A device and method for flipping vacuum pressure near-net-shaped magnesium-based composite materials

Abstract

The invention discloses a device and method for turning over vacuum pressure near-net forming magnesium-based composite materials, and belongs to the technical field of magnesium-based composite material air pressure infiltration forming. The device fixes the prefabricated body in the upper crucible through the prefabricated body bracket, and puts magnesium alloy in the lower crucible, and uses the heating body to heat the outer crucible to melt the magnesium alloy in the Ar gas protective atmosphere; during the heating process, the molten alloy liquid and the prefabricated Body separation can avoid the interfacial reaction between the two to form a brittle phase. After the metal is melted, turn the furnace body to make it upside down, and pressurize the outer crucible through the gas pipeline. After the impregnation is completed, put the furnace body upright to make the excess magnesium alloy flow back to the lower crucible. The device is small in size and easy to operate, and can realize near-net shaping of complex parts. Due to the use of gas pressurization, the shape of the prepared composite material is no longer limited; melting, impregnation, and demoulding of the composite material are carried out in a closed environment, which can avoid the oxidation of the magnesium alloy during the entire forming process.

Description

technical field [0001] The invention relates to the technical field of air pressure infiltration forming of magnesium-based composite materials, in particular to a device and method for turning over vacuum pressure near net forming magnesium-based composite materials. Background technique [0002] Due to its low density, high specific strength, high specific stiffness, low thermal expansion coefficient, good dimensional stability and superior damping performance, magnesium-based composite materials have become the most promising high-tech materials in the fields of aviation, aerospace, automobiles and electronics industries. One of the performance materials. [0003] At present, there are many methods for preparing magnesium-based composite materials, mainly including in-situ method, spray deposition method, powder metallurgy method, liquid infiltration method, stirring casting method, etc. Among them, the liquid infiltration method is the most ideal and successful method fo...

AI Technical Summary

Problems solved by technology

This method realizes the integration of alloy smelting and composite material extrusion forming. The preparation device has the characteristics of low cost, convenient pressurization, and high safety. The contact time between the molten metal and the prefabricated body is long, and the interface reaction is prone to generate brittle phases, which affects the performance of the composite material. It is difficult to achieve near-net shape because the excess alloy needs to be removed by cutting. Fourth, this method can only prepare cylindrical composite materials with simple shapes, and the shape of composite materials is limited.

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