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고전류밀도 구리도금에서 첨가제에 따른 전기화학적 특성변화 연구
심진용,문윤성,이재호,Shim, Jin-Yong,Moon, Yun-Sung,Lee, Jae-Ho 한국마이크로전자및패키징학회 2011 마이크로전자 및 패키징학회지 Vol.18 No.2
The maximum current density of copper electrorefining is 350 A/$m^2$ and the higher current density is required to promote the copper productivity. The 1000 A/$m^2$ high current density is possible when rotating disc electrode is employed to reduce diffusion thickness. The copper electroplating with 1000 A/$m^2$ is possible at 400 rpm. Thiourea and glue were used to improve the electrodeposition behaviors during copper electrorefining process. Potentiodynamic polarization tests were conducted to investigate the effects of additives on copper electrodeposition. Galvanostatic tests were also conducted at 1000 A/$m^2$. Copper were electroplated on cylindrical rotating electrodes to give the uniform flow on the electrode surface. The lowest surface roughness was obtained when 16 ppm thiourea was added to the electrolytes. The surface roughness was increased with glue concentration. The surface hardness was not influenced by addition of glue. The copper nuclei were getting smaller with thiourea concentration, however there is no glue effects on copper nucleation.
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고전류밀도에서 첨가제에 따른 구리도급의 표면 특성 연구
심진용,문윤성,허기수,구연수,이재호,Shim, Jin-Yong,Moon, Yun-Sung,Hur, Ki-Su,Koo, Yeon-Soo,Lee, Jae-Ho 한국마이크로전자및패키징학회 2011 마이크로전자 및 패키징학회지 Vol.18 No.1
The current density in copper electroplating is directly related with the productivity and then to increase the productivity, the increase in current density is required. To obtain the high mass flow rate, rotating disk electrode(RDE) was employed. High rotational speed in RDE can increase the mass flow rate and then high speed electroplating was possible using RDE to control mass flow. Two types of cathode were used. One is RDE and another is rotating cylindrical electrode(RCE). A constant-current, constant-voltage and linear sweep voltammetry were applied to investigate current and voltage relationship. The maximum current density without evolution of hydrogen gas was increased with rotational speed. Over 400 rpm, maximum current density was higher than 1000 A/$m^2$. The diffusion coefficients of copper calculated from the slope of the plots are $5.5{\times}10^6\;cm^2\;s^{-1}$ at $25^{\circ}C$ and $10.5{\times}10^6\;cm^2\;s^{-1}$ at $62^{\circ}C$. The stable voltage without evolution of hydrogen gas was -0.05 V(vs Ag/AgCl). Additives were added to prevent dendritic growth on cathode deposits. The surface roughness was analyzed with UV-Vis Spectrophotometer. The reflectance of the copper surface over 600 nm was measured and was related with the surface roughness. As the surface roughness improved, the reflectance was also increased.
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엘보 파이프 내 개방형 와류기 날개 최적화를 통한 유동 혼합 개선
김현진,김호준,박종덕,심진용,이재성,유지호 한국유체기계학회 2025 한국유체기계학회 논문집 Vol.28 No.6
This study aims to enhance flow mixing in a 90° elbow pipe by suppressing Dean vortices through the optimization of the inlet and outlet blade angles of an open-type swirl generator. To evaluate the resulting flow characteristics, computational fluid dynamics (CFD) was carried out using the SST k-ω turbulence model. The inlet and outlet blade angles were treated as design variables and systematically optimized using the Surrogate Management Framework (SMF), with turbulent kinetic energy (TKE) and pressure drop serving as the primary performance metrics. Notably, TKE exhibited substantial variation—up to 26%— depending on the blade configuration, whereas pressure drop remained relatively stable, with a maximum variation of approximately 4.7%. Based on this observation, the optimization process focused solely on maximizing TKE, as the variation in pressure drop was relatively small and thus considered less critical. Additionally, the influence of the inlet and outlet angles on TKE and pressure drop was examined to clarify their roles in flow performance.
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