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Refining method of second phase chromium in chrome-copper immiscible alloy

A chemical synthesis method, copper-based composite material technology, applied in metal processing equipment, transportation and packaging, graphene and other directions, can solve the problems of reducing the electrical contact performance of alloys, single graphene addition process, etc., to achieve hardness improvement, electrical conductivity, etc. Enhanced, high thermal conductivity effect

Active Publication Date: 2021-11-30
广州东铝轻合金有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the above studies, the addition of graphene improved the hardness and electrical conductivity of copper-chromium alloys. However, due to the simple addition process of graphene, in high-chromium (Cr>5wt.%) copper alloys, the large size of chromium agglomerates significantly reduces the electrical conductivity of the alloy. Contact performance, the simple addition of mixed powder results in only a partial decrease in the second-phase chromium coarseness, and a more refined preparation process is urgently needed to solve the problem of second-phase chromium coarseness

Method used

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  • Refining method of second phase chromium in chrome-copper immiscible alloy

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Embodiment 1

[0029] The mass fraction in the composite material is: 10% chromium powder, 90% copper powder, chromium powder purity 99.9%, particle size 1000 mesh; copper powder purity 99.9%, particle size 200 mesh; graphene oxide 1-3 layers, The particle size is 10 microns, and the added amount is 0.005% by mass of chromium powder. Prepare KH-550 silane coupling agent graphene oxide solution: alcohol-water ratio 0.5:15, KH-550 content is 1.0% by volume, stand for hydrolysis for 10 hours, add graphene oxide and stir ultrasonically for 30 minutes; Wash with ethanol and ultrasonically clean with deionized water twice, then use a centrifuge to carry out layering, select the chromium powder with a smaller particle size and uniform distribution in the upper layer to pass through a 1000-mesh sieve, pour the sieved chromium powder into 16.0g / L acetic acid, The pickling time is pickling in the pickling solution for 5s, and the deionized water is washed again after pickling; the silane coupling agen...

Embodiment 2

[0031]The mass fraction in the composite material is: 20% chromium powder, 80% copper powder, chromium powder purity 99.9%, particle size 1000 mesh; copper powder purity 99.9%, particle size 200 mesh; graphene oxide layers 1-3 layers , the particle size is 15 microns, and the added amount is 0.0013% of the mass fraction of chromium powder. Prepare KH-550 silane coupling agent graphene oxide solution: alcohol-water ratio 1:10, KH-550 content is 0.2% by volume, stand for hydrolysis for 4 hours, add graphene oxide and stir ultrasonically for 30 minutes; chromium powder is first used without Wash with water ethanol and ultrasonically clean with deionized water twice, then use a centrifuge to carry out layering, select the upper layer of chromium powder with a smaller particle size and uniform distribution, pass through a 1000-mesh sieve, pour the sieved chromium powder into 6.0g / L pickling Pickling in the solution, the pickling time is 20s, after pickling, the deionized water is w...

Embodiment 3

[0033] The mass fraction in the composite material is: 10% of chromium powder, 10% of copper powder, 1-5 layers of graphene oxide, and 0.002% of the mass fraction of chromium powder with a particle size of 5 microns. The purity of chromium powder is 99.9%, and the particle size is 1000 mesh; the purity of copper powder is 99.9%, and the particle size is 200 mesh; preparation of KH-550 silane coupling agent graphene oxide solution: alcohol-water ratio 5:15, KH-550 content is volume fraction 0.8%, stand for hydrolysis for 6 hours, add graphene oxide and ultrasonically stir for 40 minutes; chromium powder is washed with absolute ethanol and deionized water ultrasonically for two times, and then layered with a centrifuge to select the upper layer with a smaller particle size and uniform distribution The chromium powder is passed through a 1000-mesh sieve, and the sieved chromium powder is poured into 10.0g / L pickling solution for pickling, and the pickling time is 10s in the pickli...

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Abstract

The invention discloses a refinement method of the second phase chromium in chromium-copper refractory alloys. Firstly, a chemical synthesis method is used to prepare chromium@graphene core-shell structure; chromium powder@graphene core-shell structure powder is prepared with copper powder Powder mixing and cold pressing; under the protection of inert gas, the chromium-copper composite material was prepared by arc melting. Through the construction of the nano-core-shell structure, this patent focuses on solving the bottleneck problems that limit the application such as the refinement and dispersion of chromium. Through the rapid solidification process in the vacuum arc melting process, the size of chromium is further refined, the controllable preparation of the second phase of chromium is realized, and the core problem in the preparation technology of high chromium copper alloy is solved. Develop high-strength, high-conductivity, high-life dispersion-strengthened copper alloys. Compared with the traditional preparation method, the second-phase chromium grains are refined by more than 50%, the hardness of the composite material is increased by more than 10%, and the electrical conductivity is increased by 10‑30%. A chrome-copper contact alloy with excellent comprehensive properties such as arc corrosion resistance and long life is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of refractory alloy materials, and in particular relates to a method for refining second phase chromium in chrome-copper refractory alloys. Background technique [0002] Copper-chromium alloy has superior mechanical and electrical properties. High-chromium copper alloy is the preferred material for medium and high voltage electrical equipment, especially in electrical contacts and contact wires. The good electrical contact performance of copper-chromium alloy mainly depends on the coordination of the two components. The copper component maintains a low melting point, high electrical conductivity and thermal conductivity to ensure the breaking capacity of the switch; the other component maintains a high melting point and high High strength and low cut-off value, improve the compressive strength, anti-ablation and anti-welding performance of the switch material. To realize the comprehensive superior perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00B22F3/04B22F9/04C22C1/02C22C9/00C22C27/06C01B32/184
CPCB22F3/04B22F9/04C22C1/02C22C9/00C22C27/06C01B32/184B22F2009/043B22F1/07B22F1/14B22F1/054B22F1/16
Inventor 冷金凤夏昌鹏王建荣董云帆
Owner 广州东铝轻合金有限公司
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