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복합표면처리된 CrZrN 박막의 밀착력에 미치는 스퍼터링 효과에 관한 연구
김명근(M.K. Kim),김은영(E.Y. Kim),이상율(S.Y. Lee) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.6
In this study, effect of sputtering on the plasma-nitriding substrate and before PVD coating on the micros-tucture, microhardness, surface roughness and the adhesion strength of CrZrN thin films were investigated. Experimental results showed that this sputtering process not only removed surface compound layer which formed during a plasma nitriding process but also induced an alteration of the surface of plasma nitrided substrate in terms of microhardness distribution, surface roughness. This in turn affected the adhesion strength of PVD coatings. After sputtering, microhardness distribution showed general decrease and the surface roughness became increased slightly. The critical shear stress measured from the scratch test on the CrZrN coatings showed an approximately 1.4 times increase in the adhesion strength through the sputtering prior to the coating and this could be attributed to a complete removal of compound layer from the plasma nitrided surface and to an increase in the surface roughness after sputtering.
복합표면처리된 CrN박막의 밀착력에 미치는 스퍼터링 효과에 관한 연구
김명근(M.K. Kim),김은영(E.Y. Kim),김정택(J.T. Kim),이상율(S.Y. Lee) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.1
In this study, effect of sputtering after plasma nitriding and before PVD coating on the microstucture, microhardness, surface roughness and the adhesion strength of CrN thin films were investigated. Experimental results showed that this sputtering process not only removed surface compound layer which formed during a plasma nitriding process but also induced an alteration of the surface of plasma nitrided substrate in terms of microhardness distribution and surface roughness, which in turn affected the adhesion strength of PVD coatings. After sputtering, microhardness distribution showed general decrease and the surface roughness became increased slightly. The critical shear stress measured from the scratch test on the CrN coatings showed an approximately twice increase in the binding strength through the sputtering prior to the coating and this could be attributed to a complete removal of compound layer from the plasma nitrided surface and to an increase in the surface roughness after sputtering.
High-rate 마그네트론 스퍼터링을 이용한 오스테나이트 스테인리스강 박막 합성
이종훈,김광석,이상율,한상묵,한전건 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2
High-rate unbalanced magnetron sputtering process was employed to deposit a STS304 stainless steel film on S45C steel. The deposition of stainless steel film was carried out at a pressure of 2×10^(-3) torr, various target power densities, substrate bias voltages and distances of target-to-substrate. Deposition rate of the STS304 stainless steel films up to 1.3㎛/min could be obtained, but it decreased more rapidly by increasing target-to-substrate distance than by decreasing ion current. The results from XRD and EDS analysis showed that unbalanced magnetron sputtering of stainless steel target could successfully transfer the multi-element composition of the bulk material to the coating without any dramatic stoichiometric variation. SEM observation of STS304 film indicated that the structure of the film was a columnar structure(zone T structure) with a fine grain size. The Knoop hardness of coated STS304 film was measured to be approximately H_k800∼850 and this high value could be attributed to the fine grain size of the film and the residual compress stress on the film. The corrosion property of the film was evaluated using salt spray test and the results indicated that the corrosion property of stainless steel coated S45C steel was similar to that of the electroplated Cr coated S45C steel.
감마선을 이용한 소결 전 Fe/Ni 분말야금 판재의 밀도측정에 관한 연구
조경식,이종오,이상율,이주석 한국비파괴검사학회 1992 한국비파괴검사학회지 Vol.12 No.3
Accurate measurement of green density of compacted part in the powder metallurgy industry is rather fundamental but extremely important process that decide the quality of the sintered part. In case of green sheet P/M product, the green density as well as the distribution of the density must be examined for the same reasons. Currently in most cases, density measuring process is being performed applying conventional Archimedes principles. However this method is not only time-consuming but also often inaccurate because of the inherent nature of the process, such as part sectioning, closing of surface porosity with wax and weighing in air and in water. Therefore, it is necessary to develop a faster and more accurate method to measure the density of green sheet P/M product. In this work, a nondestructive density measurement device using gamma-ray absorption principles was constructed and the optimum condition for measuring green density of P/M sheet and its distribution was sought. The results showed that this method was very effective in terms of measuring time and accuracy.
