Preparation method of high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material

A technology of aluminum alloy materials and graphene, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of decreased dispersion effect and achieve the effects of improved tensile strength, adjustable process and simple operation

Inactive Publication Date: 2018-08-14
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, electrostatic self-assembly is only suitable for use when the powder mass is small. For a large mass of metal powder mixed with graphene, the dispersion effect is greatly reduced

Method used

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  • Preparation method of high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material
  • Preparation method of high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material
  • Preparation method of high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material

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preparation example Construction

[0041] A kind of preparation method of graphene reinforced aluminum alloy material, comprises the steps:

[0042] 1) graphene is physically dispersed in an organic solvent to obtain a graphene dispersion;

[0043] 2) modifying the aluminum alloy powder with an organic hydrophilic modifier, and then removing the free organic hydrophilic modifier to obtain a surface-modified aluminum alloy powder;

[0044] 3) adding an appropriate amount of organic solvent to the surface-modified aluminum alloy powder and then slowly adding the graphene dispersion, wet mixing evenly, and drying to obtain graphene-coated aluminum alloy powder;

[0045] 4) keeping the graphene-coated aluminum alloy powder in a solid state, isolating oxygen, removing the organic hydrophilic modifier by pyrolysis, and obtaining the graphene / aluminum alloy mixed powder;

[0046] 5) packing the graphene / aluminum alloy mixed powder into a can and compacting it;

[0047] 6) The powder is mixed in the heating tank unti...

Embodiment 1

[0076] 1) Take 299.1 g of 8030 brand aluminum alloy atomized powder (nitrogen atomized, purity ≥ 99.5%, particle size 20-50 μm) for commercial low-voltage construction; scientific research grade graphene (Simen Kaina Graphene Technology Co., Ltd. ~3 layers, sheet diameter 5~20μm, diameter-thickness ratio﹥1000)0.9g;

[0077] 2) Aluminum alloy powder pretreatment: Add 8030 aluminum alloy atomized powder to 3wt% polyvinyl alcohol (PVA) aqueous solution, ultrasonically + mechanically stir for 30 minutes, filter, and wash with deionized water to obtain PVA-modified 8030 aluminum alloy powder;

[0078] 3) Graphene pretreatment: Graphene is placed in 300ml of absolute ethanol and dispersed by ultrasonic+mechanical stirring for 2h, and the amount of graphene added is 0.3wt% of the prepared graphene / 8030 aluminum alloy composite material;

[0079] 4) No-sphere wet mixing of graphene and PVA-modified aluminum alloy powder: Add appropriate amount of anhydrous alcohol to the PVA-modified ...

Embodiment 2

[0088] Same as Example 1, the difference is that the addition of graphene is adjusted to 0.5wt%, and the semi-solid extrusion temperature is adjusted to 650°C (calculated by the phase diagram, the liquid phase ratio is 18.5wt%).

[0089] The room temperature tensile strength of the prepared 0.5wt% graphene / 8030 aluminum alloy composite rod is 216.5MPa, the elongation is 17.9%, and the steady-state creep rate is 3.1×10 -8 mm·s -1 , and the conductivity (IACS) was 61.9%. 8030 aluminum alloy matrix bar without adding graphene prepared by the same process (tensile strength 175.4MPa, elongation 18.2%, steady-state creep rate 7.8×10 -8 mm·s -1 , IACS 62.5%), elongation and electrical conductivity are also equivalent, tensile strength increased by 23.4%, steady-state creep rate decreased by 60.3%, strength and creep resistance are improved.

[0090] Yu Guoliang, Wu Zhenjiang and others from Shanghai Xinyi Power Line Equipment Co., Ltd. published the mechanical properties of indust...

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Abstract

The invention discloses a preparation method of a high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material. Aluminium powder is modified to improve the affinity of the aluminium powder to graphene, and after that, semi-solid extrusion is performed to obtain the graphene enhanced aluminium alloy material. The preparation method is simple to operate, adjustable in process and controllable in graphene content; graphene is uniformly dispersed in the aluminium alloy material; the demand on an aluminium matrix is less; the high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material can be compounded with various aluminium alloys to obtain corresponding graphene enhanced aluminium alloy materials; meanwhile, the integrity of graphene can be maintained to the utmost extent, and the binding force between the high-strength high-conductivity creep-resistant graphene enhanced aluminium alloy material and the matrix is improved. A prepared graphene / aluminium alloy-based composite has the compactness of 98.5% or above, has the conductivity equivalent to that of a matrix aluminium alloy rod piece (more than 61% IACS), and is improved by more than 20% in tensile strength and more than 50% in creep resistance. The preparation method is suitable for preparing the long graphene enhanced aluminium alloy material, and is low in production cost, suitable for industrial production and favorable in market prospect.

Description

technical field [0001] The invention relates to a method for preparing an aluminum alloy, in particular to a method for preparing a high-strength and high-conductivity creep-resistant graphene-reinforced aluminum alloy material. Background technique [0002] With the development of today's electric power science and technology, it has become an inevitable development trend to use aluminum, which is richer in resources and cheaper in cost, to replace copper as the core material of wires and cables. However, due to its poor mechanical properties, pure aluminum wires are prone to breakage during service, and the oxidation of wire joints causes overload heating and creep failures, resulting in open circuits and other phenomena. Therefore, it is necessary to strengthen the research intensity and depth of aluminum alloy wires, improve the comprehensive performance of aluminum alloy wires, especially under the premise that the conductivity of aluminum alloy wires is equivalent, imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/04C22C21/00B22F1/00B22F1/02B22F3/02B22F3/20
CPCC22C1/0416C22C1/101C22C21/00B22F3/02B22F3/20B22F2998/10B22F1/145B22F1/16
Inventor 易丹青郭宇明王斌刘会群王南海江勇许晓嫦
Owner CENT SOUTH UNIV
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