Preparation method of graphene/aluminum alloy composite material

A composite material and aluminum alloy technology, applied in the field of composite material preparation, can solve problems such as deterioration of material properties, and achieve the effects of improving dispersion uniformity, low preparation cost, and adjustable and controllable process.

Inactive Publication Date: 2015-12-02
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

However, if graphene is directly added to molten aluminum without any treatment, serious defects (pores, graphene agglomeration, etc.) will be observed in the final ingot, deteriorating material properties.

Method used

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  • Preparation method of graphene/aluminum alloy composite material
  • Preparation method of graphene/aluminum alloy composite material

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Experimental program
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Effect test

Embodiment 1

[0040] Get 999 grams of commercial aluminum alloy atomized powder (nitrogen atomization, purity ≥ 99%), and 1 g of graphene (prepared by Hummer's method). The specific preparation process is as follows:

[0041] (1) The pure aluminum alloy atomized powder with a particle size of 30 μm and the added amount of graphene added is 0.1wt.% of the total amount of graphene / aluminum composite in a "V" type powder mixer with a speed of 10r / min Mix in medium for 24h;

[0042] (2) Put the mixed powder into a VC high-efficiency mixer with a rotating speed of 100r / min and mix for 10min;

[0043] (3) Put the mixed powder, high-carbon chromium bearing steel balls and stearic acid in a stirring ball mill at the same time, fill with liquid nitrogen, and start ball milling when all the balls are submerged in liquid nitrogen. The ball-to-material ratio is 30:1;

[0044] (4) After 2 hours of low-temperature ball milling, take out the powder and place it in an inert gas protection box. After the ...

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Abstract

The invention provides a preparation method of a graphene / aluminum alloy composite material. The addition quantity of graphene in the composite material accounts for 0.1wt.%-5.0wt.% of the total quantity of the composite material. Compared with tensile strength and electrical performance of an aluminum alloy without graphene, the mechanical properties and the electrical performance of the graphene / aluminum alloy composite material are improved to varied degrees. With the appearance of an intermediate alloy of the graphene / aluminum alloy composite material, the graphene can be added to molten aluminum in a form of a graphene / aluminum alloy intermediate alloy, and the dispersion uniformity of the graphene in the molten aluminum is improved to the greatest degree, so that industrial batch production of graphene modified aluminum conductor cables can be realized with a melt-casting method. The preparation method of the composite material comprises steps as follows: mechanical mixing, low-temperature ball milling, vacuum degassing, hot isostatic pressing and extrusion and the like, adopts simple and controllable technology, has lower production cost, is applicable to industrial production and has good market prospect.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a graphene / aluminum alloy composite material. Background technique [0002] Due to the large span suspended in the air, the overhead high-voltage transmission line not only has certain requirements for the conductivity of the conductor and cable, but also has certain requirements for the strength of the conductor and cable. At present, the commonly used overhead high-voltage transmission wires at home and abroad include copper wires and aluminum wires. Compared with aluminum wires, copper wires have better conductivity and higher strength. However, the cost of copper conductors is high, and copper is a strategic resource, while aluminum resources are abundant, widely distributed, and low in cost. Although almost 90% of the transmission lines in some places use aluminum composite conductors, the application of aluminum composite conductors i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00C22C21/02C22C21/08C22C1/03
Inventor 李炯利王旭东何维维戴圣龙王胜强
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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