Nickel aluminum powder atomization preparation method

Abstract

The invention discloses a nickel aluminum powder atomization preparation method. The method comprises vacuumizing and smelting by heating; then, a melt is guided into a centrifugal nozzle; the centrifugal nozzle starts centrifugal rotation; meanwhile, an inertia gas nozzle sprays out argon; meanwhile, a control system controls opening and closing of an electromagnetic valve in a liquid drainage port on the centrifugal nozzle in a pulse manner; the melt is thrown out in the pulse manner; liquid currents sprayed at each time are aligned to an atomization gas spraying direction; the melt is directly impacted with atomization gas to crush as fine drops under the effect of the air currents; the fine drops are cooled to condense as fine powder; then, the fine powder is fed in a collecting chamber; and the fine powder is separated by a cyclone separator for collection after screening by a vibration screen.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to an atomization preparation method of nickel-aluminum powder. Background technique [0002] Intermetallic Ni 3 Al has abnormal yield strength-temperature effect, as well as high wear resistance and corrosion resistance. It has become an important structural material in the contemporary aerospace industry, civil industry and other fields, especially in the field of aeroengine blades. prospect. 3D printing, or additive manufacturing, is a rapid prototyping process that has emerged in recent years. It adopts layer-by-layer powder coating, laser or electron beam melting and molding to realize the finishing molding of precision parts and avoid the occurrence of defects in the casting process. Defects such as shrinkage cavity and porosity have become a new material processing method. [0003] At present, the powder used in 3D printing is generally obtained by ...

AI Technical Summary

Problems solved by technology

Part of the more advanced technology uses the centrifugal method to atomize the melt after being thrown out. In the process of using centrifugal throwing, the inventor has found through research that the blowing speed and angle of the gas in the atomization process after the melt is thrown out, the liquid The direction of the flow has an impact on the effect of atomization and the particle size of the powder after atomization, but the current centrifugal process adopts the method of blowing air after continuous centrifugation, which makes the particle size distribution of the prepared powder uneven