金属粉末气雾化技术研究新进展

The Study Progress of Metal Powder Gas Atomization Technology

气雾化制粉技术因粉末球形度高、气体杂质含量低等优点已经成为现在一种重要的粉末制备方法。雾化过程可粗略分为破碎和凝固两部分,涉及传热,物质交换以及多相流相互耦合等复杂现象。目前,人们对与雾化机理以及工艺参数的控制方法没有系统认识,制约了气雾化技术快速发展和工业化生产。本文简述了气雾化制粉中合金熔体的破碎行为机理,总结了最近几年关于气体流场结构、雾化工艺参数优化和计算流体力学在气雾化技术中的研究新进展,并且介绍了一些新技术在气雾化研究中的应用。

Gas atomization technology is currently one of the most important technologies to produce high quality metal and alloy powders with good spherical shape and low gas impurity.The atomization process can be roughly divided into two parts, namely break-up and solidification.However, the basic principle of atomization mechanism involves heat and mass transfer as well as the multiphase flow coupling. Inadequate understanding of these mechanisms and process parameters are the most important factors that restrict the development of gas atomization technology and industry application. This paper introduced several main gas atomization powder-making technologies and briefly described the mechanism of molten alloy break-up in gas atomization.Also, the new progress in the research of the gas flow field, atomization process parameters optimization and computational fluid dynamics as well as their applications in gas atomization on recent years are summarized.