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나노 MgO-CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass 첨가제를 가진 AlN의 소결거동 및 열전도도
백수현,김경민,류성수,Baik, Su-Hyun,Kim, Kyung Min,Ryu, Sung-Soo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.5
In this study, $MgO-CaO-Al_2O_3-SiO_2$ (MCAS) nanocomposite glass powder having a mean particle size of 50 nm and a specific surface area of $40m^2/g$ is used as a sintering additive for AlN ceramics. Densification behaviors and thermal properties of AlN with 5 wt% MCAS nano-glass additive are investigated. Dilatometric analysis and isothermal sintering of AlN-5wt% MCAS compact demonstrates that the shrinkage of the AlN specimen increases significantly above $1,300^{\circ}C$ via liquid phase sintering of MCAS additive, and complete densification could be achieved after sintering at $1,600^{\circ}C$, which is a reduction in sintering temperature by $200^{\circ}C$ compared to conventional $AlN-Y_2O_3$ systems. The MCAS glass phase is satisfactorily distributed between AlN particles after sintering at $1,600^{\circ}C$, existing as an amorphous secondary phase. The AlN specimen attained a thermal conductivity of $82.6W/m{\cdot}K$ at $1,600^{\circ}C$.
MgO-CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass 첨가제 함량이 AlN의 물성에 미치는 영향
김경민,백수현,류성수,Kim, Kyung Min,Baik, Su-Hyun,Ryu, Sung-Soo 한국분말재료학회 (*구 분말야금학회) 2018 한국분말재료학회지 (KPMI) Vol.25 No.6
In this study, the effect of the content of $MgO-CaO-Al_2O_3-SiO_2$ (MCAS) glass additives on the properties of AlN ceramics is investigated. Dilatometric analysis and isothermal sintering for AlN compacts with MCAS contents varying between 5 and 20 wt% are carried out at temperatures ranging up to $1600^{\circ}C$. The results showed that the shrinkage of the AlN specimens increases with increasing MCAS content, and that full densification can be obtained irrespective of the MCAS content. Moreover, properties of the AlN-MCAS specimens such as microhardness, thermal conductivity, dielectric constant, and dielectric loss are analyzed. Microhardness and thermal conductivity decrease with increasing MCAS content. An acceptable candidate for AlN application is obtained: an AlN-MCAS composite with a thermal conductivity over $70W/m{\cdot}K$ and a dielectric loss tangent (tan ${\delta}$) below $0.6{\times}10^{-3}$, with up to 10 wt% MCAS content.
도시형자기부상철도 실시간 궤도선형 검측 장비 개발 연구
강흥식(Heung-Sik Kang),신병천(Byung-Chun Shin),백진기(Jin-gi Beak),이장열(Jang-yeol Lee),백수현(Su-hyun Baik),노명규(Myoung-gyu Noh) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
도시형자기부상열차는 궤도위를 부상하여 마찰력 없이 움직이는 열차로서 레일에 닿지 않고 지속적으로 열차를 부상시키기 위해 차량에 장착된 갭센서의 계측결과를 활용하여 부상력을 제어하며, 열차 주행시 가속도센서의 계측값을 활용하여 열차가 주행중에도 안정적으로 부상력을 유지하도록 제어시스템이 구성되어 있다. 이에 따라 본 연구에서는 자기부상열차가 가지고 있는 제어시스템의 특징을 활용하여 도시형자기부상철도 선로의 궤도선형을 실시간으로 분석하여 도시철도 운영시 중요한 궤도의 점검 및 유지보수를 빠르고 정확히 하기 위한 도시형자기부상열차용 궤도선형 검측장비를 개발하고자 한다. Urban Maglev is transport system that runs while floating on the rail by an electromagnetic force instead of wheel. The control technology is maintaining levitation with sensor over the tracks under any external condition. We want to develop equipment for verifying rail-state of urban maglev system with control system. The equipment confirms rail-state for rail maintenance.