A kind of preparation method of double size silicon carbide particle hybrid reinforced magnesium matrix composite material

Abstract

The invention discloses a preparation method of a double-size silicon carbide particle hybrid reinforced magnesium matrix composite material, and aims at solving the problem that in the prior art, the compatibility between the silicon carbide particles and the magnesium alloys is bad so that the silicon carbide particles are easy to aggregate. The preparation method comprises the steps of: (1) mixing to obtain double-size silicon carbide particles; and (2) placing the double-size silicon carbide particles in a semi-solid magnesium matrix and carrying out stirring, ultrasonic dispersion and die-casting to obtain the double-size silicon carbide particle hybrid reinforced magnesium matrix composite material. The preparation method has the advantages that (1) the problem that the silicon carbide particles are difficultly and evenly dispersed in the matrix is effectively solved so as to give full play to the particle reinforcement effect; and (2) the mechanical property is remarkably improved. The preparation method is mainly used for preparing the double-size silicon carbide particle hybrid reinforced magnesium matrix composite material.

Description

technical field [0001] The invention relates to a preparation method of a silicon carbide particle reinforced magnesium-based composite material. Background technique [0002] Silicon carbide (SiC) is smelted from quartz sand, petroleum coke and wood chips at high temperature in a resistance furnace. At present, the silicon carbide produced in my country is divided into black silicon carbide and green silicon carbide, both of which are hexagonal crystals, with a specific gravity of 3.20~3.25 and a microhardness of 2840~3320kg / mm 2 . Black silicon carbide contains about 95% SiC, its toughness is higher than that of green silicon carbide, and it is mostly used for processing materials with low tensile strength. Green silicon carbide contains more than 97% SiC and has good self-sharpening properties. It is mostly used for processing hard alloys, titanium alloys and optical glass, and is also used for honing cylinder liners and fine grinding high-speed steel tools. In additio...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the prior art that the compatibility between silicon carbide particles and magnesium alloys is not good, which leads to the problem that silicon carbide particles are very easy to agglomerate, and to provide a double-sized silicon carbide particle hybrid reinforced magnesium-based composite material. Preparation

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