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γ-Al₂O₃로부터 가역과정을 경유한 AlO(OH) 나노콜로이드의 합성
조현란,박병기,김숙현 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
The platelet AlO(OH) nano colloids were prepared by hydrothermal reaction of the γ-Al₂O₃ obtained with dehydration of γ-AlO(OH) and dilute CH₃COOH solution. In hydrothermal reaction process, reversible reaction was accompanied between γ-Al₂O₃ and AlO(OH), and hydrothermal reaction temperature, hydrothermal reaction time and CH₃COOH concentration had an effect on the crystal structure, surface chemical property, surface area, pore characteristics and crystal morphology of the AlO(OH) nano colloid particles. In this study, it was investigated to the hydrothermal reaction condition of the AlO(OH) nano colloid for using catalyst support, heat resisting agent, adsorbents, binder, polishing agent and coating agent. The crystal structure, surface area, pore volume and pore size of the platelet AlO(OH) nano colloids were investigated by XRD, TEM, TG/DTA, FT-IR and N₂ BET method in liquid nitrogen temperature.
γ-Al<sub>2</sub>O<sub>3</sub>로부터 가역과정을 경유한 AlO(OH) 나노콜로이드의 합성
조현란,김숙현,박병기,Cho, Hyun-Ran,Kim, Sook-Hyun,Park, Byung-Ki 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
The platelet AlO(OH) nano colloids were prepared by hydrothermal reaction of the $\gamma-Al_2O_3$ obtained with dehydration of $\gamma$-AlO(OH) and dilute $CH_3COOH$ solution. In hydrothermal reaction process, reversible reaction was accompanied between $\gamma-Al_2O_3$ and AlO(OH), and hydrothermal reaction temperature, hydrothermal reaction time and $CH_3COOH$ concentration had an effect on the crystal structure, surface chemical property, surface area, pore characteristics and crystal morphology of the AlO(OH) nano colloid particles. In this study, it was investigated to the hydrothermal reaction condition of the AlO(OH) nano colloid for using catalyst support, heat resisting agent, adsorbents, binder, polishing agent and coating agent. The crystal structure, surface area, pore volume and pore size of the platelet AlO(OH) nano colloids were investigated by XRD, TEM, TG/DTA, FT-IR and $N_2$ BET method in liquid nitrogen temperature.
γ-Al2O3로부터 가역과정을 경유한 AlO(OH) 나노콜로이드의 합성
조현란(Hyun Ran Cho),김숙현(Sook Hyun Kim),박병기(Byung Ki Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The platelet AlO(OH) nano colloids were prepared by hydrothermal reaction of the γ-Al₂0₃ obtained with dehydration of γ-AlO(OH) and dilute CH3COOH solution. In hydrothermal reaction process, reversible reaction was accompanied between γ-Al₂O₃ and AlO(OH), and hydrothermal reaction temperature, hydrothermal reaction time and CH₃COOH concentration had an effect on the crystal structure, surface chemical property, surface area, pore characteristics and crystal morphology of the AlO(OH) nano colloid particles. In this study, it was investigated to the hydrothermal reaction condition of the AlO(OH) nano colloid for using catalyst support, heat resisting agent, adsorbents, binder, polishing agent and coating agent. The crystal structure, surface area, pore volume and pore size of the platelet AlO(OH) nano colloids were investigated by XRD, TEM, TG/DTA, FT-IR and N₂ BET method in liquid nitrogen temperature.
조현란(Hyun Ran Cho),김숙현(Sook Hyun Kim),박병기(Byung Ki Park),전용식(Yong Sik Jeon),김동수(Dong Soo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The tempering and magnetic annealing are used to improve the soft magnetic properties such as initial permeability coercivity and core loss of the QMR5L alloy. The first heat treatment is performed at the temperature less than the curie temperature of the QMR5L alloy to remove the thermal stress for few hours in Ar gas atmosphere. The second stage heat treatment is performed the magnetic annealing at 500~800℃ for few hours in Ar gas atmosphere, and then quenching to room temperature in absence of oxygen. Finally, magnetic properties of the thermally treated QMRSL alloy are investigated for application as a soft magnetic material of the ISO solenoid valve core and plunger.