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저널/프로시딩 상세정보

권호별목차 / 소장처보기

H : 소장처정보

T : 목차정보

한국재료학회지 = Korean journal of materials research 9건

  1. [국내논문]   Promoting Effect of MgO in the Photodegradation of Methylene Blue Over MgO/MWCNT/TiO2 Photocatalyst   SCOPUS 피인용횟수: 1

    Chen, Ming-Liang (Department of Advanced Materials & Science Engineering, Hanseo University ) , Zhang, Feng-Jun (Department of Advanced Materials & Science Engineering, Hanseo University ) , Oh, Won-Chun (Department of Advanced Materials & Science Engineering, Hanseo University)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 345 - 350 , 2010 , 1225-0562 ,

    초록

    For the present paper, we prepared MgO/MWCNT/ $TiO_2$ photocatalyst by using multi-walled carbon nanotubes (MWCNTs) pre-oxidized by m-chlorperbenzoic acid (MCPBA) with magnesium acetate tetrahydrate $(Mg(CH_2COO)_2\cdot4H_2O)$ and titanium n-butoxide $(Ti\{OC(CH_3)_3\}_4)$ as magnesium and titanium precursors. The prepared photocatalyst was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The decomposition of methylene blue (MB) solution was determined under irradiation of ultraviolet (UV) light. The XRD results show that the MgO/MWCNT/ $TiO_2$ photocatalyst have cubic MgO structure and anatase $TiO_2$ structure. The porous structure and the $TiO_2$ agglomerate coated on the MgO/MWCNT composite can be observed in SEM images. The Mg, O, Ti and C elements can be also observed in MgO/MWCNT/ $TiO_2$ photocatalyst from EDX results. The results of photodegradation of MB solution under UV light show that the concentration of MB solution decreased with an increase of UV irradiation time for all of the samples. Also, the MgO/MWCNT/ $TiO_2$ photocatalyst has the best photocatalytic activity among these samples. It can be considered that the MgO/MWCNT/ $TiO_2$ photocatalyst had a combined effect, the effect of MWCNT, which could absorb UV light to create photoinduced electrons $(e^-)$ , and the electron trapping effect of MgO, which resulted in an increase of the photocatalytic activity of $TiO_2$ .

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  2. [국내논문]   Properties of Aluminum Doped Zinc Oxide Thin Film Prepared by Sol-gel Process   SCOPUS 피인용횟수: 1

    Yi, Sung-Hak (School of Advanced Materials Engineering, Kookmin University Seoul ) , Kim, Jin-Yeol (School of Advanced Materials Engineering, Kookmin University Seoul ) , Jung, Woo-Gwang (School of Advanced Materials Engineering, Kookmin University Seoul)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 351 - 355 , 2010 , 1225-0562 ,

    초록

    Transparent conducting aluminum-doped ZnO thin films were deposited using a sol-gel process. In this study, the important deposition parameters were investigated thoroughly to determine the appropriate procedures to grow large area thin films with low resistivity and high transparency at low cost for device applications. The doping concentration of aluminum was adjusted in a range from 1 to 4 mol% by controlling the precursor concentration. The annealing temperatures for the pre-heat treatment and post-heat treatment was $250^{\circ}C$ and 400- $600^{\circ}C$ , respectively. The SEM images show that Al doped and undoped ZnO films were quite uniform and compact. The XRD pattern shows that the Al doped ZnO film has poorer crystallinity than the undoped films. The crystal quality of Al doped ZnO films was improved with an increase of the annealing temperature to $600^{\circ}C$ . Although the structure of the aluminum doped ZnO films did not have a preferred orientation along the (002) plane, these films had high transmittance (> 87%) in the visible region. The absorption edge was observed at approximately 370 nm, and the absorption wavelength showed a blue-shift with increasing doping concentration. The ZnO films annealed at $500^{\circ}C$ showed the lowest resistivity at 1 mol% Al doping.

