Device for preparing special-shaped metal-based porous composite material

Abstract

The invention discloses a device for preparing a special-shaped metal-based porous composite material. The device comprises a melt preparation system, a pressurization system, a diversion component, a casting system and a vacuumizing system, wherein the diversion component is communicated with the melt preparation system and the casting system, and a melting crucible in the melt preparation system is directly communicated with the pressurization system; and a casting chamber in the casting system is connected with the vacuumizing system. After negative pressure is formed in the casting chamber by vacummizing, a metal melt in the melting crucible enters a casting chamber mold filled with pore-forming particles through the diversion component; and after the melt in the casting chamber mold reaches the preset height, the melt in the casting chamber mold is condensed under the dual functions of the negative pressure in the casting chamber and the positive pressure in the melting crucible. By the method, complex special-shaped porous metal members can be prepared, and the defects of common insufficient seepage, excessive seepage and the like in the conventional casting method, and the defects of crystallization porosity inside castings and the like can be effectively overcome.

Description

technical field [0001] The invention relates to a device for preparing a special-shaped metal-based porous composite material substantially free of casting defects. Background technique [0002] Metal-based porous materials are a kind of composite materials with a large number of bubbles inside and the bubbles are distributed in the continuous metal phase to form a pore structure. It organically combines the metal characteristics of the continuous phase aluminum and the pore characteristics of the dispersed phase pores, making it It has the characteristics of light density, good energy absorption performance, unique acoustic and thermal performance, and excellent electromagnetic shielding, which also makes it have great application potential in the fields of construction, rail transit, machinery manufacturing, and aerospace. [0003] Since Soknics.B etc. added mercury to the molten metal in 1948 and obtained metal materials with holes, people have developed a variety of poro...

AI Technical Summary

Problems solved by technology

However, the current infiltration casting method has the following disadvantages: (1) it is difficult to accurately control the production, and defects such as insufficient infiltration and excessive infiltration are prone to occur, resulting in a large amount of waste of metal raw materials; (2) the operation is difficult

For example, in the case of vacuum seepage, the vacuuming time is generally several seconds to more than ten seconds, which is difficult to control accurately; when the molten metal is poured into the mold, the filler particles are impacted, which is easy to form depressions and affect the shape of the product; seepage Not sure when it will end

(3) It is difficult to prepare large-sized seepage products; (4) Usually batch production

In order to avoid the casting defects of the existing infiltration method, the applicant of the present invention once applied for a patent (name: a percolation device for preparing metal foam by infiltration casting method, patent number: ZL200710034420.1), which can effectively avoid the traditional infiltration method Most of the defects that exist, especially can effectively avoid the occurrence of defects such as insufficient seepage and excessive seepage. At the same time, it can also be used to prepare large-scale seepage products; however, this patent is used to prepare special-shaped components with complex shapes (such as engine casings) , Especially when used to prepare thin-walled components (such as automobile doors), there are problems such as insufficient component strength and difficulty in completely filling the metal melt in some complex parts of special-shaped components. The root cause of these problems is the porosity and the easy occurrence of shrinkage cavities in the solidification of metal liquids

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