A rapid forming method and simulation on controllable-porosity coating  

作　　者：ZHANG HaiOu HU BangYou WANG GuiLan 

机构地区：[1]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　　处：《Science China(Technological Sciences)》2007年第6期786-796,共11页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 50474053, 50475134)

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.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.

关 键 词：plasma spray  porosity  SPRAY angle  POROUS material  functional GRADIENT MATERIAL 

分 类 号：N[自然科学总论]