不同雾化压力下GH3536合金粉末制备和气雾化过程模拟  

Atomization simulation and preparation of GH3536 powders at different atomization pressures

作　　者：侯维强 吴佳欣 孟杰[1] 梁静静[1] 李金国[1] HOU Weiqiang;WU Jiaxin;MENG Jie;LIANG Jingjing;LI Jinguo(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;The Third Military Representative Office,Air Force Equipment in Shenyang,Shenyang 110014,China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]空装驻沈阳地区第三军事代表室,沈阳110144

出　　处：《粉末冶金技术》2023年第5期410-419,共10页Powder Metallurgy Technology

基　　金：国防基础科研计划资助项目(JCKY2020130C024)。

摘　　要：使用真空感应熔炼气体雾化方法,在不同雾化压力(7、8、9MPa)下制备了球形GH3536合金粉末。通过使用多相流模型和离散相模型对喷嘴下方区域进行了数值模拟,再现了不同雾化气压下的一次雾化和二次雾化过程。实验和模拟的结果表明:回流区的气体速度和滞止压力随雾化气压的提高而增加,雾化气压的增加使粉末粒度不断减小,模拟结果与实验结果吻合,验证了雾化模型的可靠性。提高雾化气压可提高细粉收得率,但颗粒尺寸的减小和颗粒形貌的改变会对粉末的流动性能造成直接影响,在雾化压力8MPa下制备的粉末具有最佳的流动性和松装密度,分别为14.34(s·50g^(-1))和4.728g·cm^(-3)。Spherical GH3536 alloy powders were prepared by vacuum induction.meling gas atomization method at the different atomization pressures(7,8,9 MPa).The region below the nozzle was numerically simulated by multiphase flow model and discrete phase model,and the primary and secondary atomization processes at the different atomization pressures were reproduced.In the results,the flow velocity and stagnation pressure in the recirculation zone increase with the increase of atomization pressure.With the increase of atomization pressure,the powder particle size decreases continuously.The simulation results are similar with the experimental results,verifying the reliability of the atomization model.The increase of atomization pressure can increase the yield of fine powders,but the decrease of particle size and the change of particle morphology may directly affect the powder flowability.The powders prepared at the atomization pressure of 8 MPa show the best flowability and the optimum apparent density,which are 14.34(s·50g^(-1))and 4.728 g·cm^(-3),rspectively.

关 键 词：高温合金粉末 气体雾化 雾化压力 数值模拟 粒度分布 

分 类 号：TF123[冶金工程—粉末冶金]