A kind of preparation method of magnesium-based composite material applied to automobile differential bracket

Abstract

The invention relates to a preparation method of a magnesium-based composite material applied to an automobile differential bracket, and relates to a preparation method of a composite material applied to an automobile differential bracket. The invention aims to solve the technical problem that the existing AZ91D magnesium alloy replaces the aluminum alloy and is used for the insufficient strength of the bracket of the differential gear of the automobile. In the present invention, high-entropy alloy particles are added to the AZ91D magnesium alloy melt by rotary blowing and two-way stirring, which can reduce the stirring time, and the effect of agglomeration of the broken particles is remarkable; mechanical vibration in the X and Y directions at the same time is beneficial to the particle agglomeration in the broken side wall area, making the edge The particles in the wall area are stirred into the middle of the melt with shearing and fully mixed with the melt; a screen is placed on the surface of the molten metal in the barrel to filter the oxidized slag inclusions, and finally the extrusion casting process is used to prepare the product. The high-entropy alloy particles of the invention are uniformly dispersed, the strength and hardness of the product are also greatly improved, there is no oxidized slag inclusion defect inside the product, the particles are well combined with the matrix, and the application 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