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MoO3 thin film synthesis by chemical vapor transport of volatile MoO3(OH)2
오승탁,김영도,Young Jung Lee,Chang Won Park,Dae-Gun Kim,William Thomas Nichols 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
Molybdenum oxide thin films with good adhesion and crystallinity were homogeneously deposited by the chemical vapor transport of MoO3(OH)2 and subsequent dehydration to the Mo oxide phase during hydrogen-reduction. This new deposition technique would be an effective deposition method for MoO3 thin films due to the simple, low-cost, large area deposition and eco-friendly process. The surface morphology dramatically changed by thermal annealing at different temperatures and a uniform ~1 μm thickness was obtained. The effect of the annealing temperature is discussed.
$Al_2O_3$/5vo1%Cu 나노복합재료의 제조 및 기계적특성
오승탁,이재성,Koichi Niihara 한국분말야금학회 2000 한국분말재료학회지 (KPMI) Vol.7 No.4
An optimum route to fabricate the $Al_2O_3/Cu$ nanocomposites with sound microstructure and improved mechanical properties was investigated. Microstructural investigations for the composites prepared using $Al_2O_3/Cu$-nitrate showed that fine Cu particles with average size of 150 nm were homogeneously distributed within the $Al_2O_3$ matrix grains and at the grain boundaries. Fracture strength of 953 MPa and toughness of 4.8 Mpa(equation omitted)m were measured for the composite. The strengthening and toughening of the composites are explained by the refinement of the microstructure and the crack bridging/deflection, respectively.
나노크기 금속입자가 분산된 Al<sub>2</sub>O<sub>3</sub> 나노복합재료의 제조 및 마모거동
오승탁,윤세중,정영근,Oh Sung-Tag,Yoon Se-Joong,Jeong Young-Keun 한국재료학회 2005 한국재료학회지 Vol.15 No.8
Microstructure and wear behavior of A1203-based nanocomposites with Cu and Ni-Co dispersions were investigated. $Al_2O_3/Cu$ and $Al_2O_3/Ni-Co$ nanocomposites were fabricated by hydrogen reduction and sintering method using metal oxide and metal nitrates. The nanocomposites showed increased mechanical properties compared with monolithic $Al_2O_3$. In particular, high toughness and hardness were measured for the $Al_2O_3/Ni-Co$ nanocomposite consolidated by spark plasma sintering. A minimum value of wear coefficient comparable to the monolithic $Al_2O_3$ was obtained for $Al_2O_3/Ni-Co$ nanocomposite. Wear behavior is discussed in terms of microstructure and mechanical properties of nanocomposites
원료분말에 따른 Al<sub>2</sub>O<sub>3</sub>/CuO 분말혼합체의 수소환원 거동 및 미세조직 특성
오승탁,김정남,강계명,Oh Sung-Tag,Kim Jung-Nam,Kang Kae-Myung 한국재료학회 2004 한국재료학회지 Vol.14 No.10
The reduction behavior of $Al_{2}O_3/CuO$ powder mixtures, prepared from $Al_{2}O_3/CuO$ or $Al_{2}O_3/Cu-nitrate$, was investigated by using thermogravimetry and hygrometry. The powder characteristics were examined by BET, XRD and TEM. Also, the influence of powder characteristics on the microstructure and properties of hot-pressed composites was analyzed. The formation mechanism of nano-sized Cu dispersions was explained based on the powder characteristics and reduction kinetics of oxide powders. In addition, the dependence of the microstructure and mechanical properties of hot-pressed composites on powder characteristics is discussed in terms of the initial size and distribution of Cu particles. The practical implication of these results is that an optimum processing condition for the design of homogeneous microstructure and required properties can be established.
A1₂O₂/CuO 혼합분말의 수소환원 거동 및 미세조직 특성
오승탁 서울産業大學校 2005 논문집 Vol.54 No.1
분산상Cu3 CuO 및 Cu-nitrate로 선택하여 제조한 Al₂0₃/Cu0 혼합분말에서의 나노금속 입자 형성기구를 정량적으로 해석하여, 분말제조 공정과 산화물 환원거동의 관계 및 이러한 거동이 최종 소결체의 미세조직과 특성에 미치는 영향에 대하여 고찰하였다. Al₂O₃/Cu-nitrate를 원료분말로 사용한 경우에서, 수소환원 후에 미세한 Cu 입자의 균일한 분포를 갖는 복합분말을 제조할 수 있었으며, 최종 소결체에서도 증가된 파괴강도를 나타내었다. 이러한 차이는 주로 원료분말의 환원특성에 따른 것으로 해석하였다.
나노크기 Sn 분말의 산화열처리에 의한 SnO<sub>2</sub>분말의 합성 및 미세조직 특성
오승탁,이성일,주연준,Oh, Sung-Tag,Lee, Sung-Il,Joo, Yeon-Jun 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.5
Oxidation behavior and microstructural characteristics of nano-sized Sn powder were studied. DTA-TG analysis showed that the Sn powder exhibited an endothermic peak at $227^{\circ}C$ and exothermic peak at $560^{\circ}C$ with an increase in weight. Based on the phase diagram consideration of Sn-O system and XRD analysis, it was interpreted that the first peak was for the melting of Sn powder and the second peak resulted from the formation of $SnO_2$ phase. Microstructural observation revealed that the $SnO_2$ powder, heated to $1000^{\circ}C$ under air atmosphere, consisted of agglomerates with large particle size due to the melting of Sn powder during heat treatment. Finally, fine $SnO_2$ powders with an average size of 50nm can be fabricated by controlled heat treatment and ultrasonic milling process.