Preparation method of aluminum-based composite material

Abstract

The invention relates to a preparation method of an aluminum-based composite material. The preparation method comprises steps: melting down pure aluminum or aluminum alloy, and adding a titanium-containing additive while mixing to obtain a composite aluminum alloy melt A, wherein the titanium-containing additive in the composite aluminum alloy melt A is 0.01-5 wt%; after the composite aluminum alloy melt A is subjected to degasification and slag removal treatment, cooling the composite aluminum alloy melt A rapidly to be in a semi-solid state, and adding SiC powder which is preheated and subjected to high-temperature oxidation treatment while stirring to obtain a composite aluminum alloy melt B, wherein the use level of SiC powder is 0.1-10 wt% of the composite aluminum alloy melt B; heating the composite aluminum alloy melt B to be in an overheated liquid state, casting the heated composite aluminum alloy melt B into a preheated metal mould after the heated composite aluminum alloy melt B is mixed, and demoulding to obtain a cast type product; and putting the preheated cast type product in the mould and producing a final product by virtue of a hot extrusion process. Double strengthening functions of a titanium element and hot extrusion are utilized in the invention, so that mechanical properties of the aluminum-based composite material are improved greatly; and in addition, the process is simple, the cost is low, and industrial production in batches is easy to implement.

Description

technical field [0001] The invention relates to a preparation method of an aluminum-based composite material. Background technique [0002] Silicon carbide particle-reinforced aluminum matrix composites have the advantages of light weight, high strength and hardness, low thermal expansion coefficient, wear resistance and corrosion resistance, and are widely used in aerospace, military industry, electronic packaging, transportation and other fields, and are developed by countries all over the world. High-performance composite materials that comply with the development trend of lightweight. At present, the main preparation processes of silicon carbide particle reinforced aluminum matrix composites include stirring casting method, powder metallurgy method, melt infiltration method, spray deposition method, etc. Among them, the stirring casting method has the advantages of simple process, low cost and high production efficiency. become a research hotspot in various countries. ...

AI Technical Summary

Problems solved by technology

Although the particle modification method effectively improves the wettability and material properties, it is not conducive to the rapid production of final composite materials considering the cost of raw materials and the long preparation time of batch composite powders

In addition, there are still researches focused on the optimization of the stirring composite process. The invention patent with the publication number CN102154573A introduces vacuum atmosphere stirring, but it does not substantially improve the interface properties of silicon carbide particles and aluminum alloy matrix

Many literatures have reported the optimization of stirring parameters, such as compounding temperature, holding temperature, stirring time, stirring speed, etc. However, due to many influencing factors, the optimization process is complicated, and it is difficult to draw more accurate conclusions

In contrast, little research has been reported on the reduction or elimination of material defects

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