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  3. [국내논문]   무전해 코발트 코팅된 금속계 SOFC분리판의 제조 및 특성 평가   SCOPUS

    한원규 (한양대학교 신소재 공학부 ) , 주정운 (한양대학교 신소재 공학부 ) , 황길호 (한양대학교 신소재 공학부 ) , 서현석 (한양대학교 신소재 공학부 ) , 신정철 (한양대학교 철강연구소 ) , 전재호 (포항산업과학연구원 ) , 강성군 (한양대학교 신소재 공학부)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 356 - 363 , 2010 , 1225-0562 ,

    초록

    For this paper, we investigated the area specific resistance (ASR) of commercially available ferritic stainless steels with different chemical compositions for use as solid oxide fuel cells (SOFC) interconnect. After 430h of oxidation, the STS446M alloy demonstrated excellent oxidation resistance and low ASR, of approximately 40 $m{\Omega}cm^2$ , of the thermally grown oxide scale, compared to those of other stainless steels. The reason for the low ASR is that the contact resistance between the Pt paste and the oxide scale is reduced due to the plate-like shape of the $Cr_2O_3$ (s). However, the acceptable ASR level is considered to be below 100 $m{\Omega}cm^2$ after 40,000 h of use. To further improve the electrical conductivity of the thermally grown oxide on stainless steels, the Co layer was deposited on the stainless steel by means of an electroless deposition method; it was then thermally oxidized to obtain the $Co_3O_4$ layer, which is a highly conductive layer. With the increase of the Co coating thickness, the ASR value decreased. For Co deposited STS444 with 2 ${\mu}m$ hickness, the measured ASR at $800^{\circ}$ after 300 h oxidation is around 10 $m{\Omega}cm^2$ , which is lower than that of the STS446M, which alloy has a lower ASR value than that of the non-coated STS. The reason for this improved high temperature conductivity seems to be that the Mn is efficiently diffused into the coating layer, which diffusion formed the highly conductive (Mn,Co) $_3O_4$ spinel phases and the thickness of the $Cr_2O_3$ (S), which is the rate controlling layer of the electrical conductivity in the SOFC environment and is very thin

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  4. [국내논문]   글리신-질산염 연소법으로 합성된 SrAl2O4:Eu2+,Dy3+ 형광체의 발광 및 장잔광 특성   SCOPUS

    이영기 (위덕대학교 그린에너지공학부 ) , 김정열 (위덕대학교 그린에너지공학부 ) , 이유기 (위덕대학교 그린에너지공학부)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 364 - 369 , 2010 , 1225-0562 ,

    초록

    A $SrAl_2O_4:Eu^{2+},Dy^{3+}$ phosphor powder with stuffed tridymite structure was synthesized by glycine-nitrate combustion method. The luminescence, formation process and microstructure of the phosphor powder were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The XRD patterns show that the as-synthesized $SrAl_2O_4:Eu^{2+},Dy^{3+}$ phosphor was an amorphous phase. However, a crystalline $SrAl_2O_4 $ phase was formed by calcining at $1200^{\circ}C$ for 4h. From the SEM analysis, also, it was found that the as-synthesized $SrAl_2O_4:Eu^{2+},Dy^{3+}$ phosphor was in irregular porous particles of about 50 ${\mu}m$ , while the calcined phosphor was aggregated in spherical particles with radius of about 0.5 ${\mu}m$ . The emission spectrum of as-synthesized $SrAl_2O_4:Eu^{2+},Dy^{3+}$ phosphor did not appear, due to the amorphous phase. However, the emission spectrum of the calcined phosphor was observed at 520 nm (2.384eV); it showed green emission peaking, in the range of 450~650 nm. The excitation spectrum of the $SrAl_2O_4:Eu^{2+},Dy^{3+}$ phosphor exhibits a maximum peak intensity at 360 nm (3.44eV) in the range of 250~480 nm. After the removal of the pulse Xe-lamp excitation (360 nm), also, the decay time for the emission spectrum was very slow, which shows the excellent longphosphorescent property of the phosphor, although the decay time decreased exponentially.

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  5. [국내논문]   Effect of Additives on the Refractive Index of B2O3-SiO2-Al2O3 Glasses for Photolithographic Process in Electronic Micro Devices   SCOPUS

    Won, Ju-Yeon (Now she works at SSCP Co. ) , Hwang, Seong-Jin (School of Materials Engineering, Inha University ) , Lee, Jung-Ki (School of Materials Engineering, Inha University ) , Kim, Hyung-Sun (School of Materials Engineering, Inha University)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 370 - 373 , 2010 , 1225-0562 ,

