张勇,徐建宁,郭龙龙,鞠录岩

• 1:西安石油大学机械工程学院

摘要(Abstract)：

在等离子喷涂多物理场耦合的基础上考虑了颗粒所受的热泳力和压力梯度力,对超音速等离子喷涂过程中颗粒运动的特性进行研究,利用SprayWatch-2i对飞行颗粒进行在线监测并与计算值进行对比。结果显示:距喷嘴出口90～100 mm时,颗粒的温度和速度最高,是超音速等离子喷涂的最佳喷涂距离。在0.4 ms时,颗粒中心最低温度达到3000 K,已高于8YSZ的熔点,在这个时候颗粒已经完全熔化。颗粒在等离子射流中发生细化,在距离喷嘴出口100 mm处直径小于5μm的颗粒所占比例超过了50%,颗粒主要发生的是振动破碎。实验验证了超音速等离子喷涂数值模拟的正确性,小直径颗粒的计算值更接近实验值。

关键词(KeyWords)： 超音速等离子喷涂;颗粒;熔化;细化

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 张勇,徐建宁,郭龙龙,鞠录岩

DOI: 10.13289/j.issn.1009-6264.2018-0422

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