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Preparation method for improving semi-solid structure of magnesium-based composite material

A composite material, semi-solid technology, applied in the field of metal material manufacturing, can solve the problems of large equipment investment, serious magnetic leakage, stirring dead zone, etc., and achieve the effects of uniform secondary phase distribution, safe and environmentally friendly operation, and stable process.

Active Publication Date: 2021-07-09
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the mechanical stirring method has the following disadvantages: the molten metal is easily polluted and corroded by the stirrer, and it is easy to be involved in gas and inclusions after a long time, and there is a stirring dead zone, which affects the quality of the semi-solid billet
The isothermal heat treatment method has the following disadvantages: the process parameters such as heating temperature and holding time are difficult to control
Among them, the electromagnetic stirring method has the following disadvantages: the investment in equipment is large, the electromagnetic gap of the device is large, the magnetic flux leakage is serious, and a large part of the energy cannot be used for stirring the metal melt, which greatly increases the production cost.
The near-liquidus method has the following disadvantages: the preparation cycle is long, and it is difficult to accurately control the pouring temperature of the melt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for improving the semi-solid structure of a magnesium-based composite material, comprising the following steps:

[0032] (1) Mix graphene nanosheets with a thickness of 4-20nm, a microchip size of 5-10μm, and a layer number of less than 20 with absolute ethanol in a beaker and mix them with 3g of graphene nanosheets per 100mL of ethanol, then put them into ultrasonic cleaning Perform ultrasonic dispersion treatment in the instrument for 130min, the ultrasonic power is 450W, and the frequency is 40kHz; the purity ≧ 99.5%, the particle size of 100-200 mesh magnesium powder and absolute ethanol are mixed into 47g magnesium powder per 150mL ethanol in the beaker and stirred mechanically Mixing, the stirring speed is 110r / min, and the time is 130min; then, pour the magnesium powder ethanol mixture evenly into the graphene nanosheet ethanol dispersion after the ultrasonic dispersion treatment and continue to maintain the same power, frequency ultrasonic di...

Embodiment 2

[0040] A preparation method for improving the semi-solid structure of a magnesium-based composite material, comprising the following steps:

[0041] (1) Graphene nanosheets with a thickness of 4-20nm, a microchip size of 5-10μm, and a layer number of less than 20 are mixed with absolute ethanol in a beaker and mixed with 2.5g of graphene nanosheets per 100mL of ethanol, and then placed in an ultrasonic Ultrasonic dispersion treatment was carried out in the cleaning instrument for 100min, the ultrasonic power was 400W, and the frequency was 35kHz; the purity ≥ 99.5%, the particle size of 100-200 mesh magnesium powder and absolute ethanol were mixed in a beaker with 47.5g of magnesium powder per 150mL of ethanol and passed through Mix by mechanical stirring, the stirring speed is 100r / min, and the time is 100min; Then, pour the magnesium powder ethanol mixture evenly into the ethanol dispersion of graphene nanosheets after ultrasonic dispersion treatment and continue to maintain ...

Embodiment 3

[0049] A preparation method for improving the semi-solid structure of a magnesium-based composite material, comprising the following steps:

[0050] (1) Graphene nanosheets with a thickness of 4-20nm, a microchip size of 5-10μm, and a layer number of less than 20 are mixed with absolute ethanol in a beaker and mixed with 3.5g of graphene nanosheets per 100mL of ethanol. Ultrasonic dispersion treatment was carried out in the cleaning instrument for 150 minutes, the ultrasonic power was 480W, and the frequency was 45kHz; the purity ≧ 99.5%, the particle size of 100-200 mesh magnesium powder and absolute ethanol were mixed in a beaker with 46.5g of magnesium powder per 150mL of ethanol and passed through Mix by mechanical stirring, the stirring speed is 120r / min, and the time is 150min; Then, pour the magnesium powder ethanol mixture evenly into the ethanol dispersion of graphene nanosheets after the ultrasonic dispersion treatment and continue to maintain the same power, frequenc...

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PUM

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Abstract

The invention provides a preparation method for improving a semi-solid structure of a magnesium-based composite material. The preparation method comprises the steps that under the casting condition, magnesium samarium intermediate alloy is added into a melt in batches, after heat preservation is conducted for a period of time, magnesium graphene intermediate prefabricated blocks are added into the melt in batches through high-energy ultrasound, then the temperature is rapidly reduced to be close to a semi-solid interval, the ultrasound continues, then water quenching is rapidly conducted, and finally the semi-solid structure which is uniformly spheroidized is obtained under the proper technological parameter conditions. The preparation method is stable in technology, environmentally friendly and safe, the prepared semi-solid slurry structure is obviously refined, the interface bonding of graphene and a substrate is good, and the distribution of secondary phases is also relatively uniform.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a preparation method for improving the semi-solid structure of a magnesium-based composite material. Background technique [0002] Magnesium alloys have many excellent material properties, such as high specific strength, high specific stiffness, good thermal conductivity and good electromagnetic shielding, etc., and are known as "green engineering materials in the 21st century". Due to the special properties of magnesium alloys, especially with the emphasis on carbon emissions at home and abroad, the requirements for lightweight and green environmental protection are gradually highlighted, and the application of magnesium alloys is becoming more and more extensive, especially in industrial fields such as automobiles and aerospace. It is even considered to be the most promising lightweight structural metal material in these two industries. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22F3/02C22C23/02B22F1/00B22F3/10
CPCB22F1/0003C22C1/03C22F3/02C22C23/02B22F3/10B22F2302/40Y02P10/25
Inventor 闫洪熊俊杰胡志
Owner NANCHANG UNIV