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김원기(W.G. Kim),김도영(D.Y. Kim),최한철(H.C. Choe) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.4
The dental orthodontic bracket requires good mechanical properties, such as elastic strength and frictional resistance, combined with a high resistance to corrosion. The objective of this study was to investigate the effects of TiN and ZrN coating on corrosion resistance of orthodontic brackets using various electrochemical methods. Brackets manufactured by Ormco Co. were used, respectively, for experiment. Ion plating was carried out for coatings of bracket using Ti and Zr coating materials with nitrogen gas. Ion plated surface of each specimen was observed with field emission scanning electron microscopy (FE-SEM), energy dispersive Xray spectroscopy (EDS) and electrochemical tester. The corrosion potential of the TiN and ZrN coated bracket was comparatively high. The current density of TiN and ZrN coated bracket was smaller than that of noncoated bracket in 0.9% NaCl solution. Pit nucleated at angle of bracket slot.
교정용 와이어의 표면특성에 미치는 TiN 및 ZrN 코팅영향
김원기(W.G. Kim),김도영(D.Y. Kim),최한철(H.C. Choe) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.4
The dental orthodontic wire provides a good combination of strength, corrosion resistance and moderate cost. The purpose of this study was to investigate the effects of TiN and ZrN coating on corrosion resistance and physical property of orthodontic wire using various instruments. Wires(round type and rectangular type) were used, respectively, for experiment. Ion plating was carried out for wire using Ti and Zr coating materials with nitrogen gas. Ion plated surface of each specimen was observed with field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), vickers hardness tester, and electrochemical tester. The surface of TiN and ZrN coated wire was more smooth than that of other kinds of non-coated wire. TiN and ZrN coated surface showed higher hardness than that of non-coated surface. The corrosion potential of the TiN coated wire was comparatively high. The current density of TiN coated wire was smaller than that of non-coated wire in 0.9% NaCl solution. Pit nucleated at scratch of wire. The pitting corrosion resistance ?Epit-Erep? increased in the order of ZrN coated (300 ㎷), TiN coated (120 ㎷) and non-coated wire (0 ㎷).
ZrN 및 TiN 코팅된 치과교정 용 미니나사의 표면특성과 전기화학적 거동
김신영(S. Y. Kim),문영필(Y. P. Moon),박근형(G. H. Park),조호형(H. H. Jo),김원기(W. G. Kim),손미경(M. K. Son),최한철(H. C. Choe) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.5
The dental orthodontic mini-screw requires good mechanical properties and high corrosion resistance for implantation in the bone. The purpose of this study was to investigate the electrochemical characteristics of TiN and ZrN coated orthodontic mini-screws, mini-screws were used for experiment. Ion plating was carried out for mini-screw using Ti and Zr coating materials with nitrogen gas. Ion plated surface of each specimen w as o bserved with f ield emission scanning e lectron microscopy ( FE-SEM), e nergy dispersive x -ray spectroscopy (EDX), and electrochemical tester. The surface of TiN and ZrN coated mini-screw were more smooth than that of other kinds of non-coated mini-screw due to dercrease of machined defects. The corrosion current density of the TiN and ZrN coated mini-screw decreased compared to non-coated sample. The corrosion potential of TiN and ZrN coated mini-screw were higher than that of non-coated mini-screw in 0.9% NaCl solution. The pitting corrosion resistance increased in the order of ZrN coated, TiN coated and non-coated wire. Pitting potential of ZrN coated mini-screw was the highest in the other specimens.
골아세포가 배양된 치과 임플란트용 Ti-Ta합금의 전기화학적 특성
김원기(W.G. Kim),최한철(H.C. Choe),고영무(Y.M. Ko) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.2
Electrochemical behaviors of surface modified and MC3T3-El cell cultured Ti-30Ta alloys have been investigated using various electrochemical methods. The Ti alloys containing Ta were melted by using a vacuum furnace and then homogenized for 6 hrs at 1000℃. MC3T3-El cell culture was performed with MC3T3-El mouse osteoblasts for 2 days. The microstructures and corrosion resistance were measured using FE-SEM, XRD, EIS and potentiodynamic test in artificial saliva solution at 36.5±1℃. Ti-Ta alloy showed the martensite structure of α+β phase and micro-structure was changed from lamellar structure to needle-like structure as Ta content increased. Corrosion resistance increased as Ta content increased. Corrosion resistance of cell cultured Ti- Ta alloy increased predominantly in compared with non cell cultured Ti- Ta alloy due to inhibition of the dissolution of metal ion by covered cell. RP value of MC3T3-El cell cultured Ti-40 Ta alloy showed 1.60×10? Ω㎠ which was higher than those of other Ti alloy. Polarization resistance of cell-cultured Ti-Ta alloy increased in compared with non-cell cultured Ti alloy.
어버트먼트 나사에 아-크 이온도금된 TiN과 ZrN피막의 부식특성과 표면 형상(2)
정용훈 ( Y H Jeong ),곽동묵 ( D M Kwag ),정재헌 ( C H Chung ),김원기 ( W G Kim ),최한철 ( H C Choi ) 한국부식방식학회(구 한국부식학회) 2011 Corrosion Science and Technology Vol.10 No.6
In this study, corrosion characteristics of TiN and ZrN film on the abutment screw by arc-ion plating were investigated using a potentiodynamic anodic polarization test in deaerated 0.9% NaCl solution at 36.5 ± 1 ℃. The surface morphologies of the coating layers before and after corrosion test were investigated by a field-emission scanning electron microscope (FE-SEM) and a energy dispersive x-ray spectroscopy (EDS). The surfaces of the TiN and ZrN coated abutment screws showed the smooth surfaces without mechanical defects like scratches which can be formed during the manufacturing process, compared with those of the non-coated abutment screw. The corrosion and passive current densities of TiN and ZrN coated abutment screws were lower than those of the non-coated abutment screw.
보철용 지르코니아 어버트먼트의 표면적합도와 전기화학적 거동
박근형(K.H. Park),정용훈(Y.H. Jeong),김원기(W.G. Kim),최한철(H.C. Choe),김명수(M.S. Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.1
The fit between dental implant fixture and zirconia abutment is affected by many variables during the fabrication process by CAD/CAM program and milling working. The purpose of this study was to evaluate the surface compatibility and electrochemical behaviors of zirconia abutment for prosthodontics. Zirconia abutments were prepared and fabricated using zirconia block and milling machine. For stabilization of zirconia abutments, sintering was carried out at 1500℉ for 7 hrs. The specimens were cut and polished for gap observation. The gap between dental implant fixture and zirconia abutment was observed using field-emission scanning electron microscopy (FE-SEM). The hardness and corrosion resistance of zirconia abutments were observed with vickers hardness tester and potentiostat. The gap between dental implant fixture and zirconia abutment was 5~12 ㎛ for small gap, and 40~60 ㎛ for large gap. The hardness of zirconia surface was 1275.5 Hv and showed micro-machined scratch on the surface. The corrosion potentials of zirconia abutment/fixture was ?290 ㎷ and metal abutment/fixture was ?280 ㎷, whereas |Epit?Ecorr| of zirconia abutment/fixture (172 ㎷) was higher than that of metal abutment/fixture (150 ㎷). The corrosion morphology of metal abutment/fixture showed the many pit on the surface in compared with zirconia abutment/fixture.