    초록

    In fabricating plasma display panels, the photolithographic process is used to form patterns of barrier ribs with high accuracy and high aspect ratio. It is important in the photolithographic process to control the refractive index of the photosensitive paste. The composition of this paste for photolithography is based on the $B_2O_3-SiO_2-Al_2O_3$ glass system, including additives of alkali oxides and rare earth oxides. In this work, we investigated the density, structure and refractive index of glasses based on the $B_2O_3-SiO_2-Al_2O_3$ system with the addition of $Li_2O$ , $K_2O$ , $Na_2O$ , CaO, SrO, and MgO. The refractive index of the glasses containing K2O, Na2O and CaO was similar to that of the [BO3] fraction while that of the SrO, MgO and Li2O containing glasses were not correlated with the coordination fraction. The coordination number of the boron atoms was measured by MAS NMR. The refractive index increased with a decrease of molar volume due to the increase in the number of non-bridging oxygen atoms and the polarizability. The lowest refractive index (1.485) in this study was that of the $B_2O_3-SiO_2-Al_2O_3-K_2O$ glass system due to the larger ionic radius of $K^+$ . Based on our results, it has been determined that the refractive index of the $B_2O_3-SiO_2-Al_2O_3$ system should be controlled by the addition of alkali oxides and alkali earth oxides for proper formation of the photosensitive paste.

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  6. [국내논문]   Effects of Chamber Pressure on Dielectric Properties of Sputtered MgTiO3 Films for Multilayer Ceramic Capacitors   SCOPUS 피인용횟수: 1

    Park, Sang-Shik (School of Nano & Materials Engineering, Kyungpook National University)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 374 - 378 , 2010 , 1225-0562 ,

    초록

    $MgTiO_3$ thin films were prepared by r.f. magnetron sputtering in order to prepare miniaturized NPO type MLCCs. $MgTiO_3$ films showed a polycrystalline structure of ilmenite characterized by the appearance of (110) and (202) peaks. The intensity of the peaks decreased with an increase in the chamber pressure due to the decrease of crystallinity which resulted from the decrease of kinetic energy of the sputtered atoms. The films annealed at $600^{\circ}C$ for 60min. showed a fine grained microstructure without micro-cracks. The grain size and roughness of the $MgTiO_3$ films decreased with the increase of chamber pressure. The average surface roughness was 1.425~0.313 nm for $MgTiO_3$ films prepared at 10~70 mTorr. $MgTiO_3$ films showed a dielectric constant of 17~19.7 and a dissipation factor of 2.1~4.9% at 1MHz. The dielectric constant of the films is similar to that of bulk ceramics. The dielectric constant and the dissipation factor decreased with the increase of the chamber pressure due to the decrease of grain size and crystallinity. The leakage current density was $10^{-5}\sim10^{-7}A/cm^2$ at 200kV/cm and this value decreased with the increase of the chamber pressure. The small grain size and smooth surface microstructure of the films deposited at high chamber pressure resulted in a low leakage current density. $MgTiO_3$ films showed a near zero temperature coefficient and satisfied the specifications for NPO type materials. The dielectric properties of the $MgTiO_3$ thin films prepared by sputtering suggest the feasibility of their application for MLCCs.

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  7. [국내논문]   세리아 안정화 지르코니아의 제조 및 특성(I) : CeO2첨가량 변화에 따른 Ce-TZP의 기계적 특성   SCOPUS 피인용횟수: 2

    정승화 ((주)쎄노텍 부설 부품소재 연구소 ) , 강종봉 (경남대학교 나노공학과)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 379 - 384 , 2010 , 1225-0562 ,

    초록

    The usual ceramic process of mixing and milling in state of oxides $ZrO_2$ and $CeO_2$ was adopted in this study in a wet process to manufacture Ce-TZP. $CeO_2$ - $ZrO_2$ ceramics containing 8~20 mol% $CeO_2$ were made by heat treatment at $1250\sim1500^{\circ}C$ for 5hr. The maximum dispersion point of every slurry manufactured with a mixture of $ZrO_2$ and $CeO_2$ was neat at pH10. A stable slurry with average particle size of 90 nm can be manufactured when it is dispersed with the use of ammonia water and polycarboxylic acid ammonium. The sintered Ce-TZP ceramics manufactured with the addition of $CeO_2$ in a concentration of less than 10 mol% progressed to the fracture of the specimen due to the existence of a monoclinic phase of more than 30% at room temperature. More than 99% of the tetragonal phase was created for the sintered body with the addition of $CeO_2$ beyond 18 mol%, but the degradation of the mechanical properties on the entire specimen was brought about due to the $CeO_2$ existing in a percentage above 3%. Consequently, the optimal Ce-TZP level combined in the oxide state was identified to be 16 mol% of $CeO_2$ contents.

