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진동 유체 기반 실린더 기판 딥코팅을 통한 균일 두께 필름의제조 방법
이정락(Jeongrak Lee),곽현수(Hyunsu Kwak),조한성(Hanseong Jo),송유성(Yuseong Song),이안나(Anna Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We study the fabrication of uniformly thick films on cylinders by dip-coating with oscillation. In conventional dip-coating, whose physics was first investigated by Landau, Levich, and Derjaguin, a fast process generates a coating thickness gradient while a slow process limits the film thickness and is time-consuming. A new coating method of thick films was recently proposed, which involves dipping a solid substrate in a bi-layer liquid bath with neutral buoyancy and applying oscillation. In this study, we first experimentally and theoretically find how the film thickness profile is determined in the uniaxial coating. Then, we find the condition to achieve uniform thickness distribution along the circumferential direction in the biaxial coating. Applications of our results are not limited to areas where coating is widely used, such as solar cells or flexible displays; it can be used in the medical industry for efficiently fabricating functional catheters and vascular replicas.
이정락(Jeongrak Lee),곽현수(Hyunsu Kwak),이병호(Byungho Lee),이안나(Anna Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
This paper proposes a new manufacturing process of propellant controlling the regression rate through vibration-based multi-layer dip coating. This coating method can fabricate a uniform coating surface in a short period compared to a conventional dip coating that produces a non-uniform thickness due to gravity. Our developed propellant can prevent efficiency reduction of propulsion adding the different weight of a powder that affects the regression rate in a layer by layer. Thus, this study analysis factors depending on coating thickness by vibration-based dip coating. The coating thickness profile has an inverse relationship with the applied mechanical energy and is found to be independent of the dipping velocity at which the cylindrical substrate is immersed in a coating solution. Furthermore, the density and viscosity of an outer fluid interacting with the coating solution during a vibration affect the coating thickness at the area parallel to the direction of vibration.