Turnover type vacuum pressure near net forming device and method for magnesium-based composite material

Abstract

The invention discloses a turnover type vacuum pressure near net forming device and method for a magnesium-based composite material and belongs to the technical field of magnesium-based composite material air pressure infiltration forming. According to the turnover type vacuum pressure near net forming device, a preform is fixed in an upper crucible through a preform bracket, magnesium alloy is put into a lower crucible, and an outer crucible is heated through a heating body, so that the magnesium alloy is melted in Ar gas protective atmosphere; molten alloy liquid is separated from the preform in the heating process, and the situation that a brittle phase is generated due to the fact that interface reaction occurs between the molten alloy liquid and the preform can be avoided; and after the metal is melted, a furnace body is rotated to be placed upside down, pressurization is conducted in the outer crucible through a gas pipeline, and the furnace body is placed uprightly after infiltration is completed, so that the surplus magnesium alloy flows back to the lower crucible. The turnover type vacuum pressure near net forming device is small in size, easy and convenient to operate and capable of achieving near net forming of complex parts. As gas pressurization is adopted, the shape of the prepared composite material is no longer limited; and smelting, infiltration and composite material demolding are conducted under the airtight environment, and the oxidation phenomenon of the magnesium alloy in the whole forming process can be avoided.

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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