Development of plasma-arc technologies of spherical granules production for additive manufacturing and powder metallurgy

Abstract

the technological and structural properties of spherical granules and the peculiarities of their production processes using industrial technologies of gas atomization, plasma rotating electrode process and plasma-arc atomization of neutral and current-carrying wires and rods are considered. It was found that among the considered methods of obtaining spherical granules, the most promising in terms of productivity, energy efficiency and simplicity of the equipment used is the method of plasma-arc atomization, which, due to the presence of a large number of technological and structural parameters of the process, allows adjusting the particles size distribution and technological properties of the granules in a wide range. experimental studies have shown that the particles size distribution, shape factor and technological properties of granules from titanium alloys and stainless steel obtained by plasma-arc atomization of current-carrying wire materials at the e.O. paton electric Welding Institute of the nas of ukraine, together with llc r&D plaZer center, are at the level of the best foreign analogues. a promising direction of increasing the energy efficiency and productivity of the process of obtaining spherical granules for additive manufacturing and granule metallurgy using the technology of plasma-arc atomization of current-carrying rods with a diameter of more than 50 mm at reverse polarity by plasma trons with a hollow copper anode is proposed.

Features of the Stress–Strain State of 3D Metal Objects Produced by Additive Microplasma Deposition of the Powder of a Fe–Cr–Ni–B–Si System

“…Equipment described in detail in ref. [26] was used for powder microplasma deposition. It included a power source, which ensured nonconsumable electrode deposition at straight polarity current in the range of 5-100 A and at the voltage of 10-30 V. Plasma arc ignition was performed by a plasma module with a pilot arc current in the range of 5-50 A and at plasma gas flow rates from 0.1 to 10 L/min.…”

“…Technological studies of the process of additive powder microplasma deposition of 3D objects were performed using the technological diagram, according to which the filler wire was fed into a constricted arc through the respective nozzle by the transporting gas flow [26].…”