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선택적 전기화학 3D 프린터 기술 소개 및 PCB 양산공정 적용방식 고찰
김성빈(Sung-Bin Kim),유봉영(Bongyoung Yoo) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.3
Some studies on electrochemical additive manufacturing of metals were summarized in this technical report, and development status of selective electrochemical 3D printing technology was introduced. In order to apply it to the PCB mass production process, essential considerations how to overcome the fundamental problems, such as the sizing, process sequence and PCB process design have been described.
선택적 금속 전착에 대한 전해질 온도 및 전류밀도 영향분석
박찬규,김성빈,김영국,유봉영,Park, Chan-Kyu,Kim, Sung-Bin,Kim, Young-Kuk,Yoo, Bongyoung 한국표면공학회 2018 한국표면공학회지 Vol.51 No.6
A metal 3D printer has been developed on its own to electrodeposit the localized area. Nozzles were used to selectively laminate the electrolytic plating method. To analyze the factors affecting the deposition, the stack height, thickness and surface roughness were experimentally analyzed according to the current density and the temperature of the electrolyte. Electrolytic temperature and current are electrodeposited when the deposition conditions are dominant over the etching conditions, but the thickness is kept constant. On the contrary, when the etching conditions are dominant, the electrodeposited shape is rather the etched. As a result, the uniformity of surface quality and electrodeposition rate could be improved by conducting experiments under constant conditions of electrolyte temperature and current density.
결정질 실리콘 태양전지의 효율개선을 위한 실리콘 역 피라미드 구조체 최적화
박진형(Jin Hyeong Park),남윤호(Yoon-Ho Nama),유봉영(Bongyoung Yoo),이정호(Jung-Ho Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
Antireflective pyramid arrays can be readily obtained via anisotropic etching in alkaline solution (KOH, NaOH), which is widely used in crystalline-Si (c-Si) solar cells. The periodic inverted pyramid arrays show even lower light reflectivity because of their superior light-trapping characteristics. Since this inverted pyramidal structures are mostly achieved using very complex techniques such as photolithograpy and laser processes requiring extra costs, here, we demonstrate the Cu-nanoparticle assisted chemical etching processes to make the inverted pyramidal arrays without the need of photolithography. We have mainly controlled the concentration of Cu(NO₃)₂, HF, H₂O₂ and temperature as well as time factors that affecting the reaction. Optimal inverted pyramid structure was obtained through reaction parameters control. The reflectance of inverted pyramid arrays showed < 10% over 400 to 1100 nm wavelength range while showing 15~20% in random pyramid arrays.
전기화학적 금속 3D 프린터의 적층 조건 연구를 통한 마이크로 코일 제작
김영국(Young-Kuk Kim),강동화(Donghwa Kang),김성빈(Sung-Bin Kim),유봉영(Bongyoung Yoo) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.4
In this study, we produced a coil of micro-pattern that can be used for electromagnetic wave absorber, heating material, wireless charging, sensor, antenna, etc. by using electrochemical additive manufacturing method. Currently, it contains research contents for manufacturing a micro pattern coil having practicality through control of process control variables such as applied voltage, distance between electrode, and nozzle injection. Circulation of the electrolyte through the nozzle injection control can significantly contribute to improving the surface characteristics of the coil because of minimizing voltage fluctuations that may occur during the additive manufacturing process. In addition, by applying the pulse method in the application of voltage, the lamination characteristics of the plated body were improved, which showed that the formation of a fine line width plays an important role in the production of a micro pattern coil. By applying the pulse signal to the voltage application, the additive manufacturing characteristics of the produced product were improved, and it was shown that the formation of a fine line width plays an important role in the production of a micro pattern coil.
전기 응고법을 이용한 커피박의 전처리 및 기능성 필터 특성 연구
박수빈(Soobin Park),한하늘(Haneul Han),박하늘(Haneul Park),임승현(Seunghyun Lim),유봉영(Bongyoung Yoo),윤상화(Sanghwa Yoon) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.4
As coffee consumption per person increases annually to 323 cups in 2018, treating the spent coffee ground has arisen because spent coffee ground results in soil and air pollution. The demands of air purification filters are increasing more and more because the air pollution due to the fine dust has become worse. The spent coffee grounds had a porous structure, however, the pore was blocked by organic oil compounds. Electrocoagulation, which is one of the electrochemical methods, has the potential to remove the organic compounds. The surface area of spent coffee grounds increased effectively after the electrocoagulation treatment, and surface morphology and surface area were confirmed using SEM and BET, respectively. Using the FT-IR, both the spent coffee grounds and the electrocoagulated spent coffee grounds were characterized. The filter characteristics were examined by the adsorption test using formaldehyde, one of the air pollutants.
다이아몬드 분말상에 무전해 Ni-B 도금을 위한 계면활성제의 영향
양창열(Changyol Yang),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),이정호(Jung-Ho Lee),유봉영(Bongyoung Yoo) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.3
The properties of electroless Ni-B thin film on diamond powder with different parameters (temperature, pH, surfactant etc.) were studied. The surface morphology, structure and composition distribution of the Ni-B film were observed by field effect scanning electron microscope (FE-SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD) and Auger electron spectroscopy (AES). The growth rate of Ni-B film was increased with increase of bath temperature. The B content in Ni-B film was reduced with increase of bath pH. As a result the structure of Ni-B film was changed from amorphous to crystalline structure. The PVP in solution plays multi-functional roles as a dispersant and a stabilizer. The Ni-B film deposited with adding 0.1 mM-PVP was strongly introduced an amorphous structure with higher B content (25 at.%). Also the crystallite size of Ni-B film was reduced from 12.7 nm to 5.4 nm.
다중벽 탄소나노튜브를 이용한 철근 부식 검출 센서 제작 연구
박수빈(Soobin Park),김성연(Sungyeon Kim),이수정(Sujeong Lee),최문정(Munjeong Choi),홍영준(Yeongjun Hong),권성준(Sungjun Kwon),유봉영(Bongyoung Yoo),윤상화(Sanghwa Yoon) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.4
In this study, rebar corrosion detection sensor was fabricated using multi-walled carbon nanotubes (MWCNTs). MWCNTs were pre-treated in the acid electrolytes to attach the carboxylic acid to the surface of MWCNTs. The fabricated sensor was attached on the surface of rebar and it detected the corrosion of steel using LCR meter with variation of capacitance. The surface morphology and electrical properties were characterized using scanning electron microscope (SEM) and electrical test equipment, respectively. To verify the corrosion detection characteristics, comparison experiment using plastic bar was performed. Moreover, mechanism of corrosion detection sensor was discussed.