A forming system and method for multiphase reinforced metal matrix composites

Abstract

The invention provides a multi-phase reinforced metal matrix composite forming system and method. The system comprises the following two parts: a gas-solid two-phase atomized spray forming device and a hot extrusion device, wherein the gas-solid two-phase atomized spray forming device comprises a vacuum chamber, a medium-frequency power supply, a powder bin, a ball valve, a gas speed reducer, a gas storage bottle, a controller, an over-spray powder collector, a receiver, an atomizing nozzle, an induction coil, a go / no go gauge, a linear motor, a temperature sensor, a crucible, a motor controller, a temperature display terminal, a fixing bracket, a partition plate and a vacuum machine; and the hot extrusion device comprises a convex die, an extrusion cylinder, an extrusion mat, a concave die, a backing plate, an induction power supply, a thermal insulator, a heating coil and temperature probe. By adoption of the gas-solid two-phase atomized spray forming device and the method provided by the invention, a ceramic particle and metal whisker multi-phased reinforced metal matrix composite can be directly produced; and a whisker reinforced phase can be generated through hot extrusion in a densifying manner, that is, the whisker reinforced phase can be obtained when sedimentary pores are eliminated.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance metal materials, and in particular relates to a forming system and method of multi-phase reinforced metal matrix composite materials. Background technique [0002] Spray forming is a rapid solidification forming process. The process is to atomize molten metal into metal droplets of 10-200 microns, and then driven by high-speed airflow, the tiny droplets are directly sprayed on a cooler receiver to form corresponding products. . Compared with the casting process, the formed material has a microstructure of fine equiaxed grains, homogeneity and no segregation; compared with the rapid solidification powder metallurgy process, the spray-formed blank has low oxygen content, superior comprehensive mechanical properties, and required for forming. Less process and low production cost. In addition, spray blanks do not have surface defects that are inevitable in liquid surface proc...

AI Technical Summary

Problems solved by technology

[0003] Spray deposition technology was first introduced into the field of preparing metal matrix composite materials by Lavernia (E.J.Lavernia et al, Mater.Sci.Eng., A, 1988,98:381), and the atomization co-deposition technology was proposed. The basic principle The reinforcement phase particles are blown into the metal atomization cone driven by the gas, and the reinforcement particles and the atomized molten droplets are deposited on the receiver together. The deposition of molten droplets is affected, and the uniformity of particle distribution is difficult to ensure, thus affecting the performance of the material

At the same time, the current research on spray co-deposition technology mainly focuses on discontinuous reinforcement metal matrix composites, and there is less research on continuous reinforcement reinforced metal matrix composites, and the preparation of particle and whisker composite phase reinforcement by spray forming technology has not been seen. report

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