A kind of graphene-reinforced magnesium-based composite material and preparation method thereof

A composite material, graphene technology, applied in metal extrusion control equipment, manufacturing tools, metal processing equipment and other directions, can solve problems such as poor interface bonding, easy to produce agglomeration, and difficulty in obtaining high volume fraction of graphene, and achieve improved Content, high strength, the effect of ensuring the safety of the experiment

Active Publication Date: 2022-01-28
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to solve the technical problems in the prior art that graphene is easy to agglomerate in the magnesium matrix, the content of graphene in the magnesium matrix is ​​difficult to obtain a high volume fraction, and the interface is poorly bonded, the invention provides a graphene-enhanced magnesium matrix Composite material and its preparation method

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  • A kind of graphene-reinforced magnesium-based composite material and preparation method thereof
  • A kind of graphene-reinforced magnesium-based composite material and preparation method thereof
  • A kind of graphene-reinforced magnesium-based composite material and preparation method thereof

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preparation example Construction

[0031]The present invention provides a kind of preparation method of graphene-reinforced magnesium-based composite material in the first aspect, described method comprises the steps:

[0032] (1) The magnesium matrix is ​​heated and melted in a crucible to obtain a magnesium matrix melt; air or a mixed gas formed by mixing oxygen and a rare gas is introduced at the top of the crucible. In the present invention, for example, an aerator is used to A certain flow of air or a mixed gas formed by mixing oxygen and rare gas (such as argon) is introduced into the top of the crucible, so that the top of the crucible is in direct contact with the flowing air or the flowing mixed gas, so The volume percentage of oxygen in the mixed gas is 10% to 30% (such as 10%, 15%, 20%, 25% or 30%). The mixed gas is, for example, mixed with oxygen and argon, and oxygen and argon The volume ratio of gas is 1:4; the magnesium matrix is ​​one or more of magnesium-zinc alloy, magnesium-calcium alloy, mag...

Embodiment 1

[0056] The preparation method of the graphene-reinforced magnesium-based composite material of the present embodiment is as follows:

[0057] 1. Heat and melt 700g of Mg-6Zn alloy (magnesium matrix) in a crucible at 720°C to obtain a magnesium matrix melt; wherein, the melted volume of the magnesium matrix accounts for 3 / 5 of the volume of the crucible, and air is introduced at the top of the crucible , so that the top of the crucible is in direct contact with the flowing air;

[0058] 2. Adjust the temperature of the magnesium matrix melt to 680°C, and continuously inject CO gas into the magnesium matrix melt at a flow rate of 2L / min for 40 minutes to carry out gas-liquid in-situ reaction, accompanied by mechanical stirring, and the stirring speed is 600r / min. min, to obtain a graphene-reinforced alloy melt with a graphene content ratio of 0.6wt.%. While the gas-liquid in-situ reaction occurs between the CO gas and the magnesium matrix melt, the temperature at the top of the ...

Embodiment 2

[0064] The preparation method of the graphene-reinforced magnesium-based composite material of the present embodiment is as follows:

[0065] 1. Heat and melt 700g Mg-4Zn-0.5Ca alloy in a crucible at 720°C to obtain a magnesium matrix melt; wherein, the melted volume of the magnesium matrix accounts for 1 / 2 of the volume of the crucible, and air is introduced at the top of the crucible, Keep the top of the crucible in direct contact with the flowing air;

[0066] 2. Adjust the temperature of the magnesium matrix melt to 680°C, and continuously inject CO gas into the magnesium matrix melt at a flow rate of 2L / min for 40 minutes to carry out gas-liquid in-situ reaction, accompanied by mechanical stirring, and the stirring speed is 600r / min. min, to obtain a graphene-reinforced alloy melt with a graphene content ratio of 0.6wt.%. While the gas-liquid in-situ reaction occurs between the CO gas and the magnesium matrix melt, the temperature at the top of the crucible is guaranteed ...

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Abstract

The invention relates to a graphene-reinforced magnesium-based composite material and a preparation method thereof. The method is as follows: heating and melting the magnesium matrix in a crucible to obtain a magnesium matrix melt; introducing air or a mixed gas formed by mixing oxygen and rare gas at the top of the crucible; the magnesium matrix is ​​magnesium-zinc alloy, magnesium-calcium alloy, magnesium One or more of copper alloys and magnesium-zinc-calcium alloys; CO is continuously introduced into the magnesium matrix melt for gas-liquid in-situ reaction to obtain a graphene-enhanced alloy melt; when CO reacts with the magnesium matrix melt At the same time, ensure that the temperature of the top of the crucible is above 300° C., and ignite the escaped CO on the top of the crucible; solidify the graphene-reinforced alloy melt to obtain a graphene-reinforced magnesium-based composite material. The invention has the advantages of low cost and feasibility, simple operation and high operation safety factor. The invention obtains a graphene-reinforced magnesium-based composite material with low content of magnesium oxide, high dispersion of graphene with high volume fraction, high interface bonding strength and excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of preparing magnesium-based composite materials, in particular to a graphene-reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] Magnesium is the lightest metal structural material, its density is 35% lighter than aluminum and 65% lighter than titanium. However, the shortcomings of magnesium alloys such as low stiffness, low strength, and high thermal expansion coefficient greatly limit its application range. Magnesium-based composites overcome or significantly alleviate the above-mentioned shortcomings of magnesium alloys by adding appropriate reinforcements to the matrix magnesium alloy, and have low density, high specific strength, high specific stiffness, good high temperature resistance, and good damping performance And electromagnetic shielding, lightweight effect is very significant, it is one of the ideal materials in cutting-edge fields suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/03C22C23/04C22F1/06B21C31/00
CPCC22C1/1036C22C23/04C22F1/06B21C31/00
Inventor 王晓军李雪健曹金华胡小石徐超
Owner HARBIN INST OF TECH
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