气体雾化制粉技术研究综述  

A review of research on powder prepared by gas atomization

作　　者：张雪良 陶宇[1,2] 贾建 曲敬龙[1,2] ZHANG Xueliang;TAO Yu;JIA Jian;QU Jinglong(High Temperature Materials Research Institute,Center Iron and Steel Research Institute Co.,Ltd,Beijing 100081,China;GAONA Aero Material Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司高温材料研究所,北京100081 [2]北京钢研高纳科技股份有限公司,北京100081

出　　处：《粉末冶金工业》2022年第3期96-106,共11页Powder Metallurgy Industry

基　　金：国防基础科研项目(JKCY2020512C001);国家科技重大专项资助项目(2017-VI-0008-0078)。

摘　　要：气体雾化法制备的金属粉末具有粒度细小、球形度好、纯净度高的特点。近年来,随着3D打印技术的发展,气体雾化制粉技术受到广泛关注。总结了目前国内外对气体雾化制粉技术的研究进展,主要包括雾化工艺参数对粉末特性的影响以及气体雾化制粉过程中单相气体流场结构、高温熔体初次破碎过程和熔滴二次破碎过程的模拟仿真。The research progress of gas atomization technology at home and abroad was summarized, including the influence of gas atomization parameters on the powder characteristics, the numerical simulation of gas flow structure, primary breakup of high-temperature melt and secondary breakup of droplets during gas atomization to provide some references for the further improvement of gas atomization technology. The quality of powder is related to the parameters of gas atomization. In a certain range, both increasing gas pressure, gas temperature, melt superheat and decresing melt diameter, melt flow rate will cause the power size decrease and improve the yeild rate of fine powder. The dynamic energy of atomization gas can be increased with increasing gas pressure and temperature, which is benefit for the melt breakup. Meanwhile, increasing the melt superheat will make the viscosity and surface tension of melt decrease, which will also promote the melt breakup. The gas atomization process is too complex to analyze through the ordinary experimental methods, so numerical simulation becomes an important way to describe the gas flow field, primary breakup of melt and secondary breakup of droplets during gas atomization process. The simulation results indicate that the gas flow field is consisted of a series of“Prandtl Meyer”waves, forming a“necklace-like”structure. The primary breakup of melt is mainly simulated by VOF(volume of fraction) model. And the secondary breakup of droplets is well described using DPM(discrete phase model) modle and the instability model of melt such as TAB model, KH model and KHRT model. Particle size distribution and particle morphology are closely related to the parameters of gas atomization such as gas pressure, gas temperature,melt superheat and melt flow rate. Selecting reasonable atomization parameter is the basis for preparing spherical powder with high quality. At present, the research on the gas atomization process, including the gas flow field, primary breakup of melt and secondary br

关 键 词：气体雾化 粉末 雾化工艺 初次破碎 二次破碎 数值模拟 

分 类 号：TF123.112[冶金工程—粉末冶金]