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황산용액중의 납의 산화반응에 대한 전기화학적 등가회로해석
김기원 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-
In order to verify that the oxidation mechanism of lead in sulfuric acid solution at low overpotential region is a series two step process of dissolution-crystallization, electrochemical equivalent circuit analysis was done for the reaction at equilibrium potential with data obtained by A.C. Impedance measurements. From the results of analysis, it was considered to be reasonable that the oxidation mechanism of lead at low overpotential region was a dissolution-crystallization process.
김성한,유한성 국립경상대학교 공과대학 부설 첨단소재연구소 1999 尖端素材 Vol.9 No.-
Full color 유기ELD 제작을 위해 ITO/Inter-insulator/separator의 기판구조를 설계하였다. 새로운 photoresist 재료와 photolithography 기술을 이용하여 glass 위에 ITO와 Inter-insulator층을 패터닝하고 그 위에 역삼각형 모양(negative profile)의 음극분리 절연격벽(cathode separation insulation wall)을 미리 형성하여 유기막과 음극전극증착시 자동패턴닝(self patterning)이 되는 기술을 적용, full color 유기EL 소자기판을 제작하였다. 이 ITO/Inter-insulator/separator 구조를 갖는 기판을 이용하여 RGB 각각을 진공증착하여 full color 유기ELD를 개발하였다.
Growth of carbon nanotubes by microwave plasma-enhanced chemical vapor deposition at low temperature
Lee,Young Hee,Bae,Dong Jae,Choi,Young Chul,Lee,Byung Soo,Park,Gyeong-Su,Choi,Won Bong,Lee,Nae Sung,Kim,Jong Min 국립경상대학교 공과대학 부설 첨단소재연구소 1999 尖端素材 Vol.9 No.-
Carbon nanotubes have been grown on Ni-coated Si substrates by microwave plasma-enhanced chemical vapor deposition with a mixture of methane and hydrogen gases at temperatures ranging from 520 to 700℃. The density and the length of carbon nanotubes increased with increasing growth temperature. At growth temperature of 520℃, carbon nanotubes were curly, whereas the nanotubes were straight and self-aligned upward at temperatures above 600℃. Images of high-resolution transmission electron microscope showed that nanotubes were multiwalled with a few wall-structures. The graphitized structures were also confirmed by Raman spectra. We show that the size of Ni domains on Si substrates is correlated to the diameters of the grown carbon nanotubes.
Interfacial Studies of Organic/Inorganic Fibers for Advanced Material Application
Jang,Jyongsik 국립경상대학교 공과대학 부설 첨단소재연구소 1998 尖端素材 Vol.8 No.-
The interfacial adhesion strength in composite material is very important for its mechanical performance. There are many organic and inorganic reinforcing fibers such as ultra high modulus polyethylene (UHMPE) fiber, aramid fiber (Kevlar), glass fiber. The surface modification of these fibers and its characterization methods and their examples are summarized. For an additional example of fiber surface characterization method, the FT-IR analysis of an activated carbon fiber surface is described.
Al₂O₃의 미세구조와 기계적성질에 미치는 Mo 첨가의 영향
정원도,배원태 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-
The effects of Mo addition on the microstructure and mechanical properties of Al₂O₃ were studied, Mo powders with average sizes of 6, 1.6, and 0.6 ㎛ were dispersed in Al₂O₃. Mo particles suppressed the grain growth of Al₂O₃. With the increase of Mo amount, the relative densities of Al₂O₃/Mo composites decreased. Regardless of the particle size of Mo, the bending strength and the fracture toughness were maximized when 2.5 and 5 vol% of Mo were added respectively. When the 0.6 ㎛ Mo was used, the relative density, the bending strength, and the fracture toughness were higher than others. Comminution of 0.6 ㎛ Mo was not effective in increasing the bending strength and fracture toughness. The toughening mechani는 of Al₂O₃/Mo composite are thought to be the crack deflection and microcracking.
곽주섭,강은태 국립경상대학교 공과대학 부설 첨단소재연구소 1992 尖端素材 Vol.2 No.-
The reactions between water and mixed alkali glasses have been studied in the several temperatures and times ranging from a few to several houndred minutes. The effects of composition, SA/V ratios, and temperatures on the chemical durability were examined and the magnitude of the mixed-alkali effect was shown to be related to both the corrosion kinetics and the dominant mechanism of corrosion. If SA/V and temperature are higher, the mixed-alkali effect become large. Fro pH≥9, this effect also clearly appears. Because the leaching tendency of alkali and SiO₂are similar, the corrosion mechanism can be explained by ion-exchange and congruent leaching for SiO₂-rich nrotective laver.
염화물수용액중에서 니켈및 아연의 니켈금속표면에서의 전해환원 분극곡선
김기원 국립경상대학교 공과대학 부설 첨단소재연구소 1992 尖端素材 Vol.2 No.-
Cathodic polarization curves of nickel and zinc on nickel electrode in aqueous chloride solution were obtained using potentiodynamic polarization methode. The cathodic current density considered due to metallic nickel formation was extremely small in week acid solution, but in strong acid solution, it greatly increased. And, it was independent on nickel ion concentration. Equilibrium potentials of nickel electrode were also highly dependent on hydrogen ion concentration of chloride solution. From these result, it could be expressed that reduction of nickel oxide layer existing on nickel surface to metallic nickel preceded direct deposition of nickel from aqueous ionic state in chloride solution.
조직이 불균질화된 Al₂O₃-Zr₂O 복합체의 열-기계적 성질
김의훈,황규홍 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-
The thermo-mechanical properties of Al₂O₃-ZrO₂ ceramics having dual microstructure were studied. The Al₂O₃-ZrO₂composites having dual microstructure were fabricated by dry mixing the sieve-granulated Al₂O₃vol.% (t)ZrO₂ granule and 15 to 30 vol.% Al₂O₃-20 vol.% (m) ZrO₂granule, followed by isostatic pressing and sintering at 1600℃ for 1 hr. So Al₂O₃-20 vol.% (t)ZrO₂part was become to matrix region and Al₂O₃-20 vol.% (m)ZrO₂part was become to dispersed region as irregular sieve-shaked granule shape. When weak granule was used for dispersed region, initial strength was slightly decreased than the matrix composite, but retained strength after thermal shock was increased. And if weak granule have been used for dispersed region smaller than that for matrix region, critical temperature and strength was slightly increased due to the different existing shape of dispersed region in the duplex composites. But strong granule made by high temperature calicination was used for dispersed region, thermal shock behavior showed stable crack growth because the dispersed region had lower density than matrix.