不同基底上等离子喷涂钼层片形成过程的三维模拟

发布时间：2019-04-04 12:01

【摘要】：基于有限体积法,运用流体体积法(VOF)追踪自由液面,同时考虑流动、传热和基底熔化的耦合,对在1Cr13不锈钢和H70黄铜基底上等离子喷涂钼层片的形成过程进行了三维瞬态模拟;通过等离子喷涂试验制备了钼层片,利用扫描电子显微镜和台阶仪分别测试了钼层片的形貌和表面轮廓曲线,并将试验结果与模拟结果进行了对比验证。结果表明:在两种基底上模拟得到的钼层片形貌、厚度、铺展系数以及基底撞击凹坑深度都与试验结果吻合较好;1Cr13不锈钢基底上钼层片发生飞溅是由于钼熔滴在铺展过程中受到已凝固薄层的阻碍而抬离基底,进而脱离已凝固层而形成的。
[Abstract]:Based on the finite volume method (FVM), the fluid volume method (VOF) is used to trace the free liquid surface, taking into account the coupling of flow, heat transfer and substrate melting. The formation process of plasma sprayed molybdenum laminate on 1Cr13 stainless steel and H70 brass substrate was simulated by three-dimensional transient method. Molybdenum laminate was prepared by plasma spraying test. The morphology and surface profile curve of molybdenum laminate were measured by scanning electron microscope (SEM) and step instrument, and the experimental results were compared with the simulated results. The results show that the morphology, thickness, spreading coefficient and impact pit depth of molybdenum laminate simulated on two kinds of substrates are in good agreement with the experimental results. The spatter of molybdenum lamellae on 1Cr13 stainless steel substrate is caused by Mo melt droplets being obstructed by solidified thin layer in spreading process, which is carried away from the substrate and then separated from the solidified layer.
【作者单位】：福州大学材料科学与工程学院;
【分类号】：TG174.44

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