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Method for reinforcing magnesium matrix composite by using magnesium oxide-coated graphene

A composite material, magnesium oxide technology, applied in the field of preparation of magnesium-based composite materials, can solve the problems of poor wettability with magnesium alloys, low surface activity of graphene, etc., to achieve excellent performance, obvious grain refinement effect, and low process cost low effect

Active Publication Date: 2015-09-09
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to carbon nanotubes, the preparation of high-performance graphene-magnesium-based composites also needs to solve the following three problems: First, how to adopt appropriate methods to uniformly disperse graphene into the matrix and combine it with the matrix with a good interface ; The second is how to solve the problem of low surface activity of graphene and poor wettability with magnesium alloys; the third is how to keep graphene in a complete structure during high temperature sintering

Method used

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  • Method for reinforcing magnesium matrix composite by using magnesium oxide-coated graphene
  • Method for reinforcing magnesium matrix composite by using magnesium oxide-coated graphene
  • Method for reinforcing magnesium matrix composite by using magnesium oxide-coated graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0020] First, mix 0.3g of graphene coated with magnesia and 300ml of ethanol solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed mixed solution of coated magnesia and graphene; then add 99.7g of AZ91 magnesium alloy powder with a particle size of 325 mesh Ultrasonic and mechanical stirring in the mixed liquid for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 200 MPa; the cold-pressed composite material was protected by argon environment, sintering at 600°C for 2 hours; the sintered composite material was hot-extruded at 400°C to obtain the AZ91 / 0.3wt.%MgO-GN composite material; finally, the extruded composite material was subjected to T6 heat treatment. The mechanical properties of the AZ91 / 0.3wt.%MgO-GN composite after heat treatment were tested, and its tensile strength was 270-290MPa, elongation was 8.2...

Embodiment 2

[0022] First, mix 0.5g of graphene coated with magnesia and 400ml of ethanol solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed mixed solution of coated magnesia and graphene; then add 99.5g of AZ91 magnesium alloy powder with a particle size of 325 mesh Ultrasonic and mechanical stirring in the mixed liquid for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 200 MPa; the cold-pressed composite material was protected by argon environment, sintering at a high temperature of 550°C for 2h; the sintered composite material was hot-extruded at a temperature of 400°C to obtain an AZ91 / 0.5wt.%MgO-GN composite material; finally, the extruded composite material was subjected to T6 heat treatment. After heat treatment. The mechanical properties of the AZ91 / 0.5wt.%MgO-GN composite were tested. Its tensile strength is ...

Embodiment 3

[0024] First, mix 1.0g of graphene coated with magnesia and 500ml of ethanol solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed mixed solution of coated magnesia and graphene; then add 99g of AZ91 magnesium alloy powder with a particle size of 325 mesh Ultrasonic and mechanical stirring in the mixed liquid for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 200 MPa; the cold-pressed composite material was protected by argon environment, sintering at a high temperature of 550°C for 2h; the sintered composite material was hot-extruded at a temperature of 400°C to obtain an AZ91 / 0.5wt.%MgO-GN composite material; finally, the extruded composite material was subjected to T6 heat treatment. The mechanical properties of the heat-treated AZ91 / 0.5wt.%MgO-GN composite were tested, and its tensile strength was 310-350...

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Abstract

The invention provides a method for reinforcing a magnesium matrix composite by using magnesium oxide-coated graphene. The method comprises the following steps: mixing 0.1 to 5 g of magnesium oxide-coated graphene with no less than 250 ml of an ethanol solution and carrying out ultrasonic treatment for 1 to 2 h so as to obtain a magnesium oxide-coated graphene ethanol mixed liquor; adding magnesium alloy powder with mass of no less than 95 g and granularity of no more than 325 meshes into the mixed liquor and carrying out ultrasonic treatment and mechanical stirring for 1 to 3 h so as to obtain mixed slurry; carrying out filtering and vacuum drying on the mixed slurry, then transferring the obtained substance to a die and carrying out cold pressing at room temperature under a pressure of 100 to 600 MPa; sintering a cold-pressed composite at 500 to 600 DEG C under the protection of argon for 2 to 4 h; carrying out hot extrusion on the sintered composite at 350 to 400 DEG C; and subjecting the extruded composite to T6 heat treatment. The method has the advantages of low process cost, safety, reliability and simple operation; the magnesium oxide-coated graphene is uniformly distributed in magnesium alloy and has high bonding strength with a matrix interface, obvious grain refinement effect is obtained, and the composite has excellent performance; and the method can realize industrial preparation of the high-performance graphene-reinforced magnesium alloy composite.

Description

technical field [0001] The invention belongs to the field of metal material preparation, in particular to a preparation method of a magnesium-based composite material. Background technique [0002] In recent years, with the rapid development of high-tech fields such as aerospace, machinery, automobile and electronics industries, the demand for magnesium-based composite materials has increased sharply. Magnesium-based composites have the advantages of high specific strength, high specific stiffness, high wear resistance, high vibration damping, etc., and have received unprecedented attention. Since graphene (GN) was successfully stripped from graphite by Andre Geim and Konstantin Novoselov in 2004, due to its superior physical and chemical properties, it has attracted material researchers. their broad interests. At present, graphene is introduced into the magnesium alloy matrix as a reinforcing phase, and it is still in the initial stage to try to obtain high-performance ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C23/00
Inventor 袁秋红曾效舒刘勇
Owner NANCHANG UNIV
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