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Method for preparing carbon nanotubes reinforced AZ61 magnesium alloy semi-solid slurry

A semi-solid slurry and carbon nanotube technology, which is applied in the field of metal material manufacturing, can solve the problems of carbon nanotubes easy to agglomerate, easy to float, agglomerate, turbulence difficult to control, etc., to achieve improved bonding quality, safe operation and stable process Effect

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

However, in this method, the carbon nanotubes are poorly dispersed in the aqueous solution, which is easy to cause the aggregation of the carbon nanotubes themselves, and the nano-zirconia particles themselves are easy to agglomerate, which also makes this method have certain application limitations.
[0005] On the other hand, in the preparation process of semi-solid slurry of carbon nanotubes / metal matrix composites, carbon nanotubes are easy to agglomerate in the melt, and the bonding with the melt interface is poor, resulting in uneven distribution of the reinforcing phase. The promotion and application of such composite materials
The process is simple and environmentally friendly, but it is difficult to control the dispersion state of carbon nanotubes during the melting process, and the pulverization of carbon nanotubes will damage their own excellent mechanical properties to a certain extent, which is not conducive to the improvement of the performance of composite materials.
In the publication number CN108085549A, titled "A Method for Preparing New Magnesium-Based Composite Materials with Ultrasonic-Assisted Mechanical Stirring", by pre-dispersing carbon nanotubes, stirring in the semi-solid region of the alloy melt, and adding carbon nanotubes, Afterwards, the melt is heated up, kept warm, cooled and dispersed ultrasonically. This process uses stirring and ultrasonic dispersion methods to promote the dispersion of carbon nanotubes in the melt to a certain extent, but it is difficult to control the size of the stirring vortex and the turbulent flow formed. Moreover, compared with the alloy, the density of carbon nanotubes is too small, and it is easy to float and agglomerate in the process of direct addition, and the problem of poor bonding with the alloy melt interface is difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing carbon nanotube reinforced AZ61 magnesium alloy semi-solid slurry:

[0042] (1) Take the AZ61 alloy, the proportion of each element in the alloy is: aluminum 5.8%-7.2%, zinc 0.4%-1.5%, and the balance is magnesium; prepare carbon nanotubes: the outer diameter is 20-60nm, and the length is 10- 30μm, purity ≥ 99.9%; magnesium powder, aluminum powder, zinc powder purity ≥ 99.9%, particle size 100-200 mesh.

[0043] (2) Prepare an acid solution with a volume ratio of concentrated nitric acid and concentrated sulfuric acid of 1:3, add 3.0 g of carbon nanotubes per 100 mL of acid solution, heat to 80 ° C under magnetic stirring, condense and reflux for 4 hours, and the magnetic stirring speed The temperature is 900r / min, and then filtered with deionized water for 3-4 times until the filtrate is neutral, then placed in a vacuum drying oven to raise the temperature to 70°C, and kept for 18 hours to obtain purified carbon nanotubes.

[0044] (3) ① With zi...

Embodiment 2

[0049] A method for preparing carbon nanotube reinforced AZ61 magnesium alloy semi-solid slurry:

[0050] (1) Take the AZ61 alloy, the proportion of each element in the alloy is: aluminum 5.8%-7.2%, zinc 0.4%-1.5%, and the balance is magnesium; prepare carbon nanotubes: the outer diameter is 20-60nm, and the length is 10- 30μm, purity ≥ 99.9%; magnesium powder, aluminum powder, zinc powder purity ≥ 99.9%, particle size 100-200 mesh.

[0051] (2) Prepare an acid solution with a volume ratio of concentrated nitric acid and concentrated sulfuric acid of 1:3, add 2.5 g of carbon nanotubes for every 100 mL of acid solution, heat to 80 ° C under magnetic stirring, condense and reflux for 4 hours, and the magnetic stirring speed 800r / min, and then filter with deionized water for 3-4 times until the filtrate is neutral, then place it in a vacuum drying oven to raise the temperature to 70°C, and keep it warm for 15 hours to obtain purified carbon nanotubes.

[0052] (3) ① With zirconi...

Embodiment 3

[0057] A method for preparing carbon nanotube reinforced AZ61 magnesium alloy semi-solid slurry:

[0058] (1) Take the AZ61 alloy, the proportion of each element in the alloy is: aluminum 5.8%-7.2%, zinc 0.4%-1.5%, and the balance is magnesium; prepare carbon nanotubes: the outer diameter is 20-60nm, and the length is 10- 30μm, purity ≥ 99.9%; magnesium powder, aluminum powder, zinc powder purity ≥ 99.9%, particle size 100-200 mesh.

[0059] (2) Prepare an acid solution with a volume ratio of concentrated nitric acid and concentrated sulfuric acid of 1:3, add 3.5 g of carbon nanotubes per 100 mL of acid solution, heat to 80 ° C under magnetic stirring, condense and reflux for 4 hours, and the magnetic stirring speed The temperature is 1000r / min, and then filtered with deionized water for 3-4 times until the filtrate is neutral, then placed in a vacuum drying oven and heated to 70°C, and kept for 20 hours to obtain purified carbon nanotubes.

[0060] (3) ① With zirconium oxych...

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Abstract

The invention discloses a method for preparing carbon nanotubes reinforced AZ61 magnesium alloy semi-solid slurry. The method comprises the following steps that ZrO2 coating is carried out on the surfaces of the carbon nanotubes, and the carbon nanotubes are prepared into an Mg-Al-Zn-ZrO2@CNTs intermediate precast block; under the casting condition, after AZ61 magnesium alloy is refined, a bell jar is used for pressing the intermediate precast block into an alloy melt in the argon protection state; high-energy ultrasound is applied in the adding process; then the temperature is rapidly reduced to 560-620 DEG C, heat preservation is carried out, short-time secondary high-energy ultrasound is applied, and then rapid water quenching is carried out; and finally, a semi-solid structure in which the carbon nanotubes are uniformly dispersed and magnesium alloy grains are fully spheroidized is prepared under an optimized process condition. The preparation method is safe to operate and stable in process, the structure of the prepared semi-solid slurry is obviously refined, and the interface bonding of the carbon nanotubes and the AZ61 magnesium alloy melt is good.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacture, and in particular relates to a method for preparing carbon nanotube reinforced AZ61 magnesium alloy semi-solid slurry. 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. AZ61 magnesium alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C22C23/00
CPCC22C1/1036C22C23/00C22C26/00C22C2026/002C22C1/1047
Inventor 闫洪刘智彬雷雨顺胡志
Owner NANCHANG UNIV
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