30wt%Ag-36wt%Cu-32wt%Zn-2wt%Sn 브레이징 합금의 미세조직과 기계적 물성에 미치는 Ni 첨가의 영향
정재원,이상율,양성철 한국 항공대학교 항공산업기술연구소 2000 航空宇宙産業技術硏究所 硏究誌 Vol.10 No.-
본 연구의 목적은 Cd-free합금의 개발로, Ag-Cu-Zn-Sn기 브레이징 합금에 Ni을 첨가함에 따라 브레이징 합금에 조직적인 변화가 나타났다. Ag-Cu-Zn 기 브레이징 합금에 Cd 대신에 Ni첨가의 효과와 접합된 접합부의 미세조직은 EDS가 장착된 SEM과 XRD, DSC 등을 사용하여 분석하였다. Ni이 1∼2wt% 첨가된 브레이징 합금에서 Ni 함량의 증가에 따라 미소경도와 인장강도가 증가하였고, 가장 높은 인장강도는 Ni이 2wt% 첨가된 3076-2 합금으로 약 820 MPa 이었다. 브레이징은 850℃에서 15분간 대기중에서 노 브레이징 방법을 사용하여 실시하였고, 접합강도는 파괴 전단하중에 의해 측정하였다. 가장 높은 전단강도는 Ni이 2wt%첨가된 3076-2 합금에서 얻었으며, 258 MPa 이었다. The purpose of this study is to develope a Cd-free brazing filler metal. The microstructure of Ag-Cu-Zn-Sn based brazing alloy was affected by Ni addition. Effects of Ni addition replacing Cd in Ag-Cu-Zn based brazing alloy and microscope(SEM) equipped with energy-dispersive spectrometer(EDS). X-ray diffractometer(XRD) and differential scanning calorimetry(DSC). As Ni is added 1~2wt% in the brazing alloy, microhardness and tensile strength of brazing alloy increase with Ni contents. the maximum average tensile strength of 820 MPa has been obtained from the 3076-2 alloy which were added 2wt% Ni. Brazing is performed on the STS304/STS304 by furnace-brazing at 850℃ for 15min. Joint shear strength was determined by fracture shear loading and the brazed with 3076-2 alloy(2wt% Ni added) showed the highest shear strength of about 258 MPa.
Ti buffer layer를 갖는 TiN 박막의 합성과 특성 분석에 관한 연구
金廣碩,李商律,韓銓建 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6
Fracture resistance is one of the most important properties of TiN coatings for the wear application. Therefore, this study was focused on improving the fracture resistance of TiN films and a new structure TiN film with Ti/TiN/Ti buffer layer/TiN were made. These new type TiN films were synthesized by cathodic arc ion plating with various thicknesses of the Ti buffer layer. The structure and phase compositions of the films were examined by scanning electron microscopy(SEM), X-ray diffraction(XRD) and Auger electron spectroscopy(AES) and the mechanical properties were studied by a micro knoop hardness tester and an impact wear tester. The results from XRD analysis showed that the Ti interlayer between the substrate and the TiN layer has a preferred growth orientation of (111) but the internal Ti buffer layer within TiN film showed a preferred orientation of (002) plane, which matches with TiN (111) plane coherently, resulting in reduced possibility of failure between the Ti buffer layer and TiN layer. Microhardness of TiN film without the Ti butter layer was approximately Hk=2850 but in case of TiN films with the Ti butter layer, microhardness decreased slightly to approximately Hk=2300∼2800, depending upon the thickness of the Ti buffer layer. Results from the impact wear test showed that impact wear volume of the TiN film with Ti buffer layer decreased approximately three times than that of the TiN film without Ti buffer layer. This tendency could be attributed to the stress accumulation and relaxation at the soft Ti buffer layer.
고온 플라즈마 확산법을 이용한 내열화합물피막형성 및 고온 내마모성 향상에 관한 연구
한전건,김상식,김창우,이상율 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.2
Thermal resistant compound layer has been synthesized on hot working tool steel(SKD61) using plasma diffusion process a subsequent diffusion treatment after deposition. Ti and Al layers (Ti, Ti/Al and Ti/Al/Ti) were deposited on the steel substrate followed by diffusion-treatment with intense plasma heating through hollow cathode discharge effect at partial pressures of 1 torr to 2.5 torr of N₂ and H₂ mixture. Plasma diffusion at temperature range of 550℃ to 950℃ produced various intermetallic compounds of Fe₃Al and Fe₂Ti as well as nitride compounds of TiN and TiAlN at interface and surface. Compound formation enhanced surface hardness up to 3000Hk(0.1N). High temperature wear resistant also greatly increased at temperature range of 300℃ to 600℃ due to the thermal resistant compounds layer formation. Details of structure and high temperature wear behavior will be discussed with XRD, EDS and other analytical data.