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Silica, Alumnia, Clay를 첨가한 지르콘의 소결특성에 미치는 영향
이근봉,정승화,이주성,홍경표,조범래,문종수,강종봉,Lee, Keun-Bong,Jung, Seung-Hwa,Lee, Ju-Sung,Hong, Gyung-Pyo,Jo, Bum-Rae,Moon, Jong-Su,Kang, Jong-Bong 한국재료학회 2008 한국재료학회지 Vol.18 No.7
Effect The effect of sintering additives ($SiO_2$, $Al_2O_3$, Clay) on the mechanical characteristics of sintered zircon was investigated. 1 vol% of additives in zircon powder was was sintered at $120{\sim}1500^{\circ}C$, the mechanical characteristics were measured, and microstructure analysis were was conducted. $Al_2O_3$ and clay additions increase the formation of monoclinic and tetragonal-$ZrO_2$ formation. An addition of SiO2 addition suppressed the formation of tetragonal-$ZrO_2$ formation., The A specimen sintered at $1400^{\circ}C$ showed the a density of $4.05\;g/cm^3$ and the a microhardness of 1120 HV, respectively.
이근봉,강종봉,Lee, Keun-Bong,Kang, Jong-Bong 한국재료학회 2008 한국재료학회지 Vol.18 No.11
The sintering behavior of zircon with silica was investigated. Zircon with 5 vol% of sedimentation $SiO_2$ resulted in the apparent density of $4.45\;g/cm^3$, the diametral tensile strength of $12.125\;kgf/cm^2$, and the micro Vickers hardness of 1283 HV. The dissociation temperature and mechanical characteristics of the $ZrSiO_4$ were changed with different kinds of $SiO_2$. $SiO_2$ addition prevented dissociation of $ZrSiO_4$. Zircon with 5 vol% of sedimentation $SiO_2$ and with 5 vol% of fused $SiO_2$ resulted in increased diametral tensile strength and increased micro Vickers hardness by suppression of $ZrSiO_4$ dissociation and low temperature liquid $SiO_2$ formation. Zircon with fumed $SiO_2$ and quartz $SiO_2$ resulted in decreased diametral tensile strength and decreased micro Vickers hardness because of cristobalite and quartz phase formation and high temperature liquid $SiO_2$ formation. Zircon with 10 vol% of $SiO_2$ resulted in decreased diametral tensile strength and decreased micro Vickers hardness because of weak particle coupling due to excess formation of liquid $SiO_2$.
Y<sub>2</sub>O<sub>3</sub> 및 La<sub>2</sub>O<sub>3</sub> 첨가가 알루미나의 소결거동에 미치는 영향
이근봉,강종봉,Lee, Keun Bong,Kang, Jong Bong 한국재료학회 2016 한국재료학회지 Vol.26 No.2
In this study, to increase the strength and enhance the sintering property of $Al_2O_3$, $Y_2O_3$ and $La_2O_3$ were added; the effects of these additions on the sintering characteristics of $Al_2O_3$ were observed. Adding 1% of $Y_2O_3$ to $Al_2O_3$ repressed the development of abnormal particles and reduced the grain boundary migration of $Al_2O_3$, curbing pores to capture particles; as such, the material showed a fine microstructure. But, when over 2% of $Y_2O_3$ was added, the sintering property was reduced because of abnormal particle grain growth and pore formation in particles. Adding 1% of $Y_2O_3$ and $La_2O_3$ to $Al_2O_3$ led to the development of abnormal particles and formed pores in the particles; when over 3% of $La_2O_3$ was added, the sintering property was reduced because the shape of the $Al_2O_3$ particles changed to angled plates.
공기 보조 분사 장치를 이용한 엔진 성능 향상 및 연비 개선
김세웅,심국상,이근봉 金烏工科大學校 1995 論文集 Vol.16 No.-
This paper describes the improvement of engine performence and fuel consumption through improved combustion formed by the tumble and swirl flows of an in-cylinder fuel-air mixture that uses an air forced fuel injector(AFI) which used compressed air. The AFI is designed to promote fuel atomization and to form uniform fuel-air mixture. In order to make up the tumble and the swirl flows of the in-cylinder mixture, the end of AFI is attached to the tube containing the fuel-air mixture to ensure the adequate flow and to ensure that the remaining kinds of mixture will flow effectively. In order to investigate the improvement of engine performence and fuel consumption, 2 models of tubes which make tumble and swirl flows were utilized. Each model was examined according to engine speed, intake manifold pressure and excess air ratio and compared with a base engine. Compared with the base engine, the results show that the AFI improves the engine performance and the brake specific fuel consumption(BSFC) in all of the engine speeds and the boost pressures at the tumble and the swirlflows. It also decreases exhaust emission of hydrocarbon(HC)
각속도 변동 지수와 크랭크각 지수를 이용한 가솔린 기관의 실화 검출
이근봉,김세웅,심국상 國立金烏工科大學校附設生産技術硏究所 1997 産業技術開發硏究 Vol.13 No.-
This paper introduces a diagnostic technique for the detection of faulty cylinders of internal combustion engines, using the indexes of the angular velocity variation and the crankshaft angle. Many types of faults may occur during the operation of internal combustion engines. These include low compression pressure, failure of ignition or combustion of malfunction of the fuel system. Early detection and correction of engine faults restore proper performance, improve engine efficiency and reduce costs. From the idea that the fluctuation of crankshaft speed contains the information of combustion phenomena, angular velocity variation is measured, with an interval timer and a magneric pick-up sensor, by timing the flywheel gear teeth as they pass the sensor. The angular velocity and angular acceleration are determined by cylinder pressure, load, inertia, and friction of the engine. The angular acceleration patterns, as well as the velocity patterns, are varied according to the relative effects between cylinder pressure and reciprocating inertia. Therefore the patterns are classified into three regions; the inertia dominant region, the combined region, the pressure dominant region. In this paper, misfire detection was investigated according to the regions with parameters defined for misfire detection. By this method, the single misfire or multiple misfires can be detected