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무전해코팅법으로 제조한 Al<sub>2</sub>O<sub>3</sub>/Ni 나노 Composite의 TEM 미세조직
한재길,이재영,김택수,이병택 한국분말야금학회 2003 한국분말재료학회지 (KPMI) Vol.10 No.3
Ni coated $Al_2O_3$ composite was successfully Prepared by the electroless deposition Process. The average size of Ni particles coated on the $Al_2O_3$ matrix powder was about 20 nm. It was hard to find any reaction compound as an impurity at interface between $Al_2O_3$ and Ni particles after sintering. The characterization of microstructure crystal structure and fracture behavior of the sintered body were investigated using XRD, TEM and Victors hardness tester, and compared with those of the sintered $Al_2O_3$ monolithic body. Many dislocations were observed in the Ni phase due to the difference of thermal expansion coefficient between $Al_2O_3$ and Ni phase, and no observed microcracks at their $Al_2O_3$ and Ni interface. In the $Al_2O_3$/Ni composite, the main fracture mode showed a mixed fracture with intergranular and transgranuluar type having some ,surface roughness. The fracture toughness was slightly increased due to the plastic deformation mechanism of Ni phase in the $Al_2O_3$/Ni composite.
마이크로파-수열 합성법을 이용한 나노 수산화아파타이트 합성과 특성평가
한재길,이치우,이병택,Han, Jae-Kil,Lee, Chi-Woo,Lee, Byong-Taek 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.2
Nano-sized hydroxyapatite (HAp) powders were synthesized by a microwave-hydrothermal method using $H_3PO_4\;and\;Ca(OH)_2$ as starting materials. The applied microwave powers and mole ratio of Ca/P were served as powerful factors in the synthesis of calcium phosphate. In the case of relatively low microwave power of 450 Wand Ca/P ratio of 1.57, the mixed calcium phosphate compounds were detected in the synthesized powders. But in the case of running at 550 Wand 1.67(Ca/P), the synthesized powder showed the monophase of HAp having two kinds of morphologies. One was a needle shape with $5\~15\;nm$ in width and $20\~50\;nm$ in length, and the other was a spherical shape of $10\~40\;nm$ in diameter.
나노 Ag spot-coated TiO<sub>2</sub>-SrO 복합분체의 합성과 광촉매 활성 평가
한재길,김형철,홍원석,최성창,Han, Jae-Kil,Kim, Hyeong-Chul,Hong, Won-Seok,Choi, Sung-Chang 한국재료학회 2008 한국재료학회지 Vol.18 No.7
Nano-sized $TiO_2$-60 wt% SrO composite powders were synthesized by a sol-gel method using titanium isopropoxide and $Sr(OH)_2\;{\cdot}\;8H_2O$ as precursors. 3, -5, -7 wt%Ag spot-coated $TiO_2$-60 wt% SrO composite powders were synthesized by a Ag electroless deposition method using $TiO_2$-60 wt% SrO composite powders calcined at $1050^{\circ}C$, which mainly exhibited the $SrTiO_3$phase. However, a small number of rutile $TiO_2$, $Sr_2TiO_4$ and $SrO_2$ phases were also detected. In the Ag spot-coated powders synthesized by electroless deposition, nano-sized particles about 5-25 nm in diameter adhered to the $TiO_2$-60 wt% SrO composite powders. The photocatalytic activity of Ag spot-coated $TiO_2$-SrO and $TiO_2$-SrO composite powders for degradation of phenol showed that all of $TiO_2$-SrO composite powders were highly active under UV light irradiation. 7 wt%Ag spot-coated $TiO_2$-60wt.%SrO composite powders had a relatively higher photocatalytic activity than did $TiO_2$-SrO composite powders under visible light.
Synthesis and visible light photocatalytic activity of porous CeO2-TiO2 composite powders
한재길,고준빈,Sung-Min Choi,강인철 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
Porous CeO2-20 wt.%TiO2 composite powders having a homogeneous distribution and nanocrystalline were successfully synthesized by a sol-gel process using titanium iso-propoxide and Ce(NO3)3·6H2O as precursors. The particle sizes of the asreceived porous CeO2-20 wt.%TiO2 composite powders were measured in the range from 0.3 to 10 μm by SEM. As the calcination temperature was increased up to 1050 oC, the porous composite powders having pores ranging from 0.1 nm to 3 μm in pore size were obtained. The pore frames of CeO2-20 wt.%TiO2 composite powders were less than 500 nm thick and they were nanocrystalline with a dense structure. From a comparison of the photocatalytic activity, the porous CeO2-20 wt.%TiO2composite powders calcined at 900 oC showed an excellent efficiency for the removal of phenol under UV light. However, in the powders calcined at 600 oC, there was a relatively higher photocatalytic activity than that of other powders under visible light. Hence this sample had a strong edge band at a blue-green wavelength range.