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습식 Cr도금 대체를 위한 CrN박막의 내마모성 및 내식성 향상에 관한 연구
김상식(Sang S.Kim),김갑석(Kab S.Kim),한전건(Jeon G.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
CrN hard coating becomes one of the attractive protective films for enhancement of wear and corrosion resistance due to its superior properties. In addition, the noted property of CrN coating is the excellent corrosion resistance. Therefore CrN coating has a strong potential to replace the electro-deposited hard chrome coating which generates serious environmental pollution problem at present in the world. In this study, CrN film was deposited on S45C by cathodic arc ion plating process. The deposition of CrN laver was carried out at the various N₂ partial pressure of 5×10^-3 torr to 2×10^-2 torr under the bias voltage of -200V. All the coated specimens were analyzed by XRD and SEM for structural characterization and the wear and corrosion behaviors were compared with those of hard Cr coated specimens y ball-on-disc wear test and electrochemical polarization measurement.<br/> The CrN coating deposited at 1×10^-2 torr showed the highest CrN(220) intensity and a maximum hardness of Hk 2700 which is twice of that of the hard Cr coating. The wear resistance of CrN coated S45C against Al₂O₃ and AISI 52100 steel balls was highly improved compared to that of the hard Cr coating. The CrN coatings also enhanced the resistance of pitting and crevice corrosion. This improvement was associated with the formation of the CrN coatings with dense and fine granular structures without microcrack which exists in all the electroplated hard Cr coating.<br/>
습식 Cr 도금 대체를 위한 CrNx 박막의 내마모성 및 내식성 향상에 관한 연구
김상식,한전건 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.3
CrN_x film was deposited on S45C by cathodic arc ion plating process. The deposition of CrN_x layer was carried out at the various N₂ partial pressure of 8×10^(-4) torr to 2×10^(-2) torr under the bias voltage of -200V. All the coated specimens were analyzed by XRD and SEM for structural characterization and the wear and corrosion behavior was compared with that of hard Cr coated specimens by ball-on-disc wear test and electrochemical polarization measurement. The CrN_x coatings at all deposition conditions appeared to be very dense and fine granular structure. The CrN_x coating deposited at 1×10^(-2) torr showed the highest CrN(220) intensity and a maximum hardness of Hk 2700 which is twice of that of the hard Cr coating. The wear resistance of CrN_x coated S45C against AISI 52100 steel balls was highly improved compared to that of the hard Cr coating. The CrN_x coatings also enhanced the resistance of pitting and crevice corrosion. This improvement was associated with the formation of the CrN_x coatings with dense and fine granular structures without microcrack which exists in all the electroplated hard Cr coating.
Bias Voltage 에 따른 WC 박막의 형성거동 및 밀착력 향상에 관한 연구
김상식,한전건,명현식 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
WC mono- and multilayer films were deposited on STD61 and cemented carbide substrates by Cathodic Arc Ion Plating process in various bias voltages of 0V to 200V. Chemical compositions and deposition rates were investigated using Energy Dispersive Spectroscopy(EDS) and Scanning Electron Microscopy(SEM). Microstructures of WC films were analysed by X-ray Diffractometer(XRD). The adhesion and microhardness were evaluated by Rockwell-C indentation test method, Scratch test and Microknoop hardness test. The films were formed in a mixture of α-W₂C(hexagonal structure) and β-WC(B1 NaCl structure) phase and the preferential orientation of β-WC have been changed from [311] to [220] with increasing bias voltage. The microhardness of the deposited WC films on cemented carbide were evaluated up to Hk3000 and WC multilayer films exhibited good adhesion in Rockwell-C indentation test and Scratch test.
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.