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  8. [국내논문]   Fe-Mn-C계 TWIP강의 재질특성에 미치는 소둔온도와 첨가원소의 영향   SCOPUS

    정종구 (전북대학교 신소재공학부 신소재개발연구센터 ) , 김남규 (전북대학교 신소재공학부 신소재개발연구센터 ) , 윤여선 (전북대학교 신소재공학부 신소재개발연구센터 ) , 김현호 (전북대학교 신소재공학부 신소재개발연구센터 ) , 이오연 (전북대학교 신소재공학부 신소재개발연구센터)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 385 - 391 , 2010 , 1225-0562 ,

    초록

    Twinning-induced plasticity (TWIP) steels have attracted great attention due to their excellent mechanical properties of high tensile strength (over 800MPa) and high ductility (over 50%), which result from the high strain hardening due to the mechanical twin formation during plastic deformation. The purpose of this study is to investigate the effect of annealing temperature and alloying elements on the mechanical properties of Fe-18Mn-0.6C TWIP steel. In 1.5%Al TWIP steel with 0.123%Ti content, the average recrystallized grain size was reduced to 2.5 ${\mu}m$ by cold rolling and annealing at $800^{\circ}C$ for 5 min, because of the pinning effect of the fine TiC carbides on grain coarsening. The tensile strength was decreased and the ductility was improved with the increase of the annealing temperature. However, a reversion of hardness and yield strength happened between $750^{\circ}C$ and $800^{\circ}C$ due to TiC and $M_3C$ type precipitation. 0.56% Ni added TWIP steel exhibited relatively lower yield strength, because Ni precipitates were not formed during the annealing process. When this specimen was annealed at $800^{\circ}C$ for 5min, the tensile strength and elongation were revealed at 1096MPa and 61.8%, respectively.

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  9. [국내논문]   Fabrication and Characterization of BCP Nano Particle Loaded PCL Fiber and Their Biocompatibility   SCOPUS

    Nguyen, Thi-Phuong (Department of Biomedical Engineering and Materials,School of Medicine, Soonchunhyang University ) , Lee, Byong-Taek (Department of Biomedical Engineering and Materials,School of Medicine, Soonchunhyang University)
    한국재료학회지 = Korean journal of materials research v.20 no.7 ,pp. 392 - 400 , 2010 , 1225-0562 ,

    초록

    The electrospinning process was established as a promising method to fabricate nano and micro-textured scaffolds for tissue engineering applications. A BCP-loaded PCL micro-textured scaffold thus can be a viable option. The biocompatibility as well as the mechanical properties of such scaffold materials should be optimized for this purpose. In this study, a composite scaffold of poly ( $\varepsilon$ -caprolactone) (PCL)-biphase calcium phosphate (BCP) was successfully fabricated by electrospinning. EDS and XRD data show successful loading of BCP nano particles in the PCL fibers. Morphological characterization of fibers shows that with a higher loaded BCP content the fiber surface was rougher and the diameter was approximately 1 to 7 ${\mu}m$ . Tensile modulus and ultimate tensile stress reached their highest values in the PCL- 10 wt% BCP composite. When content of nano ceramic particles was low, they were dispersed in the fibers as reinforcements for the polymer matrix. However, at a high content of ceramic particles, the particles tend to agglomerate and lead to decreasing tensile modulus and ultimate stress of the PCL-BCP composite mats. Therefore, the use of nano BCP content for distribution in fiber polymer using BCP for reinforcement is limited. Tensile strain decreased with increasing content of BCP loading. From in vitro study using MG-63 osteoblast cells and L-929 fibroblast like cells, it was confirmed that electrospun PCL-BCP composite mats were biocompatible and that spreading behavior was good. As BCP content increased, the area of cell spreading on the surface of the mats also increased. Cells showed the best adherence on the surface of composite mats at 50 wt% BCP for both L-929 fibroblast-like cells and MG-63 osteoblast cell. PCL- BCP composites are a promising material for application in bone scaffolds.

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