Three-dimensional transition map of flattening behavior in the thermal spray process
Three-dimensional transition map of flattening behavior in the thermal spray process
复制标题
DOI：
10.1351/pac200577020429
复制
发表时间：
2005-01
影响因子：
1.8
通讯作者：
M. Fukumoto;M. Shiiba;H. Kaji;T. Yasui
中科院分区：
文献类型：
--
作者：
M. Fukumoto;M. Shiiba;H. Kaji;T. Yasui
摘要采用等离子喷涂技术在镜面抛光的金属基体表面喷涂多种金属和陶瓷粉末颗粒，系统研究了基体温度和环境压力对颗粒扁平化行为的影响。在基体表面上的喷涂颗粒的平坦化行为中，在基体温度和环境压力中均识别出临界条件。也就是说，平坦化行为分别在临界温度和压力范围内发生过渡性变化。对于这些临界条件，我们分别定义并引入了转变温度Tt和转变压力Pt。从几个角度阐明了相关因素（如片状物底面的固化、吸附物在基底表面的脱附和界面润湿）对平坦化过程中转变行为的作用。转变温度和转变压力对喷涂颗粒材料的依赖性具有类似的趋势，这一事实表明，熔融颗粒对基底的润湿似乎是平坦化的主导因素。提出了一种结合相变温度和相变压力的三维相变图作为热喷涂过程的控制原理。
Abstract Many kinds of both metallic and ceramic powder particles were plasma-sprayed onto the mirror-polished metallic substrate surface, and the effect of both substrate temperature and ambient pressure on the flattening behavior of the particle was systematically investigated. In the flattening behavior of the sprayed particle onto the substrate surface, critical conditions were recognized both in the substrate temperature and ambient pressure. That is, the flattening behavior changed transitionally on that critical temperature and pressure range, respectively. We defined and introduced a transition temperature, Tt, and transition pressure, Pt, respectively, for those critical conditions. The role of the related factors (such as solidification of the bottom surface of the splat, desorption of adsorbates on the substrate surface and wetting at interface) on the transition behavior in the flattening was clarified from several points of views. The fact that the dependence both of transition temperature and transition pressure on the sprayed particle material had a similar tendency indicated that the wetting of the substrate by the molten particles seemed to be a domination in the flattening. A three-dimensional transition map by combining both transition temperature and transition pressure dependence was proposed as a controlling principle of the thermal spray process.