(1. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001；
2. 沈阳工业大学 材料科学与工程学院， 沈阳 110023)
摘 要: 在传统平面流铸技术的基础上，研究出一种新的金属粉末制取技术 改性平面流铸粉末化技术。 将改性平面流铸粉末化工艺过程分为平面液流的形成、平面液流的破碎和金属粉末的形成3个主要阶段，对这3个阶段建立了完整的数学模型，并对Sn60Pb40合金粉末化过程进行了数值计算。计算了平面液流形成过程动态熔潭中熔融金属液的温度场和流场，以及所得金属粉末的尺寸，计算结果与实验结果相吻合。考察了喷嘴几何尺寸、雾化室气氛气体密度等主要工艺参数对改性平面流铸粉末化工艺的影响。
关键字: 粉末冶金； 平面流铸； 金属雾化； 数学模型； 数值计算
modified planar flow casting atomization
（1. School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001， P.R.China;
2. School of Materials Science and Engineering,
Shenyang University of Technology, Shenyang 110023, P.R.China）
Abstract:Based on the traditional planar flow casting technique, a new powder process named modified planar flow casting atomization was developed. The whole atomization process can be divided into three main stages, namely, the formation of a thin liquid metal ribbon, the disintegration of the molten metal ribbon and the obtaining of metal powder. A complete mathematical model for these three stages was established, and numerical computation of the modified planar flow casting atomization process for Sn60Pb40 alloy was carried out. The flow field and temperature field of molten metal in the dynamic puddle between the nozzle and wheel gap were simulated during the course of liquid metal ribbon formation, and the sizes of metal powder produced were numerically computed. It was found that the computed results agreed well with the experimental ones. The effects of main technological parameters, such as nozzle size, air density in the atomization box, on the modified planar flow casting atomization process were discussed.
Key words: powder metallurgy; planar flow casting; metal atomization, mathematical model; numerical computation
