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A kind of preparation method of in-situ self-generated graphene reinforced magnesium matrix composite material

A composite material, an in-situ self-generating technology, applied in the field of nanocomposite materials, can solve the problem of poor performance of graphene-reinforced magnesium-based composite materials, poor wettability of graphene and magnesium alloys, and inability to fully exert the enhanced effect of graphene. problem, to achieve the effect of avoiding graphene segregation and high stiffness

Active Publication Date: 2020-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of problem that can solve because the wettability of graphene and magnesium alloy is not good, makes the strengthening effect of graphene in composite material can not be brought into full play, causes the performance of graphene reinforced magnesium-based composite material to be poor, To provide a method for preparing high-strength and high-ductility magnesium-based composite materials that is simple in process, low in cost and feasible

Method used

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  • A kind of preparation method of in-situ self-generated graphene reinforced magnesium matrix composite material
  • A kind of preparation method of in-situ self-generated graphene reinforced magnesium matrix composite material
  • A kind of preparation method of in-situ self-generated graphene reinforced magnesium matrix composite material

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of a kind of in-situ self-generated graphene reinforced magnesium-based composite material of the present embodiment, it is to carry out according to the following steps:

[0019] 1. Melting the base alloy in a crucible;

[0020] 2. Continuously feed the gas with a flow rate of 0.5L / min-5L / min into the semi-solid matrix alloy melt for 5min-40min, and keep mechanical stirring at a temperature of 580°C-700°C, and the stirring speed is 500r / min-3000r / min, stirring time is 10-20min;

[0021] 3. After the alloy is adjusted to a semi-solid interval temperature of 580-620°C, use the semi-solid stirring method to continue stirring for 10min-30min;

[0022] 4. Introduce high-energy ultrasonic waves into the alloy melt to promote the dispersion of graphene;

[0023] 5. The alloy melt is water-cooled and solidified to prepare composite materials;

[0024] 6. Hot-extrude the prepared composite material after solution treatment to ...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the ultrasonic power of the high-energy ultrasonic wave is 400-800w, the frequency is 20Hz, and the time for passing high-energy ultrasonic wave into the alloy melt for ultrasonic is 5- 60min. Others are the same as in the first embodiment.

[0026] The ultrasonic time in this embodiment may be 5-15 minutes.

specific Embodiment approach 3

[0027] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the ultrasonic rod is inserted into a place 25-35 mm below the liquid level of the alloy melt to promote the dispersion of graphene. It is the same as the first embodiment.

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Abstract

A method for preparing an in-situ self-generated graphene-reinforced magnesium-based composite material, which relates to the preparation of nanocomposite materials. The invention aims to solve the problem that the reinforcing effect of the graphene in the composite material cannot be fully exerted due to poor wettability of the graphene and the magnesium alloy, resulting in poor performance of the graphene-reinforced magnesium-based composite material. In the present invention, after the matrix alloy is first melted in the crucible, a certain flow rate of CO 2 The gas is passed into the semi-solid magnesium alloy melt for a period of time. And keep the mechanical stirring, and then use the semi-solid stirring method to realize the macroscopically uniform dispersion of the graphene in the alloy melt. Subsequently, high-energy ultrasonic waves are passed into the alloy melt to promote the dispersion of graphene. The alloy melt is cooled and solidified to prepare a composite material. Finally, the prepared composite material is subjected to solution treatment and then hot extruded. Extruded composite materials were prepared. The invention is applied in the field of nano material synthesis.

Description

technical field [0001] The invention relates to the preparation of an in-situ self-generated graphene-reinforced magnesium-based composite material, which belongs to the technical field of nanocomposite materials. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, which is a two-dimensional material with a thickness of only one carbon atom. Among known materials, graphene has the highest tensile strength (130 GPa) and stiffness (0.5-1TPa); magnesium is the lightest metal structure material with high specific strength and specific stiffness. At the same time, carbon materials such as graphene and magnesium alloys do not undergo chemical reactions at high temperatures, and magnesium alloys and graphene can be composited to prepare lightweight and high-strength magnesium-based composite materials. Therefore it can be an ideal reinforcement material for magnesium-based composites. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C23/00C22F1/06
CPCC22C1/1036C22C23/00C22F1/06C22C1/1063
Inventor 王晓军李雪健冷雪松胡小石吴昆
Owner HARBIN INST OF TECH