A method for preparing in-situ three-dimensional continuous reinforced al-based composites

Abstract

The invention discloses a method for preparing an in-situ three-dimensional continuous reinforced Al-based composite material. First, Ti powder, Al powder and graphite powder are mixed according to a molar ratio of 2:(1-1.2):1, and then ground to obtain a mixed powder. ; Then put the mixed powder into the mold for cold pressing to obtain a green body; finally preheat the green body and add it to the Al melt at a temperature of 700-900 ° C, and take the green body out of the melt to cool after the reaction , that is, the in-situ three-dimensional continuous reinforced Al-based composite material is obtained. The invention utilizes the thermal explosion reaction of the Al-Ti-C system to rapidly prepare the in-situ three-dimensional continuous reinforced Al-based composite material.

Description

technical field [0001] The invention belongs to the field of preparation of advanced metal-based composite materials, and in particular relates to a method for preparing in-situ three-dimensional continuous reinforced Al-based composite materials. Background technique [0002] Three-dimensional continuous reinforced Al-based composites, also known as network crossed Al-based composites, the reinforcement and the Al matrix are continuous in three-dimensional space and interpenetrate to form a network structure. Compared with traditional particle and fiber reinforced Al-based composite materials, this composite configuration is more helpful to give full play to the performance of reinforcement and matrix. Therefore, three-dimensional continuous reinforced Al-based composites have high strength, high hardness, good wear resistance and thermal shock resistance, high thermal conductivity, low thermal expansion coefficient, and are widely used in aerospace, automotive, electronics...

AI Technical Summary

Problems solved by technology

Porous preforms can be prepared by organic precursor impregnation method, powder sintering method, ablation method, foam hanging method, sol-gel method, etc., but the above methods often have problems such as complicated preparation process and low preform strength.

On the other hand, during the filling process of Al melt, auxiliary processes such as impregnation, extrusion, and die-casting are usually required, and defects (cracks, interface reactions, etc.) are prone to occur at the interface between the Al matrix and the reinforcement, which will affect the performance of the composite material.

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