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저융점 합금(Bi58Sn42)을 이용한 Metal Mesh Touch Sensor용 Ag 페이스트의 전기적 특성
김태형(Tae-Hyung Kim),허영우(Young-Woo Heo),김정주(Jeong-Joo Kim),이준형(Joon-Hyung Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.6
In this study, a transient liquid phase sintering (TLPS) process of Ag pastes mixed with a fusible metal alloy of Bi58Sn42 with the melting temperature of 138℃, was examined. After screen printing of the Ag pastes with and without Bi58Sn42 powders on polyimide (PI) substrates, the electrodes were heat-treated at different temperatures in the range between 150 and 300℃ for 60 min in air. Comparing the electrical conductivity of the Ag pastes with and without Bi58Sn42 alloy powder after the heat treatment, it was manifested that the low melting temperature alloy definitely played a major role in an increased conductivity when it is added into the Ag pastes by providing more electrical conduction paths between Ag particles. This can be explained by the fact that capillary force of the melts of Bi58Sn42 can contribute to the rearrangement of the Ag particles during the heat-treatment inducing better connectivity between the Ag particles.
이호영,강보경,이호창,허영우,김정주,김재육,이준형,Lee, Ho-Young,Kang, Bo-Kyung,Lee, Ho-Chang,Heo, Young-Woo,Kim, Jeong-Joo,Kim, Jae-Yuk,Lee, Joon-Hyung 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.5
In the $(La_{0.8}Ca_{0.2})(Cr_{0.9}Co_{0.1})O_3$ (LCCC), which has been using as interconnector materials in SOFC, Al ions were substituted for Co because ionic radius of Al is similar to that of Co. Because of the almost identical ionic radius of Al and Co, the substitution was not thought to be affect the tolerance factor of LCCC, and the densification behavior, high temperature electrical conductivity and thermal expansion coefficient were examined as a function of Al concentration. In the cases of the x= 0 and x= 0.02 in $(La_{0.8}Ca_{0.2})(Cr_{0.9}Co_{0.1-x}Al_x)O_3$ (x= 0~0.1), the samples showed the relative densities above ${\geq}95%$ when those were sintered at ${\geq}1,350^{\circ}C$. In the case of the $x{\geq}0.06$ the sintered density deteriorated greatly at lower sintering temperatures. High temperature electrical conductivity of the samples decreased as the content of Al increased. Since the valence state of Al ion is unchangeable, while Cr or Co ions contribute to the electrical conduction by changing those valence states, Al substitution resulted in the decreased electrical conductivity. Al doping of LCCC was an effective way of decreasing the thermal expansion coefficient (TEC).
열처리 조건에 따른 Tb이온의 확산 및 Nd-Fe-B 자석의 자기적 특성
오성욱,김동환,공군승,허영우,김정주,이준형,Oh, Seong-Uk,Kim, Dong-Whan,Gong, Gun-Seung,Heo, Young-Woo,Kim, Jeong-Joo,Lee, Joon-Hyung 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
In this study, the effect of Tb inward diffusion on the magnetic properties of the Nd-Fe-B sintered magnets was studied. After sintering of the magnets, $TbF_3$ slurries were dip-coated on the surface of the samples, then heat-treatment was followed for $TbF_3$ diffusion. The element distribution in the magnets and the diffusion profiles of Tb ions were analyzed by an EPMA (electron probe micro-analyzer). Prolonged heat treatment resulted in a deeper diffusion length of Tb ions. Coercivity of the $1^{st}$ heat-treated sample showed 21.86 kOe, while that of the $1^{st}$, $2^{nd}$ heat-treated and annealed sample revealed 34 kOe.
이호창,강보경,이준형,허영우,김재육,김정주,Lee, Ho-Chang,Kang, Bo-Kyung,Lee, Joon-Hyung,Heo, Young-Woo,Kim, Jae-Yuk,Kim, Jeong-Joo 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
In this study, in order to improve densification of $La_{0.8}Ca_{0.2}Cr_{0.9}Co_{0.1}O_{3-\delta}$ (LCCC), which is known for one of the most proper candidate interconnector materials in the solid oxide fuel cells, $CaCrO_4$ was prepared via solid oxide synthesis route and added to the LCCC with different amount and particle sizes. As the amount of the $CaCrO_4$ increased, porosity of the sintered samples increased, and the pore size was proportional to the particle size of the $CaCrO_4$. This supports the fact that the $CaCrO_4$ phase forms liquid during sintering and permeate into the matrix leaving behind large pores. Then the liquid reacts with the matrix through the solid solution. However, when the samples were sintered with a slow ramp up rates, the porosity decreased. This is thought to be caused by the progressive solid solution of $CaCrO_4$ before the temperature reach to the melting temperature and forms a fluent amount of liquids. The sintering behavior of the LCCC with the addition of $CaCrO_4$ was analyzed through the transient liquid phase sintering on the basis of the microstructure observation and phase identification by x-ray diffraction.