Abstract：Effects of the liquid guide tube pressure （the pressure of liquid guide tube tip，[PT）]on the atomization rate （the mass of the molten metal atomized per minute，[RA）]and the physical properties of the powders during vacuum gas atomization process were investigated. The results show that， in the case of other process parameters remain unchanged， the atomization rate decreases and the adhesion of the “satellite ball” reduces effectively with the decrease of the guide tube pressure， and the loose density and fluidity of the powder improve. However， the too low pressure of the guide tube makes the atomization rate too low， and the loose density and fluidity of the powder become worse. Therefore， there is an optimum pressure value of the guide tube during the vacuum gas atomization process.
[1] Ting J，Peretti M W，Eisen W B．The effect of wake-closure phenomenon on gas atomization performance [J]．Materials Science and Engineering，2002，326：110-121．[2] Udo F, Volker U. Hybrid gas atomization for powder production [J]. Powder Metallurgy, 2011, 99- 122[3] Wenjun Z, Fuyang C, Zhiliang N, etc. A computational fliud dynamics (CFD) investigation of the flow field and the primary atomization of the close coupled atomizer. Computers and Chemical Engineering, 2012, 40, 58-66.[4] 吕洪．固体雾化原理及工艺规律的研究．湖南长沙：中南大学，2003：1．20．[5] 欧阳鸿武，陈欣，余文焘，等．气雾化制粉技术发展历程及展望．粉末冶金技术，2007，25(1)：53-63．[6] 陈仕奇，黄伯云．金属粉末气体雾化制备技术的研究现状与进展．粉末冶金技术，2004，22(5)：297-302．[7] 赵新明，徐骏，朱学新，等．气体压强对超音速气雾化中气体流场的影响。中国科学E辑：技术科学，2009，9(39)：1582-1588．
2018, Vol. 28 
