A method for preparing hybrid particle reinforced aluminum matrix composite material by composite strengthening method

Abstract

The invention provides a formula and a preparation method for preparing a hybrid particle reinforced aluminum matrix composite material with a compound reinforcement method. The raw material formula composition of the composite material is that Al-Si alloy powder is adopted as a matrix, and nanometer CuO powder and micrometer SiC particles are adopted as in-situ reactants. An Al-Si alloy is adopted as the matrix of the composite material, and the reinforced phases are hybrid particles including micrometer SiC particles, nanometer Al2O3 particles and micrometer AlCu3 particles, wherein the micrometer SiC particles are additionally added, and the nanometer Al2O3 particles and the micrometer AlCu3 particles are prepared by an in-situ reaction. The compound reinforcement method comprises methods such as additionally-added SiC particle reinforcement, in-situ synthesized Al2O3 and AlCu3 particle reinforcement, hot-pressing die forging reinforcement, thermal treatment reinforcement and the like. The preparation technological process of the composite material comprises pretreatment of SiC particles, raw material matching and mixing, die-filling, heating in-situ reacting, hot-pressing die-forging and solid solution and aging heat treatment. The hybrid particle reinforced aluminum matrix composite material prepared with the compound reinforcement method has higher rigidity and abrasive resistance and can be applied to lightweight abrasion-resistant parts such as pistons, cylinder sleeves, brake discs and the like.

Description

technical field [0001] The invention belongs to the field of preparation of aluminum-based composite materials, and in particular relates to a method for preparing mixed particle-reinforced aluminum-based composite materials by a composite strengthening method. Background technique [0002] With the rapid development of metal matrix composites, particle reinforced aluminum matrix composites, as a material with potential application prospects, because of its high specific stiffness, high specific strength, small thermal expansion coefficient, good wear resistance, heat resistance and excellent Excellent characteristics such as dimensional stability can replace steel materials, aluminum alloys and titanium alloys to produce high-performance lightweight parts, so they are widely used in aerospace structural parts, advanced weapons, auto parts, rail transit and sports equipment. At present, most of the reinforcement phases of particle-reinforced aluminum-matrix composites are re...

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Problems solved by technology

The research on the preparation of aluminum matrix composites with high hardness and high wear resistance by using hybrid particle reinforcement is basically blank. The particle size and type of the hybrid particle reinforcement phase, the properties of the aluminum alloy matrix, and the bonding interface between the reinforcement phase particles and the matrix need to be further studied. These problems are closely related to the preparation methods of composite materials. At present, the most commonly used methods for preparing particle-reinforced aluminum matrix composites include powder metallurgy, in-situ synthesis, stirring casting, and squeeze casting. Such problems, such as the composite material prepared by the powder metallurgy method has a certain porosity, the synthesis reaction of the in-situ synthesis method and the control of the reinforced phase generated are relatively difficult, the reinforced phase of the stirred casting method is not easy to be uniformly distributed, and the extrusion casting infiltration method is efficient. Therefore, the research on the preparation process of hybrid particle reinforced aluminum matrix composites is also particularly important

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