Method and system for preparing particle-reinforced metal-based composite material through injection molding

Abstract

The invention relates to a method and system for preparing a particle-reinforced metal-based composite material through injection molding. Ceramic reinforced particles and high-pressure inert gas are uniformly mixed in an acceleration nozzle to be used as an atomizing medium, thereby improving the density, momentum and impact force of the atomizing medium, obviously enhancing the atomization effect and reducing the inert gas consumption as compared with the atomization based on the single use of inert gas. After atomization is completed, the ceramic particles are uniformly dispersed in atomized molten drops, and the molten metal drops doped with the reinforced particles are gradually solidified in the flying process and are ultimately deposited, solidified and molded on a receiver, thus obtaining the high-performance metal-based composite material of which the ceramic reinforced particles are uniformly distributed. In addition, the ceramic reinforcements used in the invention are prepared by a reaction and ball milling method, thereby ensuring that the reinforced particles better in strength, interface stability, high-temperature performance and other aspects can be prepared at a low cost.

Description

technical field [0001] The invention relates to a method and system for preparing particle-reinforced metal-based composite materials by spray forming, in particular to a method of generating reinforced particles and a method of atomizing molten metal. Background technique [0002] Spray forming technology is an advanced forming technology developed in the past 30 years, which uses rapid solidification method to directly prepare metal material blanks or semi-finished products. The process is to atomize molten metal into liquid particles of 10 to 200 microns, and then driven by high-speed airflow, the tiny particles are directly sprayed on a cooler receiver to form parts or molds with fine grains. Compared with the casting process, the formed material has a fine, equiaxed and homogeneous microstructure without segregation. Particle reinforced metal matrix composites have the advantages of low cost, high modulus, high strength, high wear resistance and easy manufacture. Part...

AI Technical Summary

Problems solved by technology

This forming method has the following disadvantages: (1) Inert gas is used to atomize the molten metal. Due to the low gas density and low momentum, the atomization efficiency is very low, a large amount of inert gas needs to be consumed, and the atomized droplet size distribution is uneven. ; (2) Ceramic particles will affect the flight trajectory of atomized droplets, making it difficult to control the shape of the deposited body

The disadvantages of this nozzle are: (1) The diameter of the powder conveying pipe is small and the length is very large, so the powder is easily blocked in the pipe, which affects the uniform distribution of the reinforcing particles inside the deposition body; (2) due to the wear of the powder conveying pipe Passing through the bottom of the tundish, the outer diameter of the guide tube 24 becomes larger, making the diameter of the air outlet of the high-pressure air chamber larger, which affects the atomization effect of the nozzle

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