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전일운(Zeon, Il-Woon),손기선(Sohn, Kee-Sun),박희동(Park, Hee-Dong) 대한화학회 2002 대한화학회지 Vol.46 No.1
조합화학 기법을 이용하여 청색 및 적색 발광을 하는 형광체를 합성하였다. 합성한 형광체에 대하여 254 nm 및 147 nm 여기 하에서의 발광 세기에 관한 라이브러리를 완성하였고, 또한 형광체의 결정성과 입자 현상은 XRD와 SEM으로 특성을 관찰하였다. 조합검색 결과로부터 형광체의 발광특성은 P 자리에 치환되는 금속이온의 영향을 많이 받았다. 결과적으로 형광체와 비교하여 발광 효율이 우수한 새로운 형광체를 찾아내었다. The blue and red emitting phosphors were prepared by the combinatorial chemistry method. The combinatorial library was designed to investigate the luminescence of the phosphors under 254 nm and 147 nm excitations. In addition, the crystallinity and morphology of phosphors were checked by XRD and SEM. Based on the results from the combinatorial screenings, luminescent properties of phosphors are strongly dependent on the concentration of doping metal ions. It was found that a new phosphor shows excellent luminescent efficiency comparing to the red phosphor.
SM45C 강의 narrow gap 용접부 회전굽힘 피로 특성
한승전 ( Seung Zeon Han ),안지혁 ( Jee Hyuk Ahn ),이재현 ( Je Hyun Lee ),김상식 ( Sang Shik Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.11
SM45C steel was welded by conventional CO2 arc and narrow gap welding (NGW). The fatigue strength of NGWed sample had a value about 90 MPa higher than that of the CO2 arc welded sample. The width of welding and heat affected zone in NGWed samples decreased about 40% compared to the conventional CO2 arc welded sample. The hardness value of the welding zone in the NGW sample was 33.3% higher than that of the CO2 arc welded sample. The microstructure change of the SM45C during NGW revealed that the matrix was transformed to the martensite phase. With the small width of welding and heat affected zone in the NGW, therefore, the specimen with NGW had a faster cooling rate after welding. We therefore concluded that the hardness was increased by hard martensite formation during cooling after NGW, and this increase in hardness resulted in better fatigue strength of SM45C steel compared to conventional CO2 arc welding. (Received March 13, 2014)