Preparation method and system of nano silicon carbide particle reinforced aluminum-based gradient composite material

Abstract

The invention discloses a preparation method of a nano silicon carbide particle reinforced aluminum-based gradient composite material. The system comprises an ultrasonic dispersion reaction cylinder, an ultrasonic dispersion instrument, a lifting, overturning and clamping mechanism, a mixing reaction cylinder, a magnetic stirrer, a drying box, an industrial planetary ball mill, a gradient powder press, a vacuum furnace and a high-temperature furnace which are connected in sequence, the ultrasonic dispersion reaction cylinder is used for containing nano silicon carbide powder to be treated, the ultrasonic dispersion instrument is used for ultrasonically dispersing nano silicon carbide, and the mixing reaction cylinder is used for mixing turbid liquid containing silicon carbide reinforcement and 2014A1 alloy turbid liquid. Turbid liquid containing silicon carbide reinforcement in the reaction cylinder is ultrasonically dispersed through the lifting, overturning and clamping mechanism and added into the mixing reaction cylinder, the magnetic stirrer is used for stirring liquid in the mixing reaction cylinder, the drying box is used for drying preliminarily mixed powder, and the industrial planetary ball mill is used for grinding composite material powder, and the gradient powder press is used for extrusion forming of nanometer silicon carbide / 2014Al composite material powder. The tight combination of SiC and 2014A1 matrix is realized, elastic modulus, yield strength and tensile strength of the aluminum matrix are greatly improved, and plasticity of the composite material is not obviously sacrificed.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method and system for nano-silicon carbide particle-reinforced aluminum-based gradient composite materials. Background technique [0002] Silicon carbide particle reinforced aluminum matrix composites have the advantages of low density, high specific modulus, high specific strength, low expansion, high thermal conductivity, good wear resistance, high damping and low cost. The civil field shows broad application prospects. The shortcomings of micron-sized SiCp / Al composites are that the strength increases but the plasticity decreases significantly, and the high-temperature mechanical properties are not satisfactory, which has become a bottleneck problem restricting its development. In recent years, it has been gradually proposed to use nano-SiC as a reinforcement to solve this problem. However, nano-sized SiC particles have high specific s...

AI Technical Summary

Problems solved by technology

The disadvantages of micron-sized SiCp / Al composites are that the strength increases but the plasticity decreases significantly, and the high-temperature mechanical properties are not satisfactory, which has become a bottleneck problem restricting its development.

However, most of the additive phases used in existing gradient composites are usually in the micron-scale field, and there are few reports on the progress of preparing functionally graded aluminum matrix composites by adding nano-ceramic particles.

[0004] In addition, the production of nano-sized particle-reinforced aluminum-matrix composites is still in its infancy. The existing production lines for nano-sized particle-reinforced aluminum-based composites are not highly automated, with small production capacity and low production efficiency.

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