Impact mechanism of gas temperature in metal powder production via gas atomization

doi:10.1088/1674-1056/abd75e

Abstract This paper aims at studying the influence mechanism of gas temperatures (300 K, 400 K, 500 K, and 600 K) on gas atomization by simulating the integral atomization process of the close-coupled nozzle in vacuum induction gas atomization (VIGA). The primary atomization is simulated by the volume of fluid (VOF) approach, and the second atomization is studied by the discrete phase model (DPM) combined with the instability breakage model. The results show that, at an increased gas temperature, the influences of gas-liquid contact angle and gas temperature in the recirculation zone on the primary atomization are virtually negligible. However, increasing the gas temperature will increase the gas-liquid relative velocity near the recirculation zone and decrease the melt film thickness, which are the main reasons for the reduced mass median diameter (MMD, d₅₀) of primary atomized droplets. During the secondary atomization, increasing the gas temperature from 300 K to 600 K results in an increase in the droplet dispersion angle, which is beneficial to the formation of spherical metal powder. In addition, increasing the gas temperature, the positive effect of gas-liquid relative velocity increase on droplets refinement overweighs the negative influence of the GMR decrease, resulting in the reduced MMD and diameter distribution interval. From the analysis of the atomization mechanism, the increase in atomization efficiency caused by increasing the temperature of the atomizing gas, including primary atomization and secondary atomization, is mainly due to the increase in the gas drag force difference between the inner and outer sides of the annular liquid film.

Keywords: metallic powders VIGA technology argon temperature two-phase flow

Received: 22 October 2020
Revised: 24 December 2020
Accepted manuscript online: 30 December 2020

PACS:	47.45.Ab	(Kinetic theory of gases)
	75.47.Np	(Metals and alloys)
	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	47.55.df	(Breakup and coalescence)

Fund: Project supported by the Open Fund of State Key Laboratory of Advanced Forming Technology and Equipment (Grant No. SKL2019006) and the National Natural Science Foundation of China (Grant No. 51975240).

Corresponding Authors: Miao-Hui Wang, Jing Li, Xue-Yuan Ge
E-mail: wangmh@camtc.com.cn;lijing2012@buaa.edu.cn;gexueyuan@163.com

Cite this article:

Peng Wang(汪鹏), Jing Li(李静), Xin Wang(王欣), Bo-Rui Du(杜博睿), Shi-Yuan Shen(申世远), Xue-Yuan Ge(葛学元), and Miao-Hui Wang(王淼辉) Impact mechanism of gas temperature in metal powder production via gas atomization 2021 Chin. Phys. B 30 054702

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