A preparation method of modified carbon nanotube reinforced aluminum alloy semi-solid slurry

Abstract

The invention provides a method for preparing a modified carbon nanotube reinforced aluminum alloy semi-solid slurry: by performing ZrO on the surface of the carbon nanotube 2 modified, and made carbon nanotubes into Al‑ZrO 2 @CNTs‑KAlF 4 Intermediate precast blocks. Under the conditions of melting and casting, after the Al-Si alloy is refined, the intermediate prefabricated block is pressed into the melt with a bell jar under the protection of argon, and a 2.1-3.2kW high-energy ultrasonic is applied during the addition process, and then the temperature is dropped rapidly. Perform high-energy ultrasonication for 60‑90s twice in the semi-solid temperature range, followed by rapid water quenching. Finally, a semi-solid structure with uniform dispersion of carbon nanotubes and fully spheroidized grains was obtained under the optimal process conditions. The invention has the advantages of safe operation, stable process, obviously refined structure of the prepared semi-solid slurry, and good interface bonding between the carbon nanotube and the alloy melt.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a preparation method of modified carbon nanotube reinforced aluminum alloy semi-solid slurry. Background technique [0002] In recent years, a green and low-carbon lifestyle has been vigorously advocated, and scientific exploration is also trying to find a breakthrough in green development. At present, cars are becoming more and more personalized, and additional devices further increase the weight of the car body. Therefore, lightweight parts are an inevitable choice for car companies to achieve the goals of reducing body weight and exhaust emissions. For this reason, more and more body parts are gradually replaced by aluminum alloy parts, such as cylinder blocks, cylinder heads, wheels, transmission housings and other shell parts, as well as body panels such as doors, engine covers, and roof covers. However, pure aluminum alloy sometimes cannot ...

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Problems solved by technology

However, in this method, the carbon nanotubes are poorly dispersed in the aqueous solution, which easily causes 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 operable, but the density of non-metallic materials containing graphene or / and carbon nanotubes is too small compared to metal materials, and after adding them, they are easy to reunite on the surface of the melt during the high-speed stirring process, and the obtained semi-solid metal matrix composite slurry The dispersion of carbon nanotubes in the material is poor, and the grains inside the material are easy to grow without being chilled after die-casting, and it is difficult to obtain a semi-solid spherical grain structure