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Mixed dispersion enhanced copper-tungsten-chromium electrical contact material and preparation method thereof

An electric contact material, dispersion enhancement technology, applied in the direction of contacts, circuits, electric switches, etc., can solve the problem of low conductivity, achieve the effect of excellent comprehensive performance, refined grain, and increased hardness

Inactive Publication Date: 2019-11-22
HENAN UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

Chinese patent (publication number CN 106498209 A) discloses a preparation method of graphene-doped tungsten-copper alloy. The preparation method is to mix copper powder, tungsten powder and nickel-coated graphene powder, press molding, and then perform high-temperature liquid Phase infiltration and sintering to prepare graphene tungsten-copper alloy. The prepared alloy has higher hardness, but its conductivity is lower

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  • Mixed dispersion enhanced copper-tungsten-chromium electrical contact material and preparation method thereof
  • Mixed dispersion enhanced copper-tungsten-chromium electrical contact material and preparation method thereof

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preparation example Construction

[0033] A method for preparing a mixed dispersion enhanced copper tungsten chromium electrical contact material, comprising the following steps:

[0034] (1) Ingredients

[0035] According to the distribution ratio of mass percentage, respectively weigh 55.7-57% Cu-0.4wt.% Al alloy powder, 35% W powder, 5% Cr powder, 0.1-0.5% graphene oxide, 0.1-0.5% Cerium oxide powder, 0.1-0.5% yttrium oxide powder and 1.5-4% Cu 2 O powder, spare;

[0036] Among them, Cu-0.4wt% Al alloy powder particle size is 38 μm, tungsten powder particle size is 2-5 μm, chromium powder particle size is 44 μm, Cu 2 The particle size of O powder is 2-5 μm, graphene oxide is single-layer graphene oxide, sheet diameter is 0.5-5 μm, thickness is 0.8-1.2 nm, CeO 2 Powder particle size 2-5um, Y 2 o 3The particle size of the powder is 2-5um. Weigh each raw material (the calculation method of the weighed amount is the volume of the part × the theoretical density × the ratio of addition). The raw material ra...

Embodiment 1

[0053] Preparation of 0.1GO / Al doped with 0.1% graphene oxide with a size of Ø50×10 mm 2 o 3 - Cu / (35)W(5)Cr electrical contact material.

[0054] The specific preparation method is:

[0055] Step 1, Ingredients

[0056] 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 × ratio of addition = 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, chrome powder = part volume × theoretical density × ratio of addition = 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 × ratio of addition = 19.63 cm 3 ×10.53 g / cm 3 ×0.1%=0.21g.

[0057] Step 2, Mix

[00...

Embodiment 2

[0069] Preparation of 0.3GO / Al doped with 0.3% graphene oxide with a size of Ø50×10 mm 2 o 3 - Cu / (35)W(5)Cr electrical contact material.

[0070] The specific preparation method is:

[0071] Step 1, Ingredients

[0072] 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 × ratio of addition = 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, chrome 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 × ratio of addition = 19.63cm 3 ×10.46g / cm 3 ×0.3%=0.62g.

[0073] Step 2, Mix

[0074] Mix the copper-alumi...

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Abstract

The invention discloses a mixed dispersion enhanced copper-tungsten-chromium electrical contact material and a preparation method thereof. The preparation method comprises the following steps of mixing an ultrasonically dispersed graphene oxide suspension with copper-aluminum powder, cuprous oxide powder, tungsten powder, chromium powder, cerium oxide powder and yttrium oxide powder, carrying outball milling, freezing and drying on the mixture, and carrying out vacuum hot-pressing sintering to obtain the copper-tungsten-chromium electric contact material. According to the electric contact material, the graphene oxide and the rare earth oxide are added into the copper-aluminum-tungsten-chromium mixed powder, the vacuum hot-pressing sintering - simple internal oxidation process are carriedout, so that the defects of poor affinity and interface binding force between graphene and copper matrix and poor conductivity of graphene oxide are overcome, and the comprehensive performance of thedispersed copper-tungsten-chromium electrical contact material is improved by the reduced graphene oxide under the vacuum high-temperature condition; and in addition, due to addition of the rare-earthcerium oxide and the yttrium oxide, the crystal grains of the contact material can be effectively refined, the strength and the hardness are improved, the electric arc ablation is reduced, the anti-fusion welding performance of a contact is improved, and the comprehensive performance is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrical materials, in particular to a mixed reinforced dispersed copper tungsten chromium electrical contact material doped with rare earth oxide and graphene oxide and a preparation method thereof. Background technique [0002] Copper-based composite materials have been considered as ideal electrical contact materials because of their high conductivity, and nano-Al prepared by internal oxidation method 2 o 3 Reinforced dispersed copper matrix composites not only have high strength and high conductivity, but also have high recrystallization temperature and good thermal stability. They are a kind of functional materials with excellent comprehensive properties. Tungsten has a 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. The copper-tungsten contact ...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C9/00C22C1/05H01H1/025H01H1/027H01H11/04
CPCB22F2998/10C22C1/05C22C9/00C22C32/00C22C32/0084H01H1/025H01H1/027H01H11/048B22F2009/043B22F3/14
Inventor 田保红张毅张晓辉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张占琦
Owner HENAN UNIV OF SCI & TECH
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