Preparation method for local ceramic reinforced aluminum matrix composite wear-resistant part

Abstract

A preparation method for a local ceramic reinforced aluminum matrix composite wear-resistant part includes: firstly, preparing a zirconia toughened alumina (ZTA) preformed part; secondly, fixing the ZTA preformed part in a die forging die and vacuumizing the interior of the die forging die; and finally, injecting aluminum liquid into a runner of the die forging die, squeezing the aluminum liquid into a cavity of the die forging die under high pressure first, then using the forging die for forging and stamping until the aluminum liquid completely solidifies, and separating a male die from a female die so as to fetch the composite wear-resistant part out from the forging die when composite materials completely solidify. By using the preparation method, not only wear-resistant performance of the surface of the composite wear-resistant part is improved, but also effects of the character of high toughness of ZTA particles are simultaneously brought into full play, and probability of internal fragmentation of ceramic is greatly reduced, overall impact resistance of the composite wear-resistant part is improved, and furthermore due to the fact that the composite wear-resistant part is prepared through a method of combining low vacuum die forging with extrusion die forging, the aluminum liquid can be fully composited with the ZTA particles, and the number of internal interstices of the wear-resistant part is decreased. Accordingly, overall intensity of the composite wear-resistant part is improved, and service life of the composite wear-resistant part is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal-matrix composite materials, and in particular relates to a preparation method of partially ceramic-reinforced aluminum-matrix composite wear-resistant parts. Background technique [0002] With the preparation of new materials to meet the requirements of reducing energy consumption, improving the environment and improving product quality, since the 21st century, the annual output of aluminum-based composite wear-resistant parts has reached more than 1,000 tons. Although these aluminum-based composite wear-resistant parts are heat-conducting However, the overall toughness of composite wear-resistant parts is not enough, and it is prone to failure in some harsh working conditions such as high temperature and high impact, resulting in huge losses. At present, the vast majority of aluminum-based composite wear-resistant parts are used in high-tech fields such as aerospace, rail transit, and electronic co...

AI Technical Summary

Problems solved by technology

This preparation method mainly uses SiC particles to prepare prefabricated parts through foaming technology, injection molding and gel injection molding technology. The porous ceramic green body prepared by this method has too much pore-forming agent added, which is easy to leave behind after sintering. Too much residue is not conducive to the infiltration of molten aluminum, and affects the overall performance of the composite layer

Moreover, when this method is used for extrusion casting, the casting aluminum alloy used lacks Mg element, which is not conducive to the wetting between the aluminum liquid and the ceramic; and another aluminum alloy used is a high-strength 7-series aluminum alloy, which is The fluidity of the alloy is not good, which is not conducive to the filling of molten aluminum during extrusion casting, and it is easy to leave a large number of voids inside the composite material. During extrusion casting, the gas in the ceramic body is difficult to discharge, and it is easy to remain and form defects, reducing the material performance