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Graphene/metal based composite contact material as well as preparation method thereof and application thereof

A metal matrix composite, contact material technology, applied in metal material coating process, contacts, circuit breaker contacts, etc., can solve the problems of maximizing the utilization rate of graphene performance, and achieve reduced processing costs and high thermal conductivity. , Improve the performance and life of the effect

Active Publication Date: 2020-07-24
陕西清科智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing technologies have shown that using graphene as a raw material additive can improve the electrical and thermal properties of contact materials, but this method cannot maximize the performance utilization of graphene. Therefore, an industrialized in-situ prepared High-performance and long-life graphene / silver-based composite contact material

Method used

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  • Graphene/metal based composite contact material as well as preparation method thereof and application thereof
  • Graphene/metal based composite contact material as well as preparation method thereof and application thereof
  • Graphene/metal based composite contact material as well as preparation method thereof and application thereof

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preparation example Construction

[0032] A kind of preparation method of graphene / metal matrix composite contact material of the present invention, comprises the following steps:

[0033] S1. Pre-preset pure nickel powder on the surface of the contact material, and prepare a nickel / contact material transition coating by means of laser alloying, such as figure 1 (a) shown.

[0034] Wherein, the contact material includes silver oxide alloy, silver nickel alloy, silver carbon alloy, silver tungsten alloy, silver tungsten carbon alloy.

[0035] The particle size of the preset nickel powder is 1-100 μm, and the preset layer is 50-500 μm.

[0036] The laser alloying method adopts carbon dioxide laser, fiber laser or semiconductor laser.

[0037] The alloying process parameters are: laser spot diameter 30~60μm, laser power density (1~10)×103W / cm 2 , scanning speed 10 ~ 100mm / s.

[0038] S2. Pre-set graphite powder on the surface of the nickel / contact material, and irradiate the graphite powder with a high-power c...

Embodiment 1

[0046] A nickel transition layer was prepared on the AgNi10 alloy by semiconductor laser, and graphene was prepared in situ on the surface of Ni / AgNi10 by semiconductor laser.

[0047] The preparation steps are as follows:

[0048] (1) Nickel alloy layer prepared by semiconductor laser

[0049] Use a high-power continuous semiconductor laser (wavelength 1080nm, maximum power 6000W) to irradiate the surface of AgNi10 alloy pre-prepared with 50μm nickel powder, where the size of AgNi10 is 50×50×5mm 3 . Laser alloying process parameters are: spot diameter 60μm, power density 10 3 W / cm 2 , Scanning speed 10mm / s. Prepared nickel transition coating, see attached figure 2 (a) and (d).

[0050] (2) In-situ preparation of graphene by semiconductor laser

[0051] A high-power continuous semiconductor laser (with a wavelength of 1080nm and a maximum power of 6000W) is used to irradiate the surface of Ni / AgNi10 pre-coated with 5 μm graphite powder. Laser process parameters are: s...

Embodiment 2

[0053] Using CO 2 Laser preparation of nickel transition layer on AgNi10 alloy, followed by CO 2 Laser in situ preparation of graphene on Ni / AgNi10 surface.

[0054] The preparation steps are as follows:

[0055] (1)CO 2 Laser Preparation of Nickel Alloy Layers

[0056] Utilizes high power continuous CO 2 Laser (wavelength 900nm, maximum power 10000W) is irradiated on the surface of AgNi10 alloy pre-prepared with 200μm nickel powder, where the size of AgNi10 is 50×50×5mm 3 . Laser alloying process parameters are: spot diameter 30μm, power density 10×10 3 W / cm 2 , Scanning speed 100mm / s. Prepared nickel transition coating, see attached figure 2 (b) and (e).

[0057] (2) CO 2 Laser in situ preparation of graphene

[0058] Utilizes high power continuous CO 2 Laser (wavelength 900nm, maximum power 10000W) is irradiated on the surface of Ni / AgNi10 pre-coated with 25μm graphite powder. Laser process parameters are: spot diameter 30μm, power density 25×10 3 W / cm 2 , ...

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Abstract

The invention discloses a graphene / metal based composite contact material as well as a preparation method thereof and application thereof. A graphene film and a carbon-rich solid solution are generated on the surface of a metal base through a laser method, so that physical properties of high thermal conductivity and high electrical conductivity as well as excellent mechanical properties of a contact interface of the composite contact material are achieved, defects of an alloy material are made up, and application of graphene special performances is greater in the engineering field. After graphene which is in situ grown through laser is damaged, a carbon source in a metastable-state supersaturated solid solution formed by quickly solidifying is separated out of the surface to re-form a filmunder dual-drive of heat and metastable-state tend-to-be-stable transformation, so that a worn area is made up, and an in-situ self-repair mechanism is formed. The graphene / metal based composite contact material improves electric-arc ablation resistance and fusion welding resistance of the contact material; and the self-repair mechanism is adopted to provide guarantee for contact material wear which appears in inconvenient-to-dismount precise equipment. Theoretical basis and experience guide are provided for upgrading and rebuilding of rail traffic and electrical equipment.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical equipment, and in particular relates to a graphene / metal matrix composite contact material and its preparation method and application. Background technique [0002] Electric contacts are contact elements of electrical switches, instrument components, etc., and their functions include loading current, connecting and breaking current, etc. The performance and service conditions of contact materials directly determine the opening capability, contact safety and reliability of electrical switches, which in turn affect the actual working conditions and service life of the power distribution system. For large-scale traction units with a load of hundreds of kilowatts at the lower end of switching devices in rail transit traction power systems, the contact materials of key components are facing great challenges such as difficult arc breaking and severe arc ablation. The air DC switch used i...

Claims

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Application Information

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IPC IPC(8): C23C24/10H01H1/023H01H1/0237H01H1/027H01H73/04
CPCC23C24/106C23C24/10H01H1/023H01H1/0237H01H1/027H01H73/04
Inventor 叶晓慧羊奕帆杨艳玲锁国权冯雷侯小江张荔
Owner 陕西清科智能科技有限公司
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