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RISS 인기검색어
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- 저자 : 정구은(Goo Eun Jung) (검색결과 4 건)
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공침법에 의한 Ni-Zn Ferrite의 제조 및 물성연구
정구은,고재귀,Jung Goo Eun,Koh Jae Gui 한국재료학회 2004 한국재료학회지 Vol.14 No.5
Ni-Zn ferrite powder was obtained by wet method that was to be coprecipitated the metal nitrates, Fe($NO_3$)$_3$ㆍ$9H_2$O, Ni($NO_3$)$_2$ㆍ$6H_2$O, Zn($NO_3$)$_2$ㆍ$6H_2$O to make a high permeability material. The composition of the ferrite powder was $Fe_2$$O_3$ 52 mol%, NiO 14.4 mol%, ZnO 33.6 mol%. Ni-Zn ferrite powder was compounded by precipitating metal nitrates with NaOH in vessel at the synthetic temperature of $90^{\circ}C$ for 8 hours. Calcination temperature and sintering temperature were $700^{\circ}C$ and $1150^{\circ}C$~$1250^{\circ}C$, respectively, for 2 hours. And the other ferrite powder was also prepared by the wet ball milling that was to be mixed the metal oxides as same as the above chemical composition. We studied the properties of the powder and the electromagnetic characteristics of the sintered cores obtained from there two different processes. Wet direct process produced smaller particle size with narrower distribution of the size and more purified ferrite whose sintered cores had high permeability and high magnetization.
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정구은,강세종,Jung, Goo-Eun,Kahng, Se-Jong 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.5
신뢰도 높은 나노 직선 이동장치를 제작하였다. 장치는 기본 몸체에 고정된 6개의 피에조 다리들과 이들이 붙잡고 있는 사파이어 육각기둥으로 이루어 졌다. 특정한 전압파형을 피에조 다리에 인가하여 피에조 다리를 순차적으로 움직임으로 육각기둥을 앞으로 혹은 뒤로 움직인다. 직선 이동장치를 지표면에 수직 방향으로 시험구동 하였다. 육각기둥이 수 mm를 움직이는 동안 속도가 일정함을 확인하였다. 위쪽으로 올라가는 가장 느린 속도는 $1.7{\times}10^{-6}m/s$, 즉 ${\sim}28.3nm$/걸음이었고 아래쪽으로 내려가는 가장 느린 속도는 중력의 도움을 받아 ${\sim}3.7{\times}10^{-6}m/s$, 즉 ${\sim}61.7nm$/걸음 이었다. 피에조에 인가된 전압을 증가시키면 육각기둥의 이동속도가 선형으로 증가하였다. 이 직선 이동장치를 주사형 터널링 현미경의 접근 장치로 사용할 것이다. A reliable linear translation system was constructed. The system has six piezo legs, attached to a main body, holding a hexagonal sapphire rod. The sapphire rod moves either forward or backward with the sequential motion of the piezo legs, driven by characteristic electric voltage waves. The translational system was tested in vertical direction. The speed of the sapphire rod was turned out to be constant during several mm travel. The slowest upward speed was measured to be ${\sim}1.7{\times}10^{-6}m/s$, yielding ${\sim}28.3nm/step$, while the slowest upward speed was ${\sim}3.7{\times}10^{-6}m/s$, with ${\sim}61.7nm/step$, due to gravitational force. The velocity increases linearly, as the amplitude of the voltage waves increases. The linear translation system will be used as a coarse approach part for a scanning tunneling microscope.
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습식합성법을 이용한 Ni - Zn Ferrite의 제조 및 전자기적 특성연구
정구은(Goo Eun Jung),고재귀(Jae Gui Koh) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.1
Ni-Zn ferrite powder was synthesized from metal nitrates, Fe(NO₃)₃ㆍ9H₂O, Ni(NO₃)₂ㆍ6H₂O, Zn(NO₃)₂ㆍ6H₂O by wet direct process to make high permeability material. The composition of the ferrite powder is (Ni_(0.284)Fe_(0.053)Zn_(0.663))Fe₂O₄. Ni-Zn ferrite powder is compounded by precipitating metal nitrates with NaOH in vessel at 90 ℃ synthetic temperature for 8 hours. Calcination temperature and sintering temperature were 700 ℃ and 1150 ℃~1250 ℃ respectively for 2 hours. The same compound powder was extracted from metal oxide by wet ballmilling. We compared the properties of powder and the electromagnetic characteristics of the sintered cores obtained from the two different processes. Wet direct process produces smaller particle size with narrower distribution and higher purified ferrite which cores has high permeability and high magnetization.
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