A rapid forming method and simulation on controllable-porosity coating
A rapid forming method and simulation on controllable-porosity coating作者机构：School of Mechanical Science & Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical Science & Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical Science & Engineering Huazhong University of Science and Technology Wuhan 430074 China
出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)
年 卷 期：2007年第50卷第6期
页 面：786-796页
核心收录：
基 金：Supported by the National Natural Science Foundation of China (Grant Nos. 50474053 50475134)
主 题：plasma spray, porosity, spray angle, porous material, functional gradient material
摘 要：A new method was introduced to fabricate porous coating and control its porosity by changing spray parameters. Two models were constructed to simulate the de- formation of droplet and the deposition process of splats on substrate. Considering the gap-pore, step-pore and shield-pore in the presented models, the influence of spray angle on the porosity of coating was mainly investigated. The simulation and experimental results show that the presented method is suitable for fabricating controllable-porosity coating. The porosity of coating can reach 49%. When the spray angle is lower than 30°, the porosity of coating rapidly increases because of shielding effect. Moreover, powder size and impact velocity also influence the po- rosity. Besides, a new forming method of graded porous coating was simulated by continuously changing the spray angle.
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