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A kind of magnesium alloy graphene modifier and its preparation method and application

A magnesium alloy and graphene technology, which is applied in the field of magnesium alloy graphene modifier and its preparation, can solve the problems of poor refinement effect and weakening effect of graphene modifier, achieve high refinement efficiency and improve grain refinement Efficiency, casting performance improved significantly

Active Publication Date: 2022-01-28
HARBIN INST OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The master alloy refining agent containing graphene modifier previously studied by our team can form new nucleation particles through the reaction of graphene and Al elements in Mg-Al magnesium alloys. In the magnesium alloys of this system, there are Significant refinement effect, successfully solved the bottleneck that there is no suitable refiner in Mg-Al series magnesium alloy, but after in-depth research, it is found that this refiner has a good effect on Mg-Zn series magnesium alloy containing Zn The refinement effect is not even as good as that of the Zr refiner (Zr has an effect on magnesium alloys that do not contain aluminum); in addition, in the preparation process, there is also a weakening of the graphene modifier due to the generation of high content of magnesium oxide. problem of effect

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  • A kind of magnesium alloy graphene modifier and its preparation method and application
  • A kind of magnesium alloy graphene modifier and its preparation method and application
  • A kind of magnesium alloy graphene modifier and its preparation method and application

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preparation example Construction

[0032] The present invention provides a kind of preparation method of magnesium alloy graphene modifier in the first aspect, described method comprises the steps:

[0033] (1) Magnesium (pure magnesium) is heated and melted in a crucible to obtain a magnesium 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, aeration is used to The device introduces a certain flow of air or a mixed gas formed by mixing oxygen and rare gas (such as argon) 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, The volume percentage of oxygen in the mixed gas is 10-25% (such as 10%, 15%, 20% or 25%).

[0034] (2) Continuously feed carbon monoxide (CO) gas into the magnesium melt to carry out magnesia thermal reaction to obtain a composite melt, and the mass percentage of graphene generated in the composite melt is 0.1 to 10% (for...

Embodiment 1

[0056] The preparation method of the magnesium alloy graphene modifier of the present embodiment is as follows:

[0057] 1. Heat and melt 632g of pure magnesium in a crucible at 700°C to obtain a magnesium melt; wherein, the volume of the melted magnesium accounts for 1 / 3 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 contact with the flowing direct contact with air;

[0058] Two, the CO gas with the purity (volume percentage) of 1L / min being 99.9% is continuously fed into the magnesium melt, and the temperature is maintained at 700° C. under the condition of mechanical stirring for 70 min to obtain the magnesium thermal reaction. Composite melt, the graphene that finally generates accounts for 1.5wt.% of composite melt total mass; Wherein, stirring speed is 1500r / min; While CO gas and magnesium melt take place magnesia thermal reaction, ensure that the temperature of crucible top is at Above 300°C, the CO...

Embodiment 2

[0062] The preparation method of the fine-grained magnesium alloy of the present embodiment is as follows:

[0063] 1. Heat and melt 632g of pure magnesium in a crucible at 700°C to obtain a magnesium melt; wherein, the volume of the melted magnesium accounts for 1 / 3 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 contact with the flowing direct contact with air;

[0064] Two, the CO gas with the purity (volume percentage) of 1L / min being 99.9% is continuously fed into the magnesium melt, and the temperature is maintained at 700° C. under the condition of mechanical stirring for 70 min to obtain the magnesium thermal reaction. Composite melt, the graphene that finally generates accounts for 1.5wt.% of composite melt total mass; Wherein, stirring speed is 1500r / min; While CO gas and magnesium melt take place magnesia thermal reaction, ensure that the temperature of crucible top is at Above 300°C, the CO gas ...

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Abstract

The invention relates to a magnesium alloy graphene modifier and a preparation method and application thereof. The method is as follows: heating and melting magnesium in a crucible to obtain a magnesium melt; introducing air or a mixed gas formed by mixing oxygen and rare gas at the top of the crucible, and the volume content of oxygen in the mixed gas is 10-25%; Continuously feed CO into the magnesium melt for magnesia thermal reaction until the mass percentage of graphene generated in the magnesium melt is 0.1-10%, and a composite melt is obtained; a magnesia thermal reaction occurs between CO and the magnesium melt At the same time, make the temperature of the top of the crucible more than 300°C, and ignite the escaped CO that did not participate in the reaction at the top of the crucible; let the composite melt stand still, and then make it solidify to obtain a magnesium alloy graphene modifier. The invention effectively controls the content of magnesium oxide in the reaction product, can not only realize the grain refinement of the matrix magnesium, but also change the morphology of the eutectic structure, so that the casting can obtain ideal mechanical properties.

Description

technical field [0001] The invention relates to the technical field of preparation of non-ferrous metal materials, in particular to a magnesium alloy graphene modifier and a preparation method and application thereof. Background technique [0002] Cast magnesium alloys are considered to have very wide application potential due to their low cost. The casting technology of magnesium alloys has been developed, but the disadvantages of poor plasticity and strength at room temperature limit its application. The study found that the smaller the grain size of the metal material, the higher the yield strength of the material. Therefore, grain refinement technology is an important means to improve cast magnesium alloys. At present, adding modifiers to the melt to promote heterogeneous nucleation is the most important means of refining cast magnesium alloys. As the most effective modifier, Zr has been successfully applied in the commercial production of non-Mg-Al alloys. However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C23/00
CPCC22C1/03C22C23/00
Inventor 王晓军李雪健曹金华徐超胡小石
Owner HARBIN INST OF TECH
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