Abstract

Spheroidization of Fe and steel powders in a plasma stream of an DC arc plasma torch is investigated. The possibility of obtaining a product with a spherical particle content of up to 100% is established. The fluidity of the best samples of obtained powder is 13–20 s with a fluidity of the feedstock of 39 s. The bulk density of the initial powder (3.05 g/cm³) during the plasma treatment increases to 4.1–4.4 g/cm³. The nanofraction content in spheroidized powders varied from 0 to 75 wt % and it depends mainly on the enthalpy of the plasma stream, consumption of raw materials, and the organization of the flow of the plasma-forming gas in the discharge channel of the plasma torch. It is established that Fe powders spheroidized in plasma can be used in selective laser melting technology to obtain compact samples whose density reaches 7.86 g/cm³.

中文翻译：

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直流电弧等离子体炬等离子流中铁基粉末的球形化及其在选择性激光熔化中的应用

摘要

研究了在直流电弧等离子炬的等离子流中铁和钢粉的球化作用。建立了获得球形颗粒含量最高为100％的产品的可能性。获得的最佳粉末样品的流动性为13–20 s，进料的流动性为39 s。在等离子处理期间，初始粉末的堆积密度（3.05 g / cm ³）增加到4.1–4.4 g / cm ³。球形粉末中的纳米级分含量从0到75 wt％不等，这主要取决于等离子流的焓，原料的消耗以及等离子炬放电通道中等离子形成气体的流动组织。 。建立了在等离子体中球化的铁粉可用于选择性激光熔化技术，以获得密度达到7.86 g / cm ^3的致密样品。