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안병건,추관식,문두수,안정식,김영대,김형자,이규용 釜慶大學校 2002 釜慶大學校 論文集 Vol.7 No.-
Low energy high current N_2 ion beam was used to modify the morphology and chemical composition of cemented carbide WC-Co(Co:10 wt%, TiC + TaC:15 wt%, WC:bal) hard material surface for the fabrication of the TiN thin film by sol-gel method. The effects of ion beam treatment on preparation of the TiN thin film by sol-gel mothod were investigated by XPS, SEM, AFM and GXRD. According to the N_2 ion beam bombardment, the surface roughness was increased and TiC binders in WC were dissolved. The dissolved Ti was recombind with nitrogen ion to form the TiN nucleuses which were acted as seeds for the forming of the TiN thin film on the cemented WC-Co surface. Besides, the sputter deposited Ti interlayer prevented the diffusion of TiO_2 sol into the porous WC-Co during the formation of TiN thin film.
탄소나노튜브의 분산이 탄소나노튜브 캐소드의 전계방출 특성에 미치는 영향
안병건,성명석,신허영,김동희,김태식,조영래,Ahn B. G.,Seung M. S.,Shin H. Y.,Kim D. H.,Kim T. S.,Cho Y. R. 한국재료학회 2004 한국재료학회지 Vol.14 No.11
The uniformity of emission mage and field emission properties of carbon nanotube(CNT) cathodes dependence on CNT particle dispersion were investigated for field emission displays. We used multi-walled carbon nanotubes (MWNTs) synthesized by CVD method as the field emitter materials. CNT dispersion in CNT ink was carried out by ultrasonication and shaking methods. According to CNT dispersion conditions, the uniformity of emission image and field emission properties of CNT cathodes were greatly affected. The smaller particles of filler materials and CNT powders provide the better properties of the CNT cathodes.
섬유기기용 Al₂O₃계 세라믹스의 균열치유거동과 균열치유재의 강도특성
안병건(B. G. Ahn),김미경(M. K. Kim),김현수(H. S. Kim),안석환(S. H. Ahn),김진욱(J. W. Kim),남기우(K. W. Nam) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Alumina ceramic for textile machinery was sintered and subjected to three-point bending. A semicircular surface crack was made on each sample. Crack-healing behavior was systematically studied, as a function of crack-healing temperature, crack size. The bending strength and fracture toughness of the crack-healed sample from 1200℃ to 1400℃ was investigated. A statistical approach based on Weibull distribution was applied to the test data to evaluate the dispersion in the fracture toughness. Alumina ceramic for textile machinery have the ability to heal after cracking, from over 1300℃. The material can completely heal a 65 ㎛ diameter semielliptical crack. The fracture toughness could be explained by 2-parameter Weibull distribution.