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High-thermal-conductivity aluminum-based graphene composite material and preparation method thereof

A composite material and graphene technology, applied in the field of composite materials, can solve the problems of difficult control of interface reaction, low density, uneven distribution of graphene, etc., and achieve mechanical strength improvement, mechanical strength improvement, wettability and bonding strength Effect

Inactive Publication Date: 2020-04-10
江苏新奥碳纳米材料应用技术研究院有限公司 +1
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Problems solved by technology

[0007] The present invention aims to solve the problem of uneven distribution of graphene, low density, difficult control of interface reaction and easy formation of Al in the above-mentioned existing aluminum-based graphene composite materials. 4 C 3 Defects such as brittle substances can significantly improve the thermal conductivity of aluminum matrix composites, and have the advantages of excellent mechanical properties, environmental protection and energy saving processes, and industrialized mass production. Provide a high thermal conductivity aluminum matrix graphene composite material

Method used

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preparation example Construction

[0037] A method for preparing a high thermal conductivity aluminum-based graphene composite material, the preparation method specifically includes the following steps:

[0038] The first step is to add graphene into the solvent and mix evenly in the dispersion device to obtain a uniform and stable graphene dispersion;

[0039] In the second step, the graphene dispersion liquid, aluminum powder and low-melting point alloy powder are uniformly mixed in proportion to form a slurry, and after drying, aluminum / graphene composite powder with uniform dispersion of graphene is obtained;

[0040] The third step is to put the composite powder into a cemented carbide mold and press it into a rod-shaped blank, and sinter it in a protective atmosphere to obtain a sintered dense rod;

[0041] In the fourth step, the sintered dense rod is subjected to hot extrusion molding to obtain an aluminum / graphene composite material.

Embodiment 1

[0042] Embodiment one: 30g graphene is added into 1 liter of deionized water, sand mill 1h with the rotating speed of 1500r / min in sand mill, obtain graphene dispersion liquid; Get 0.1 part of graphene dispersion liquid (use graphene in dispersion liquid mass calculation), 99.9 parts of aluminum powder (the grade of aluminum powder is 1080A) is prepared into a porridge-like slurry, dispersed at a speed of 2000r / min for 1 hour with a high-speed disperser, and the composite powder is obtained after drying; the composite powder is put into the cemented carbide In the mold, under the pressure of 200MPa, it is pressed into a blank with a diameter of φ50mm, and then sintered at 640°C for 3h under a high-purity nitrogen (N2) atmosphere, with a heating rate of 5°C / min and a cooling rate of 10°C / min, to obtain a sintered dense rod; finally The sintered dense rod is extruded into a φ12.7mm rod under the conditions of extrusion temperature 480°C, extrusion speed 1.8m / min, and extrusion ra...

Embodiment 2

[0043] Embodiment 2: Basically adopt the method of Embodiment 1, the difference is that the number of parts of graphene is adjusted to 0.3 parts, the number of parts of aluminum powder is 99.7 parts (the grade of aluminum powder is 1080A), and the sintering temperature is adjusted to 650 ° C. The outlet temperature was 480°C.

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Abstract

The invention relates to the technical field of graphene composite materials, in particular to a high-thermal-conductivity aluminum-based graphene composite material and a preparation method thereof.The high-thermal-conductivity aluminum-based graphene composite material comprises graphene, alloy and aluminum powder, the thermal conductivity of the aluminum-based composite material can be remarkably improved, and the high-thermal-conductivity aluminum-based graphene composite material has the advantages that the mechanical performance is excellent, the process is environmental-friendly and saves energy, and the industrial mass production can be achieved.

Description

technical field [0001] The invention relates to a composite material, in particular to a high thermal conductivity aluminum-based graphene composite material and a preparation method thereof. Background technique [0002] With the development of energy, electronics, and information industries, electronic components are becoming smaller and more powerful, which poses new challenges to the thermal conductivity of electronic packaging materials. Graphene has ultra-high mechanical strength, electron mobility and thermal conductivity, and has broad application prospects in the field of high-performance composite materials. Aluminum is abundant in nature, cheap and easy to get, and aluminum alloy has high mechanical properties, second only to silver and copper in electrical conductivity, etc., and is widely used in structural materials, wires, heat sinks, electronic packaging materials, etc. field. At present, studies have found that graphene plays a significant role in enhancin...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C21/00C22C32/00
CPCC22C1/05C22C21/00C22C32/0084
Inventor 胡智峰唐公民李达易伟刘耘成刘婷婷徐玮彤徐欢曲波李金来
Owner 江苏新奥碳纳米材料应用技术研究院有限公司
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