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EACVD법에 의한 고속도강에의 c-BN박막형성 및 특성에 관하여
이건영(Gun Young Lee),최진일(Jean Il Choe) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.3
The characteristic of interface layer and the effect of bias voltage on the microstructure of c-BN films were studied in the microwave plasma hot filament C.V.D process. c-BN films were deposited on a high speed steel(SKH-51) substrate by hot filament CVD technique assisted with a microwave plasma to develop a high performance of resistance coating tool. c-BN films were obtained at a gas pressure of 20 Torr, vias voltage of 300 V and substrate temperature of 800°C in B₂H?-NH₃-H₂ gas system. It was found that a thin layer of hexagonal boron nitride(h-BN) phase exists at the interface between c-BN layer and substrate.
EAHFCVD법에 의한 c-BN 박막형성기구와 계면층의 특성에 관하여
최용(Yong Choi),최진일(Jean I. Choe) 대한전기학회 2012 전기학회논문지 Vol.61 No.1
c-BN films were deposited on SKH-51 steels by electron assisted hot filament CVD method and microstructure development was studied processing parameters such as bias voltage, temperature, etching and phase transformation at boundary layer between BN compound and steel to develop a high performance wear resistance tools. A negative bias voltage higher than 200V at substrate temperature of 800℃ and gas pressure of 20 torr in B2H6-NH3-H2 gas system was one of optimum conditions to produce c-BN films on the SKH-51 steels. Thin layer of hexagonal boron nitride phase was observed at the interface between c-BN layer and substrate.
EA hot filament CVD system을 이용하여 금형공구강에 증착한 Ti(B,N)박막의 합성과 특성에 관하여
윤중현(Jung H. Yoon),최용(Yong Choi),최진일(Jean I. Choe) 대한전기학회 2012 전기학회논문지 Vol.61 No.4
The characteristics of interface layer and the effect of mole fraction of inlet gas mixture(B2H6/H2/N2/TiCl4) on the microstructure of Ti(B,N) films were studied by microwave plasma hot filament CVD process. Ti(B,N) films were deposited on a substrate(STD-61) to develop a high performance of resistance wear coating tool. Ti(B,N) films were obtained at a gas pressure of 1 torr, bias voltage of 300 V and substrate temperature of 480℃ in B2H6-H2-N2-TiCl4gas system. It was found that TiN, TiB2, TiB and hexagonal boron nitride(h-BN) phases exist in thin layer on the STD-61.
초음파분무열분해법에 의한 나노 텅스텐 분말의 형성 및 특성에 관하여
이호진(Ho Jin Lee),윤중현(Jung Hyun Yoon),최진일(Jean Il. Choe) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.4
Nanosize tungsten powder was synthesized by ultrasonic spray pyrolysis method through a solution containing ammonium metatungstate hydrate [(NH₄)?W₁₂O₃?ㆍH₂O] and reduction treatment. It was expected the improvement of mechanical properties due to increasing surface free energy and surface activity. Starting solutions with each concentration, reaction temperature and reduction treatment were significantly influenced on the formation of tungsten size and phase. It was found that particle size was decreased with concentration of starting solution and surface tension were decreased. The particle size was increased at thermal decomposition temperature above 600℃ by neck growth of interparticles. Tungsten particles were formed by reduction reaction in atmosphere of hydrogen gas at the temperature above 700℃.
崔鎭一 단국대학교 1993 論文集 Vol.27 No.-
The effect of Ti additions to molten borax have studied on the growth of intermetallic phase formed during electro-boronizing of the carbon steel and STS 430. The thickness of alloy layer was measured by an optical microscope and the structure was identified by X-ray diffractometer. The penetrated depth of the boron increased with addition of Ti but decreased above certain amount. The hardness and sliding wear resistance of carbon steel and STS 430 which penetrated deeply the diffused depth the boron as raising temperature and current density increased more remarkable than other surface treatment.