Method for preparing graphene reinforced aluminum matrix composite by using graphite micro pieces as raw materials

A technology of graphite microflakes and reinforced aluminum matrix, which is applied in the field of preparing aluminum matrix composite materials, can solve the problems of insufficient opening of graphene sheets, low ingot density, incomplete impregnation, etc., and achieves excellent flow properties and has Fluidity, high density effect

Active Publication Date: 2017-08-18
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of high cost of graphene-reinforced aluminum matrix composites, low density and incomplete impregnation of ingots of graphite microflakes reinforced aluminum matrix composites impregnated with aluminum me

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  • Method for preparing graphene reinforced aluminum matrix composite by using graphite micro pieces as raw materials

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Example Embodiment

[0037] Specific embodiment 1: This embodiment is a method for preparing a graphene-reinforced aluminum-based composite material using graphite microchips as a raw material, and the method is performed as follows:

[0038] 1. Weighing

[0039] Weigh 0.5% to 4% of graphite flakes and 96% to 99.5% of aluminum metal powder according to the mass fraction, and weigh the industrial pure aluminum block. The weight ratio of the industrial pure aluminum block to the above aluminum metal powder is (5~ 30): 1;

[0040] 2. Graphite microchip dispersion and prefabricated block molding

[0041] The graphite flakes and aluminum metal powder weighed in step 1 are put into a ball mill tank, the mixed powder obtained by ball milling at a speed of 100-400 rpm for 4-15 hours, and the mixed powder obtained after ball milling is put into a cold pressing mold for cold pressing Obtain a graphite microchip preform; the specific steps of performing cold pressing are: pressurizing the mixed powder to 4-8 MPa at...

Example Embodiment

[0054] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the graphite microplates in step 1 have an average sheet diameter of 100 nm-10 μm and an average thickness of 50-500 nm. The other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0055] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the average particle size of the aluminum metal powder in step one is 1-30 μm. The other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing an aluminum matrix composite, in particular to a method for preparing a graphene reinforced aluminum matrix composite by using graphite micro pieces as raw materials to solve the problems that current graphene reinforced aluminum matrix composites are high in cost, composite castings are poor in performance, and opening of graphene piece layers is insufficient. The preparation method comprises the steps of weighing, graphite micro piece dispersion and precast block forming, aluminum metal vacuum permeation, large plastic deformation treatment and component homogenization treatment. According to the method, the low-cost graphite micro pieces are used as the raw materials, a graphite micro piece reinforced aluminum matrix composite is firstly prepared, and the prepared few-layer graphene reinforced aluminum matrix composite is excellent in comprehensive performance, over 90 GPa in elastic modulus, over 400 MPa in tensible strength and over 230 W/(m.K) in heat conductivity. The method is applicable to preparing the graphene reinforced aluminum matrix composite.

Description

technical field [0001] The invention relates to a method for preparing aluminum-based composite materials Background technique [0002] Graphene has a tensile strength as high as 125GPa, an elastic modulus of 1TPa, and a thermal conductivity of 5000W / (m K), which is undoubtedly a nearly ideal reinforcement with superior comprehensive performance. According to the number of layers, graphene can be divided into single-layer graphene, double-layer graphene, few-layer graphene (3-10 layers) and multi-layer graphene (the number of layers is more than 10 layers, and the total thickness is less than 10nm). At present, the research on using graphene to improve the performance of resins and ceramics is the most active, while the research on using graphene to strengthen metal matrix, especially aluminum matrix composites is relatively less. The preparation methods are mainly solid-phase method and liquid-phase method. The solid-phase method includes various powder metallurgy methods,...

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Application Information

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IPC IPC(8): C22C1/10C22C21/00C22F1/04
CPCC22C1/1015C22C1/1036C22C21/00C22F1/04C22C1/1073
Inventor 武高辉杨文澍张强修子扬姜龙涛陈国钦乔菁康鹏超芶华松
Owner HARBIN INST OF TECH
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