Feeding device of reinforcing particles of metallic matrix composite material cast by vacuum mixing

Abstract

The invention provides a feeding device of reinforcing particles of a metallic matrix composite material cast by vacuum mixing, which comprises a vacuum mixing smelting furnace and a hopper, wherein a vacuum mixing smelting furnace cover is arranged at the upper end of the vacuum mixing smelting furnace; a particle conveying device is arranged at the side upper part of the vacuum mixing smelting furnace cover through a bracket and is obliquely arranged; the upper end of the particle conveying device is communicated with the bottom end of the hopper through a hose; a vacuum valve is arranged on a bottom end port of the hopper; a hopper cover is arranged at the top end of the hopper and is connected with a vacuumizing bypass interface which is connected with a vacuumizing system; an inert gas sweeping device is also arranged on the hopper cover and is arranged in the hopper; and the inert gas sweeping device is connected with an inert gas source device through an external interface. According to the feeding device, the feeding mount and the feeding speed of particles can be accurately controlled and the aims of improving the quality of the composite material and the quality stability are achieved.

Description

technical field [0001] The invention relates to a feeding device for vacuum stirring and casting particle-reinforced metal-based composite materials, which belongs to the field of composite material preparation. Background technique [0002] The development of modern science and technology has higher and higher requirements for material performance, and it is often difficult for a single material to meet the use requirements. Compared with traditional metal materials, particle-reinforced metal matrix composites have the advantages of higher specific strength, specific stiffness, wear resistance and small thermal expansion coefficient. New materials have become a hot spot in material research at home and abroad. [0003] Commonly used methods for preparing particle-reinforced metal matrix composites include powder metallurgy, spray deposition, and vacuum stirring casting. Among them, vacuum stirring casting refers to adding reinforcing particles to the metal melt in a certa...

AI Technical Summary

Problems solved by technology

The problem with this method is that the particles accumulated on the surface of the melt for a long time will cause the temperature of the particles to rise and agglomerate, which increases the difficulty of dispersion in the melt; at the same time, the particles will form oxide slag when they contact the high-temperature melt under non-vacuum conditions. , reducing the quality of the composite

The problem with this method is that the particles need to be treated at high temperature for a long time in the pretreatment furnace, which will easily cause deformation of the pretreatment furnace and affect the vacuum sealing of the whole device

Moreover, the reinforcing particles are easily adsorbed on the inner wall of the pretreatment furnace, the feeding mechanism and the gap between them and the transmission channel. It is impossible to accurately control the amount of particles added, and it is difficult to ensure the quality stability of the composite material.

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