Device and method for preparing aluminum-base composite material by using vacuum impregnation andsolid-liquid direct extrusion

Abstract

The invention relates to a device and a method for preparing an aluminum-base composite material by using vacuum impregnation and solid-liquid direction extrusion. A smelting furnace is installed on the upper surface of a bottom pallet, the bottom pallet and a mould outer cover are placed on the upper surface of a mould support. A top block is arranged at the bottom of an inner cavity of the smelting furnace. The upper end surface of a top rod is matched with the top block, and the lower end surface of the top rod comes into contact with a piston rod of an ejection cylinder of a four-column hydraulic press. The device accomplishes the four processes of aluminum alloy vacuum smelting, impregnation, extrusion and formation required for preparing the high-performance aluminum-base composite material by using a vacuum furnace, a resistor furnace, the four-column hydraulic press and an extruding and impregnating mould, reduces the defects of shrinkage cavities, shrinkage porosity and cavities of the composite material, increases the density and improves the performance of the aluminum-base composite material, and aluminum-base composite material pieces with different shapes and sizes formed according to the matched degrees of concave dies and convex dies. The device realizes automatic ejection of the aluminum-base composite material through an ejection structure and reduces the formation and processing procedures of parts.

Description

technical field [0001] The invention relates to the field of material forming, in particular to a vacuum impregnation-solid-liquid direct extrusion device and method for preparing aluminum-based composite materials. Background technique [0002] Aluminum matrix composite material has the advantages of low density, high specific strength, high specific modulus, high temperature resistance, wear resistance, small thermal expansion coefficient, good dimensional stability and excellent casting performance. It is a lightweight and high-performance structure Materials are widely used in the fields of aerospace, military defense, automobiles, electronic instruments and other industries. [0003] High vacuum, high volume fraction and high density are the key factors for preparing high-performance aluminum matrix composites. At present, the common preparation methods of aluminum matrix composites include stirring casting method, powder metallurgy method, vacuum pressure infiltration...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art of high critical infiltration pressure of preforms with high volume fraction, difficulty in ensuring high vacuum degree, and low density, and realize the overall and near-net forming of some complex aluminum matrix composite parts, this paper The invention proposes a vacuum impregnation-solid-liquid direct extrusion device and method for preparing aluminum matrix composites

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