CAJ | 학술논문

目的：了解等离子喷涂涂层过程中的晶须偏转行为,为提高涂层的抗冲蚀性能提供新思路。方法分别采用计算流体动力学软件FLUENT和有限元分析软件ANSYS,模拟研究等离子喷涂熔滴碰撞基体后的扁平过程,以及熔滴扁平期间晶须在力矩作用下的偏转行为。结果熔滴碰撞基体后,可以观察到熔滴的扁平化过程大约持续1.5μs。在力矩从1×10-18 N·m变化到3×10-18 N·m时,最大偏转角度从23°增长到70°。结论通过研究熔滴形状和最大扁平速度随时间的变化,得到了扁平化完成时间。熔滴沿基体表面的最大铺展速度与碰撞速度有关。当力矩在一定范围内改变时,晶须发生偏转。
목적：료해등리자분도도층과정중적정수편전행위,위제고도층적항충식성능제공신사로。방법분별채용계산류체동역학연건FLUENT화유한원분석연건ANSYS,모의연구등리자분도용적팽당기체후적편평과정,이급용적편평기간정수재력구작용하적편전행위。결과용적팽당기체후,가이관찰도용적적편평화과정대약지속1.5μs。재력구종1×10-18 N·m변화도3×10-18 N·m시,최대편전각도종23°증장도70°。결론통과연구용적형상화최대편평속도수시간적변화,득도료편평화완성시간。용적연기체표면적최대포전속도여팽당속도유관。당력구재일정범위내개변시,정수발생편전。
ABSTRACT:Objective To research the deflection of the whisker in the plasma sprayed alumina coatings, thus provide new ideas to enhance the erosion resistance. Methods The flattening of plasma sprayed droplets was simulated by FLUENT software after the droplets impacted on a flat substrate. And the deflection of whisker was characterized using ANSYS software during the flattening process of droplets. Results The flattening of droplets was observed after the impact which lasted about 1. 5 μs. When the momentshifted in the range of 1×10-18 to 3×10-18 N·m, the maximum deflection angle was increased from 23° to 70°. Conclusion The finish-time of flattening is obtained by studying the effect of impacting duration on the droplet shape and maximum flattening veloci-ty. The flattening velocity of droplet flow along the substrate surface is affected by the impact velocity. Deflection of whisker occurs when the moment is changed in certain range.