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Linear Ion Source를 이용한 Anode Voltage 변화에 따른 DLC 박막특성
김왕렬(Wang Ryeol Kim),정우창(Uoo Chang Jung),조형호(Hyung Ho Jo),박민석(Min Suk Park),정원섭(Won Sub Chung) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.4
Diamond-like carbon(DLC) films were deposited by linear ion source(LIS)-physical vapor deposition method changing the anode voltages from 800V to 1800V , and characteristics of the films were investigated using residual stress tester, nano-indentation, micro raman spectroscopy, scratch tester and Field Emission Scanning Electron Microscope(FE-SEM). The results showed that the residual stress and hardness increased with increasing the ion energy up to anode voltage of 1400 V. It was also found that the content of SP³ carbon increased with increasing the anode voltage SP³/SP² ratio through investigation of SP³/SP² ratio by the micro-raman analysis. From these results, it can be concluded that the physical properties of DLC films such as residual stress and hardness are increased with increasing the anode voltage. These results can be explained that 3- dimensional cross-links between carbon atoms and Dangling bond are enhanced and the internal compressive stress also increased with increasing the anode voltage. The optimal anode voltage is considered to be around 1400 V in these experimental conditions.
정해창,김왕렬,정찬영,이정훈,Jung, Haechang,Kim, Wang Ryeol,Jeong, Chanyoung,Lee, Junghoon 한국표면공학회 2019 한국표면공학회지 Vol.52 No.1
Electrodeposited zinc layer is widely used as a sacrificial anode for a corrosion protection of steel. In this study, we modified the surface of electrodeposited zinc to have a hydrophobicity, which shows various advanced functionalities, such as anti-corrosion, anti-biofouling, anti-icing and self-cleaning, due to its repellency to liquids. Superhydrophobicity was realized on electrodeposited zinc layer with a hydrothermal treatment, creating nanostructures on the surface, and following Teflon coating. The superhydrophobic surface shows a great repellency to water with high surface tension, while liquid droplets with low surface tension easily adhered on the superhydrophobic surface. However, immiscible lubricant-impregnated superhydrophobic surface shows a great repellency to various liquids, regardless of their surface tension. Therefore, it is expected that the lubricant-impregnated surface can be an alternative of superhydrophobic surface, which have a drawback for some liquids with a low surface tension.
하이브리드 선형이온원에 의한 유압 기어펌프용 Cr-DLC코팅막의 특성과 효율성능
차순용,김왕렬,박민석,권세훈,정원섭,강명창,Cha, Sun-Yong,Kim, Wang-Ryeol,Park, Min-Suk,Kwon, Se-Hun,Chung, Won-Sub,Kang, Myung-Chang 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.6
This paper describes the results of the application of Cr-Diamond-like carbon (DLC) films for efficiency improvement through surface modification of spur gear parts in the hydraulic gear pump. Cr-DLC films were successfully deposited on SCM 415 substrates by a hybrid coating process using linear ion source (LIS) and magnetron sputtering method. The characteristics of the films were systematically investigated using FE-SEM, nano-indentation, sliding tester and AFM instrument. The microstructure of Cr-DLC films turned into the dense and fine grains with relatively preferred orientation. The thickness formed in our Cr buffer layer and DLC coating layer were obtained the 487 nm and $1.14\;{\mu}m$. The average friction coefficient of Cr-DLC films considerably decreased to 0.15 for 0.50 of uncoated SCM415 material. The hardness and surface roughness of Cr-DLC films were measured 20 GPa and 10.76 nm, respectively. And then, efficiency tests were performed on the hydraulic gear pump to investigate the efficiency performance of the Cr-DLC coated spur gear. The experimental results show that the volumetric and mechanical efficiency of hydraulic gear pump using the Cr-DLC spur gear were improved up to 2~5% and better efficiency improvement could be attributed to its excellent microstructure, higher hardness, and lower friction coefficient. This conclusion proves the feasibility in the efficiency improvement of hydraulic gear pump for industrial applications.
초고경도 Ti–Al–Si–N 나노복합체 코팅막의 미세구조 및 트라이볼로지 거동에 관한 연구
허성보(Sung-Bo Heo),김왕렬(Wang Ryeol Kim) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.5
In this study, the influence of silicon contents on the microstructure, mechanical and tribological properties of Ti–Al–Si–N coatings were systematically investigated for application of cutting tools. The composition of the Ti–Al–Si–N coatings were controlled by different combinations of TiAl₂ and Ti₄Si composite target powers using an arc ion plating technique in a reactive gas mixture of high purity Ar and N₂ during depositions. Ti–Al–Si–N films were nanocomposite consisting of nanosized (Ti,Al,Si)N crystallites embedded in an amorphous Si₃N₄/SiO₂ matrix. The instrumental analyses revealed that the synthesized Ti–Al–Si–N film with Si content of 5.63 at.% was a nanocomposites consisting of nano-sized crystallites (5–7 nm in dia.) and a three dimensional thin layer of amorphous Si₃N₄ phase. The hardness of the Ti–Al–Si–N coatings also exhibited the maximum hardness value of about 47 GPa at a silicon content of ~5.63 at.% due to the microstructural change to a nanocomposite as well as the solid-solution hardening. The coating has a low friction coefficient of 0.55 at room temperature against an Inconel alloy ball. These excellent mechanical and tribological properties of the Ti–Al–Si–N coatings could help to improve the performance of machining and cutting tool applications.