copper powder with a particle size of 48 μm into a planetary high-energy ball mill and grind it into flakes, then add 50 g of reduced tungsten powder with a particle size of 7 μm for ball milling and mix evenly. Obtain tungsten-copper modified mixed powder; the rotating speed of the ball mill is 400rpm, the time of ball milling is 10h, and the grinding balls adopted in the process of the ball mill are large balls with a diameter of 8mm, medium balls with a diameter of 3mm and small balls with a diameter of 1mm , the total mass of the large ball, the total mass of the medium ball and the total mass of the small ball are respectively 250g, 150g and 100g;

[0044] Step 2, preparing graphene oxide: 300-mesh expanded graphite is sequentially subjected to low-temperature, medium-temperature and high-temper...

Embodiment 2

[0066] The method of the present embodiment comprises the following steps:

[0067] Step 1. Preparation of tungsten-copper modified mixed powder: Put 30g of spherical electrolytic copper powder with a particle size of 48 μm into a planetary high-energy ball mill and grind it into flakes, then add 70g of reduced tungsten powder with a particle size of 7 μm for ball milling and mix evenly. Obtain tungsten-copper modified mixed powder; the rotating speed of the ball mill is 500rpm, the time of ball milling is 8h, and the grinding balls adopted in the process of the ball mill are large balls with a diameter of 8mm, medium balls with a diameter of 3mm and small balls with a diameter of 1mm , the total mass of the large ball, the total mass of the medium ball and the total mass of the small ball are respectively 250g, 150g and 100g;

[0068] Step 2, preparing graphene oxide: 300-mesh expanded graphite is sequentially subjected to low-temperature, medium-temperature and high-temperat...

Embodiment 3

[0078] The method of the present embodiment comprises the following steps:

[0079] Step 1. Preparation of tungsten-copper modified mixed powder: Put 10g of spherical electrolytic copper powder with a particle size of 48 μm into a planetary high-energy ball mill and grind it into flakes, then add 90 g of reduced tungsten powder with a particle size of 7 μm for ball milling and mix evenly. Obtain tungsten-copper modified mixed powder; the rotating speed of the ball mill is 600rpm, the time of ball milling is 5h, and the grinding balls adopted in the process of the ball mill are large balls with a diameter of 8mm, medium balls with a diameter of 3mm and small balls with a diameter of 1mm , the total mass of the large ball, the total mass of the medium ball and the total mass of the small ball are respectively 250g, 150g and 100g;

[0080] Step 2, preparing graphene oxide: 300-mesh expanded graphite is sequentially subjected to low-temperature, medium-temperature and high-tempera...

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Abstract

The invention discloses a method for synergistically improving the arc ablation performance of a CuW contact material. The method comprises the steps that firstly, spherical electrolytic copper powderis rolled into a sheet, then reduced tungsten powder is added for ball milling, even mixing is conducted, and tungsten-copper modified mixed powder is obtained; secondly, expanded graphite is sequentially subjected to low temperature intercalation oxidation, medium temperature intercalation oxidation and high temperature intercalation oxidation, and graphene oxide is obtained; thirdly, the tungsten-copper mixed powder and the graphene oxide are added into an ethanol-water mixed solution to be mixed evenly, drying is conducted, graphene oxide / tungsten-copper composite powder is obtained and then subjected to low-temperature thermal reduction, and reduced graphene oxide / tungsten-copper composite powder is obtained; and fourthly, the reduced graphene oxide / tungsten-copper composite powder issubjected to discharge plasma liquid phase sintering, and the CuW contact material is obtained. The graphene oxide is added into the tungsten-copper modified mixed powder, thermal reduction is conducted at first, the reduced graphene oxide is obtained, then discharge plasma liquid phase sintering is conducted, tungsten carbide nanoparticles are generated, and the arc ablation performance and mechanical performance of the CuW contact material are synergistically strengthened through the reduced graphene oxide and the tungsten carbide nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and in particular relates to a method for synergistically improving the arc ablation performance of CuW contact materials. Background technique [0002] The rapid development of modern industry has put forward higher performance requirements for structural and functional materials, especially making high-conductivity, high-strength and high-temperature-resistant materials a research hotspot, and the research on refractory metals and their composite materials is the most extensive. Tungsten-copper composite material is a pseudo-alloy formed by uniform mixing of incompatible tungsten and copper phases. It has both the intrinsic physical properties of tungsten and copper, and its composition and performance can be flexibly and accurately designed. It is widely used in military and aerospace, electronics, rail transportation and other fields. [0003] Copper-tungsten composite mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C9/00C22C27/04H01H1/021H01H1/025H01H1/027B22F3/10
CPCB22F3/1035B22F2003/1051C22C1/05C22C9/00C22C27/04H01H1/021H01H1/025H01H1/027
Inventor 董龙龙张于胜霍望图卢金文张伟杜岩
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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