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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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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 metal, and insufficient opening of graphene sheets. Problem, the present invention uses low-cost graphite microflakes as raw materials, and provides a method for preparing graphene-reinforced aluminum matrix composites using graphite microflakes as raw materials

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

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specific Embodiment approach 1

[0037]Specific embodiment one: present embodiment is a kind of method that prepares graphene reinforced aluminum-based composite material with graphite microchip as raw material, and this method is carried out according to the following steps:

[0038] 1. Weighing

[0039] Take by weighing 0.5%~4% graphite flakes and 96%~99.5% aluminum metal powder by mass fraction, weigh industrial pure aluminum block, the weight ratio of industrial pure aluminum block and above-mentioned aluminum metal powder is (5~ 30): 1;

[0040] 2. Dispersion of graphite micro flakes and forming of prefabricated blocks

[0041] Put the graphite flakes and aluminum metal powder weighed in step 1 into a ball mill jar, ball mill the obtained mixed powder at a speed of 100-400rpm for 4-15 hours, and put the mixed powder obtained after ball milling into a cold-pressing mold for cold pressing Obtain graphite microchip prefabricated body; the specific steps of cold pressing are: pressurize the mixed powder to...

specific Embodiment approach 2

[0054] Embodiment 2: This embodiment differs from Embodiment 1 in that: the average diameter of the graphite microflakes in step 1 is 100 nm-10 μm, and the average thickness is 50-500 nm. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0055] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the average particle size of the aluminum metal powder in Step 1 is 1-30 μm. Other steps and parameters are the same as those in Embodiment 1 or 2.

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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,...

Claims

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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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