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CNT 직경에 따른 CNT-Polyamide 복합체의 특성 변화
박영수(Y.S. Park),송준혁(S.J. Song),김경재(K.J. Kim),허몽영(H.M. Huh),유명한(M.H. Yoo),문민석(M.S. Moon),오제하(J.H. Oh),정우성(W.S. Jeong),강신재(S.J. Kang),양성모(S.M. Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The effect of CNT diameters on properties of CNT-polyamide composites were investigated such as electrical conductivity, tensile strength and thermal conductivity. To get different diameter distributions of CNTs, several portions of Mo and Fe in Mo-Fe/MgO catalysts were synthesized by a combustion method at 600℃. And all CNTs growed at 900℃ with 3 SLM methane and 1 SLM hydrogen for 40min. Four kinds of CNTs with different diameter distributions, such as 1~3㎚, 3~7㎚, 7~13㎚, and 10~30㎚, were selected to make CNT-polyamide composites. Each composite was manufactured by a solution mixing using bar-type ultra-sonicator in the CNT portions from 1phr to 50 phr. And electrical conductivity, tensile strength, and thermal conductivity were measured. Three properties of CNT-polyamide composite, manufactured with 10㎚ diameter, were more excellent compared to other composites, with electrical conductivity 10°Ω at 7phr, thermal conductivity 2.4.W/mK at 40phr, tensile strength 60㎫ at 30phr. CNTs with diameter 10㎚ were superior to other diameters for the multi-functional composite such as CNT-polyamide Composites.
최정식(J. S. Choi),김원태(W. T. Kim),오제하(J. H. Oh),강신재(S. J. Kang),노병준(B. J. Rho) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The Spray performance of a fuel injector have an important effect upon engine power and emission. This study discusses the spray behavior of an intermittent injection using a gasoline fuel injector. Image processing system and PDA system was utilized for the visualization of a spray behavior and the measurement of a fuel drop size and mean velocity. respectively. Fuel injection duration was fixed with 3ms and injection pressure was varied. As results. mean spray arrival time is linear increased with spray axis distance. Spray axis velocity linear correlate with fuel drop size in the time interval of an injected main spray.<br/>