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지충수 국민대학교 생산기술연구소 2002 공학기술논문집 Vol.25 No.-
Hydrous oxide layers were formed on pure aluminum substrate in water at 100℃, and then the layers were anodized in a 2.32M boric acid at 300V. Transformation behaviors of the oxide layers according to the hydration and heat treatments were studied using TEM, RBS etc. Hydrous oxide showed growth rate of approximately 24.5nm/min. Formation of anodic aluminum oxide on hydrous oxide layers was more effective for the transition of amorphous anodic oxides to the crystalline T-Al₂O₃, comparing with the case for anodizing on the aluminum substrate without hydration treatment. And additional heat treatments were also helpful for the acceleration of the transformation of the hydrous oxide to ‘Τ-Al₂O₃. During the heat treatment the interface between Τ-Al₂O₃ and the hydrous oxide layers migrated to the outer side of hydrous layer.
池忠洙,崔秉泳 전북대학교 공업기술연구소 1983 工學硏究 Vol.13 No.-
A study has been made on the transformation behavior of austenite from various initial structure, coarse ferrite+pearlite, fine ferrite+pearlite, tempered martensite in low carbon Mn steels. In order to observe the process of austenite formation, specimens were soaked an 890℃ for 10~300 sec. Experimental results showed as follows ; 1. The rate of austenite transformation is increased in case of smaller grain size of initial structure and at higher heating temperature. Transformation from tempered martensite is faster than that from ferrite+pearlite initial structure. 2. There is incubation period prior to nucleation at the beginning of austenite transformation, ant it is shorter in case of smaller grain size and at higher heating temperature. 3. Nucleation of austenite is observed at ferrite-ferrite boundary and ferrite-pearlite interface. Nuclei of austenite form primarily at pearlite region and grow into ferrite region.
붕산용액에서 형성된 알루미늄 전해콘덴서용 박의 화성피막 조직분석
김성갑,김성수,오한준,조남돈,지충수,Kim, Seong-Gap,Kim, Seong-Su,O, Han-Jun,Jo, Nam-Don,Ji, Chung-Su 한국재료학회 2001 한국재료학회지 Vol.11 No.4
Microstructures of barrier-type oxide layers on aluminum was studied by XRD, TEM and RBS. Fer formation of oxide layer. aluminum was anodized in a boric acid solution. The thickness of the oxide film subjected to applied voltage increased linearly at ratio of 1.54nm/V. For oxide layer anodized at 300V, amorphous structure of oxide layer was not transformed after heat treatment at 50$0^{\circ}C$ , while for oxide layers anodized at higher voltages the amorphous structure crystallized into a ${\gamma}$-alumina without any heat treatment. It was also found that the amorphous structure of oxide layer formed at 100V transformed into crystalline structure by electron irradiation. The structure was identified as ${\gamma}$-alumina. 붕산용액에서 양극산화법으로 장벽형 산화피막을 형성시킨 후 미세조직을 관찰하였다. 양극산화시 인가되는 전압에 따른 피막의 성장속도는 1.54nm/v의 직선적인 관계를 나타냈으며 300v의 인가전압에서 생성된 산화피막의 조직은 50$0^{\circ}C$에서 열처리하였을 경우 피막의 상 전이가 일어나지 않았으나 높은 인가전압에서 생성된 산화피막의 경우는 피막의 조직이 비정질에서 ${\gamma}$-alumina로 변태되는 것이 관찰되었다. 또한 피막이 전자빔 조사에 의해서도 ${\gamma}$-alumina로 전이가 일어났다.
양극산화법에 의한 나노와이어 제조I. 알루미나 나노 템플레이트의 특성
조수행,오한준,박치선,장재명,지충수,Jo, Su-Haeng,O, Han-Jun,Park, Chi-Seon,Jang, Jae-Myeong,Ji, Chung-Su 한국재료학회 2002 한국재료학회지 Vol.12 No.2
Anodic alumina layer can be used as templates for preparation of nano-structured materials, because porous oxide layer on aluminum shows a uniform pore size and a high pore density. In order to find out possibility for template material to prepare nano wire, the effects of the anodic applied potential, anodic time and the temperature of electrolyte on pore diameter of anodic alumina layer were studied using SEM and AFM. The pore diameter of anodic alumina layer increased with applied anodic potential and electrolytic temperature. Especially, the pore diameter of anodic oxide layers formed in chromic acid can be well replicated by widening process in $H_3$$PO_4$solution.
전기화학적 방법에 의한 TiO<sub>2</sub> 피막의 생성기구
오한준,이종호,장재명,지충수,O, Han-Jun,Lee, Jong-Ho,Jang, Jae-Myeong,Ji, Chung-Su 한국재료학회 2002 한국재료학회지 Vol.12 No.6
A $TiO_2$ film for photocatalyst was prepared by anodic oxidation at 180V in acidic electrolyte and film formation mechanism was studied. The major part of anodic $TiO_2$ film consisted of anatase type structure and surface morphology exhibited a porous cell structure. The thickness growth rate of the oxide film with anodization time revealed two-stage slope corresponds to the surface morphology between anodic films. The growth of pores on cell structure and the growth rate of film with two-stage slope are related to the constant formation rate of the $TiO_2$ layer.
알루미늄 양극산화 피막의 상전이에 미치는 수화처리의 영향
주은균,김성수,오한준,조수행,지충수,Joo, E.K.,Kim, S.S.,Oh, H.J.,Cho, S.H.,Chi, C.S. 한국재료학회 2002 한국재료학회지 Vol.12 No.7
Hydration treatments were performed on the pure aluminum substrate at $100^{\circ}C$ followed by anodizing and heat treatments on the layers. The transformation behaviors of the oxide layers according to the hydration treatment were studied using TEM, XRD, RBS etc. Above $90^{\circ}C$ the hydrous oxide film could be formed, which were turned out to be hydrous oxides(AlOOH $nH_2$O). The anodization on the hydrous oxide film was more effective for the transition of amorphous anodic oxides to the crystalline $\Upsilon-Al_2$ $O_3$ comparing with the case for anodizing on the aluminum substrate without hydration treatment And additional heat treatments were also helpful for the acceleration of the transformation of the hydrous oxide to $\Upsilon-Al_2$ $O_3$. During the heat treatment the interface between $\Upsilon-Al_2$ $O_3$and the hydrous oxide layers migrated to the outer side of hydrous layer.