Preparation method of magnesium-based composite material applied to automobile differential support

Abstract

The invention discloses a preparation method of a magnesium-based composite material applied to an automobile differential support, and relates to a preparation method of a composite material appliedto the automobile differential support. The method aims at solving the technical problem that an existing AZ91D magnesium alloy is not strong enough to replace an aluminum alloy for an automobile differential support. Through spinning spraying and bidirectional stirring, high-entropy alloy particles are added into an AZ91D magnesium alloy melt, the stirring time can be shortened, and the aggregation effect of broken particles is remarkable; X-direction and Y-direction mechanical vibration is conducted simultaneously, aggregation of the particles in a broken side wall area is facilitated, and thus the particles in the side wall area are stirred to the middle of the melt along with shearing to be sufficiently mixed with the melt; and a screen net is placed on the surface of molten metal in amaterial barrel to filter oxidized slag inclusions, and finally an extrusion casting process is conducted to prepare a product. The high-entropy alloy particles are uniformly dispersed, the strengthand hardness of the product are also greatly improved, the interior of the product is free of defects of oxidized slag inclusions, the particles are combined with a base body well, and the applicationsituation of the magnesium-based composite material can be further broadened.

Description

technical field [0001] The invention relates to a preparation method of a magnesium-based composite material applied to an automobile differential bracket. Background technique [0002] Magnesium alloy has the advantages of low density (about two-thirds of that of aluminum alloy), high specific strength, and good shock resistance and damping performance. It has broad application prospects in the fields of automobiles and electronic products. However, the low hardness, low room temperature strength and plasticity of magnesium alloys largely limit its application. Magnesium-based composites can eliminate or alleviate the disadvantages of the above-mentioned magnesium alloys. The process of adding particle-reinforced metal matrix composites is simple and low-cost. For example, adding SiC particles can improve the strength and hardness of magnesium alloys. Due to the natural compatibility between metals and metals, adding metal particles inside the liquid metal can overcome th...

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the technical problem that the existing AZ91D magnesium alloy replaces the aluminum alloy for the insufficient strength of the automobile differential bracket, and provides a preparation method of a magnesium-based composite material applied to the automobile differential bracket to realize the magnesium-based composite material. Materials The automobile differential bracket replaces the existing aluminum alloy differential bracket. During the preparation of the magnesium-based composite material, two-way rotating injection and stirring are used to solve the problem of uneven particle agglomeration and stirring in the side wall area of ​​the melting furnace, and to achieve uniform particle size. The effect of dispersion and all-position refining of the melt, a screen is placed on the surface of the mixed melt in the barrel to effectively filter slag inclusions and oxide defects, and the squeeze casting molding method is used to achieve the effect of improving the strength and hardness, making the differential speed The device bracket meets the requirements of automobile use