Vacuum mechanical dual-stirring casting method for preparing granule reinforced aluminium-base composite material

Abstract

The present invention relates to a vacuum mechanical double-stirring casting method for preparing granule reinforced aluminium base composite material. Said method includes the following steps: melting and purifying aluminium material, cooling and deslagging; under the condition of vacuum reverse slowly internal stirring to implement degassing process, adding the pretreated reinforcing granules onto the deslagged aluminium liquid surface, internal and external forward simultaneously stirring, mixing the reinforcing granules into the melt, stoping external stirring, under the condition of retaining stable liquid surface high-speed internal stirring so as to make the reinforcing granules be uniformly distributed in the liquid, heating, internal and external reverse double stirring and slowly rotating to implement degassing; adding alternant and fining agent, internal stirring slowly rotating so as to make them be mixed into melt and uniformly distributed, removing vacuum, tapping and casting to obtain ingot casting.

Description

technical field [0001] The invention relates to a vacuum mechanical double-stirred casting method for preparing particle-reinforced aluminum-based composite materials, in particular to a method for preparing composite materials through internal and external double-stirring under vacuum conditions. Background technique [0002] Particle-reinforced aluminum matrix composites have attracted extensive attention and research from various countries due to their excellent properties such as high specific strength, specific stiffness and specific modulus, good wear resistance, low density and good thermal conductivity. So far, the relatively mature preparation methods of ceramic particle-reinforced aluminum matrix composites include powder metallurgy, pressure infiltration, spray deposition and stirring casting. The most competitive and promising methods are powder metallurgy and stirring casting. . Compared with the powder metallurgy method, the mechanical stirring casting method ...

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Problems solved by technology

[0004] The technology to be solved in the present invention is aimed at the problems of poor wettability between the reinforced particles and the matrix melt, difficulty in entering and uniformly dispersing the reinforced particles in the melt, and high porosity of the composite material during the preparation of particle-reinforced aluminum-based composite materials by mechanical stirring casting. , to provide a method for preparing high-quality particle-reinforced aluminum matrix composites with vacuum mechanical double stirring

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