TiAl合金粉末射频等离子体球化过程数值模拟

发布时间：2018-10-15 08:36

【摘要】：采用数值模拟的方法对TiAl合金粉末的射频(radio frequency)等离子体球化过程进行研究,分析速度场和温度场对不同粒径TiAl合金粉末的运动轨迹及质量变化的影响。结果表明:粉体颗粒在等离子体的高温作用下温度急剧升高,表面蒸发导致粒径降低,太小的颗粒很快蒸发消失掉;在冷却塔下端,不同粒径颗粒的运动轨迹存在较大差异,小颗粒倾向于随气流进入气流出口,大颗粒落到冷却塔底部被收集;增大气流量会提高球化系统中的气流速度,导致在气流出口能被气流带走的颗粒粒径变大,收粉率降低;模拟得到TiAl合金粉末球化后的粉末粒径分布、平均粒径及收粉率等参数与实验结果比较接近,模型能够较好地符合实际球化过程。
[Abstract]:The spheroidization process of TiAl alloy powder by RF (radio frequency) plasma was studied by numerical simulation. The effects of velocity field and temperature field on the movement track and mass change of TiAl alloy powder with different particle sizes were analyzed. The results show that the temperature of powder particles increases sharply under the action of plasma at high temperature, the surface evaporation results in a decrease of particle size, and the particles that are too small evaporate quickly, and at the lower end of the cooling tower, the movement trajectories of different particle sizes vary greatly. The small particles tend to flow into the air outlet and the large particles fall to the bottom of the cooling tower to be collected, and the increase of the gas flow rate will increase the velocity of the air in the spheroidizing system, resulting in the size of the particles that can be taken away by the air flow at the air flow outlet becomes larger, and the rate of pulverization decreases. The particle size distribution, average particle size and recovery rate of TiAl alloy powder after spheroidizing were similar to the experimental results, and the model could well conform to the actual spheroidization process.
【作者单位】：北京航空材料研究院;北京市先进钛合金精密成型工程技术研究中心;北京科技大学;
【基金】：装备预研基金(6140922020107)
【分类号】：TF123.23

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