Preparation method of in-situ reduced graphene reinforced magnesium-matrix composite

A technology of composite materials and graphene, which is applied in the field of preparation of magnesium-based composite materials, can solve the problems that the mechanical properties of composite materials do not reach the theoretical calculation value, the enhancement effect of graphene is not obvious, and the quality of interface bonding is poor, so as to achieve better reinforcement effect Good, low cost, and the effect of improving the interface bonding strength

Inactive Publication Date: 2015-05-20
NANCHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, similar to carbon nanotube nanocomposites, graphene also faces problems such as agglomeration, uneven mixing with the matrix, and poor interface bonding quality, making the reinforcement effect of graphene not obvious, and the mechanical properties of the composite are far from theoretical Calculated

Method used

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  • Preparation method of in-situ reduced graphene reinforced magnesium-matrix composite
  • Preparation method of in-situ reduced graphene reinforced magnesium-matrix composite
  • Preparation method of in-situ reduced graphene reinforced magnesium-matrix composite

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Experimental program
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Effect test

Embodiment 1

[0017] Firstly, add 0.3g of graphite oxide into 300ml of ethanol solution and dissolve it by ultrasonic for 30min to obtain a graphene oxide-ethanol mixture with a concentration of 1mg / ml; add 99.7g of AZ91 magnesium alloy powder with a particle size of 325 mesh into the above mixture, and then ultrasonically and mechanically stir After dispersing for 2 hours, a uniformly dispersed mixed slurry was obtained; the mixed slurry was vacuum-dried after suction filtration, and then transferred to a mold, and pressed at room temperature with a pressure of 100 MPa to form a composite material green body; Under protection, it was sintered for 2 h; then the sintered composite was hot-extruded at 350 °C to obtain the AZ91 / 0.3wt.% GO composite. The mechanical properties of the AZ91 / 0.1wt.% GO composite were tested. The tensile strength was 251-290MPa, the elongation was 6-8%, and the hardness was 80-90HV. It is a composite material with excellent mechanical properties.

Embodiment 2

[0019] First, add 0.5g of graphite oxide to 500ml of ethanol solution and dissolve it by ultrasonic for 30min to obtain a graphene oxide-ethanol mixture with a concentration of 1mg / ml; add 99.5g of AZ91 magnesium alloy powder with a particle size of 325 mesh into the above mixture, and then ultrasonically and mechanically stir After dispersing for 2 hours, a uniformly dispersed mixed slurry was obtained; the mixed slurry was vacuum-dried after suction filtration, and then transferred to a mold, and pressed at room temperature with a pressure of 100 MPa to form a composite material green body; Under protection, it was sintered for 2 h; then the sintered composite was hot-extruded at 350 °C to obtain the AZ91 / 0.5wt.% GO composite. The mechanical properties of the AZ91 / 0.5wt.% GO composite were tested. The tensile strength was 345.8-364MPa, the elongation was 8-10%, and the hardness was 85-95HV. It is a composite material with excellent mechanical properties.

[0020] attached f...

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Abstract

The invention discloses a preparation method of an in-situ reduced graphene reinforced magnesium-matrix composite. The method comprises the following steps: dissolving graphite oxide in an appropriate amount of ethanol solution, and performing ultrasonic treatment for 0.5-2h to obtain a graphene oxide ethanol solution with concentration of less than or equal to 2mg / ml; adding appropriate AZ91 magnesium alloy powder with the particle size of less than or equal to 325 meshes into the mixed solution, and performing ultrasonic treatment and mechanical stirring for 2h to obtain mixed slurry; performing vacuum drying of the mixed slurry, transferring into a mould, and pressing into a composite green under the pressure of 100-600MPa at room temperature; sintering the composite green for 2-4h at 500-600 DEG C in argon protection; and finally performing hot extrusion of the sintered composite at 350-400 DEG C. The preparation method disclosed by the invention is simple in preparation process and safe and reliable; the reduced graphene has good dispersity in magnesium alloy; and the reduction byproduct MgO is good for improving the interface bonding strength so that the reinforcing effect is better and the performance of the composite is excellent. Compared with the method of directly adding graphene into the magnesium matrix, the cost is lower and the dispersity is better; and the preparation method is suitable for industrial preparation of a 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] With the rapid development of aerospace, automobile, machinery, 3C and other high-tech fields, the demand for high-performance new magnesium-based composite materials continues to increase. Magnesium-based composites have a series of advantages such as high specific strength, specific stiffness, wear resistance, and vibration damping, and have received extensive attention. Graphene is a new type of carbon material with excellent performance and two-dimensional honeycomb lattice structure. It has excellent physical and chemical properties, and its strength can reach 1060GPa. How to use it to improve the strength of composite materials has become a current research hotspot. . However, similar to carbon nanotube nanocomposites, graphene also faces problems such as agglomeration, un...

Claims

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Application Information

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