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Graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material and preparation method thereof

An electrical contact material and graphene technology are applied in the field of graphene oxide reinforced disperse copper tungsten-chromium electrical contact materials and their preparation, which can solve the problems of poor affinity and interface bonding force, prone to agglomeration and the like, and achieve good wetting. performance, optimized bonding interface, and excellent overall performance

Inactive Publication Date: 2019-08-27
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the affinity and interface binding force between graphene and copper matrix is ​​very poor, and it is easy to agglomerate during the preparation process. The dispersion in copper matrix and the wettability of the interface have always restricted its application.

Method used

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  • Graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material and preparation method thereof
  • Graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material and preparation method thereof
  • Graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material and preparation method thereof

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Experimental program
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preparation example Construction

[0036] A preparation method of graphene oxide reinforced dispersed copper tungsten chromium electrical contact material includes the following steps:

[0037] (1) Ingredients

[0038] According to the mass percentage, weigh 56.5-57% Cu-0.4wt.% Al alloy powder, 35% W powder, 5% Cr powder, 0.1-0.5% graphene oxide and 2.5-3.4% Cu 2 O powder, spare;

[0039] Among them, Cu-0.4wt% Al alloy powder has a particle size of 38 μm, tungsten powder has a particle size of 2-5 μm, chromium powder has a particle size of 44 μm, and Cu 2 The particle size of the O powder is 2-5μm, the graphene oxide is a single-layer graphene oxide, the sheet diameter is 0.5-5μm, and the thickness is 0.8-1.2 nm. Weigh each raw material (the calculation method for weighing is the volume of the part×theoretical density×the ratio of addition). The raw material ratio of graphene oxide / dispersed copper tungsten chromium electrical contact material is shown in Table 1 below.

[0040] Composite material compositionCu-...

Embodiment 1

[0054] The preparation size is Ø50×10 mm, 0.1GO / Al doped with 0.1% graphene oxide 2 O 3 -Cu / (35)W(5)Cr electrical contact material.

[0055] The specific preparation method is:

[0056] Step 1, ingredients

[0057] Calculate the respective amounts of copper-aluminum alloy powder, cuprous oxide powder, tungsten powder, and chromium powder in proportion, the amount of copper-aluminum alloy powder=part volume×theoretical density×addition ratio=19.63 cm 3 ×10.53 g / cm 3 ×57.05%=117.92g, tungsten powder=part volume×theoretical density×addition ratio=19.63 cm 3 ×10.53 g / cm 3 ×35%=72.35g, chromium powder=part volume×theoretical density×addition ratio=19.63 cm 3 ×10.53 g / cm 3 ×5%=10.34g, cuprous oxide powder=part volume×theoretical density×addition ratio=19.63 cm 3 ×10.53 g / cm 3 ×2.85%=5.89g, the amount of graphene oxide=part volume×theoretical density×addition ratio=19.63cm 3 ×10.53 g / cm 3 ×0.1%=0.21g.

[0058] Step 2. Mix

[0059] Mix the copper-aluminum alloy powder, tungsten powder, chromium...

Embodiment 2

[0070] The preparation size is Ø50×10 mm, 0.3GO / Al doped with 0.3% graphene oxide 2 O 3 -Cu / (35)W(5)Cr electrical contact material.

[0071] The specific preparation method is:

[0072] Step 1, ingredients

[0073] Calculate the respective amounts of copper-aluminum alloy powder, cuprous oxide powder, tungsten powder, and chromium powder in proportion, the amount of copper-aluminum alloy powder=part volume×theoretical density×addition ratio=19.63cm 3 ×10.46g / cm 3 ×56.85%=116.73g, tungsten powder=part volume×theoretical density×addition ratio=19.63cm 3 ×10.46g / cm 3 ×35%=71.87g, chromium powder=part volume×theoretical density×addition ratio=19.63cm 3 ×10.46g / cm 3 ×5%=10.27g, cuprous oxide powder=part volume×theoretical density×addition ratio 19.63cm 3 ×10.46g / cm 3 ×2.84%=5.83g, the amount of graphene oxide=part volume×theoretical density×addition ratio=19.63cm 3 ×10.46g / cm 3 ×0.3%=0.62g.

[0074] Step 2. Mix

[0075] Mix the copper-aluminum alloy powder, tungsten powder, chromium powder a...

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Abstract

The invention relates to a graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material. A preparation process comprises the following steps of uniformly mixing copper aluminumalloy powder, tungsten powder, chromium powder and cuprous oxide powder for standby application; adding ultrasonically dispersed graphene oxide into pre-mixed powder and transferring the mixture to aball-milling tank to be ball-milled; then freezing and drying the mixture; and carrying out vacuum hot press sintering to obtain the graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material. According to the graphene oxide enhanced dispersed copper-tungsten-chromium electric contact material, by adding the graphene oxide into the copper aluminum tungsten chromium mixedpowder for vacuum hot press sintering, an internal oxidization process is simplified. The defects that the affinity and the interface bonding force of graphene and a copper matrix are poor and the electric conducting ability of the graphene oxide is poor are overcome, and the graphene oxide reduced in a vacuum high-temperature condition improves the comprehensive performance of the dispersed copper-tungsten-chromium electric contact material. In addition, the experimental process is simple, small in energy consumption, obvious in performance improvement, high in production efficiency and easyfor industrial production.

Description

Technical field [0001] The invention belongs to the technical field of preparation of electrical materials, and specifically relates to a graphene oxide reinforced dispersed copper tungsten chromium electrical contact material and a preparation method thereof. Background technique [0002] Copper-based composite materials have always been considered as ideal electrical contact materials due to their high conductivity. Nano Al 2 O 3 The reinforced dispersed copper-based composite material not only has high strength and high conductivity, but also has a high recrystallization temperature and good thermal stability. It is a class of functional materials with excellent comprehensive properties. Tungsten has high melting point, high density and low expansion coefficient. The electrical contact material made of tungsten copper has high compressive strength and strong arc ablation resistance. As the copper evaporates and melts under the action of the electric arc, the copper-tungsten co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C9/00C22C1/05C22C1/10
CPCC22C1/05C22C9/00C22C32/0084
Inventor 张毅张晓辉田保红刘勇薛慧慧赵转李红霞安俊超李丽华殷婷高直付明王智勇宋克兴耿永峰班宜杰孙航
Owner HENAN UNIV OF SCI & TECH
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