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Al<sub>2</sub>O<sub>3</sub>-3YSZ 복합체의 미세구조 및 기계적 특성에 대한 Al<sub>2</sub>O<sub>3</sub> 분말 크기의 영향
윤제정,전승엽,황진아,박수영,전명표,Yoon, Jea-Jung,Chun, Seung-Yeop,Hwang, Jin-Ah,Park, Su-Young,Chun, Myoung-Pyo 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
3YSZ + (x) $Al_2O_3$ composites (x = 20, 40, 60, 80 wt%) were fabricated and the influences of particle sizes of $Al_2O_3$ on their microstructures and mechanical properties were investigated with XRD, SEM, vickers hardness and fracture toughness. $Al_2O_3$-3YSZ composites containing $Al_2O_3$ powder of a $0.3{\mu}m$ and an $1.0{\mu}m$, which are here in after named as $Al_2O_3$($0.3{\mu}m$)-3YSZ and $Al_2O_3$($1.0{\mu}m$)-3YSZ, respectively, were made by mixing raw materials, uni-axial pressing and sintering at $1,400^{\circ}C$, $1,500^{\circ}C$, and $1,600^{\circ}C$. $Al_2O_3$($0.3{\mu}m$)-3YSZ composites show the higher density and the better mechanical properties than $Al_2O_3$($1.0{\mu}m$)-3YSZ composites. The Vickers hardness of the $Al_2O_3$($0.3{\mu}m$)-3YSZ composites show a peak value of 1,997 Hv at the content of 60 wt% $Al_2O_3$, which is a slightly higher value in comparison with 1,938 Hv of the $Al_2O_3$($1.0{\mu}m$)-3YSZ composite. However, the fracture toughness of $Al_2O_3$-3YSZ composites monotonically increases with decreasing the content of $Al_2O_3$ without any peak values. $Al_2O_3$($0.3{\mu}m$)-3YSZ and $Al_2O_3$($1.0{\mu}m$)-3YSZ composites sintered at $1,600^{\circ}C$ have a maximum value of a $6.9MPa{\cdot}m^{1/2}$ and a $6.2MPa{\cdot}m^{1/2}$, respectively at the composition of containing 20 wt% $Al_2O_3$. It should be noticed that the mechanical properties and the sintering density of the $Al_2O_3$-3YSZ composites can be enhanced by using more fine $Al_2O_3$ powder due to their denser microstructure and smaller grain size.
윤제정,박경희,김남인,홍창국 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.3
A manganese dioxide (MnO2) layer and zinc (Zn) layer are used as the cathode and the anode to develop filmtype manganese battery, in which a stack of a MnO2 layer, gel electrolyte, and Zn layer are sandwiched between two plastic layers. This paper describes the chemical equation of swelling control upon the film-type manganese battery. We examined the reduction of hydrogen formation, by using calcium hydroxide Ca(OH)2 as an additive in the electrolyte of film-type manganese battery. The phenomena or an effect of reduced hydrogen gas was proven by cyclic voltammogram, X-ray photoelectron spectra (XPS), and volume of hydrogen formation. The amount of H2 gas generation in the presence of Ca2+ ion was reduced from 4.81 to 4.15 cc/g-zinc (14%), and the corrosion of zinc electrode in the electrolyte was strongly inhibited as time passed.
MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-ZrO<sub>2</sub>계 글라스 세라믹의 제조 및 특성 평가
윤제정,전명표,신효순,남산,Yoon, Jea-Jung,Chun, Myoung-Pyo,Shin, Hyo Soon,Nahm, San 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11
Glass ceramic has a high mechanical strength and low sintering temperature. So, it can be used as a thick film substrate or a high strength insulator. A series of glass ceramic samples based on MgO-$Al_2O_3-SiO_2-ZrO_2$ (MASZ) were prepared by melting at $1,600^{\circ}C$, roll-quenching and heat treatment at various temperatures from $900^{\circ}C$ to $1,400^{\circ}C$. Dependent on the heat treatment temperature used, glass ceramics with different crystal phases were obtained. Their nucleation behavior, microstructure and mechanical properties were investigated with differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Vicker's hardness testing machine. With increasing the heat treatment temperature of MASZ samples, their hardness and toughness initially increase and then reach the maximum points at $1,300^{\circ}C$, and begin to decrease at above this temperature, which is likely to be due to the softening of glass ceramics. As the content of $ZrO_2$ in MAS glass ceramics increases from 7.0 wt.% to 13 wt.%, Vicker's hardness and fracture toughness increase from $853Kg/mm^2$ to $878Kg/mm^2$ and $1.6MPa{\cdot}m^{1/2}$ to $2.4MPa{\cdot}m^{1/2}$ respectively, which seems to be related with the nucleation of elongated phases like fiber.
Al2O3-3YSZ 복합체의 미세구조 및 기계적 특성에 대한 Al2O3 분말크기의 영향
윤제정,전승엽,황진아,박수영,전명표 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
3YSZ + (x) Al2O3 composites (x = 20, 40, 60, 80 wt%) were fabricated and the influences of particle sizesof Al2O3 on their microstructures and mechanical properties were investigated with XRD, SEM, vickers hardness andfracture toughness. Al2O3–3YSZ composites containing Al2O3 powder of a 0.3 μm and an 1.0 μm, which are here inafter named as Al2O3(0.3 μm)-3YSZ and Al2O3(1.0 μm)-3YSZ, respectively, were made by mixing raw materials,uni-axial pressing and sintering at 1,400℃, 1,500℃, and 1,600℃. Al2O3(0.3 μm)-3YSZ composites show the higherdensity and the better mechanical properties than Al2O3(1.0 μm)-3YSZ composites. The Vickers hardness of theAl2O3(0.3 μm)-3YSZ composites show a peak value of 1,997 Hv at the content of 60 wt% Al2O3, which is a slightlyhigher value in comparison with 1,938 Hv of the Al2O3(1.0 μm)-3YSZ composite. However, the fracture toughness ofAl2O3-3YSZ composites monotonically increases with decreasing the content of Al2O3 without any peak values. Al2O3(0.3 μm)-3YSZ and Al2O3(1.0 μm)-3YSZ composites sintered at 1,600℃ have a maximum value of a 6.9MPa·m1/2 and a 6.2 MPa·m1/2, respectively at the composition of containing 20 wt% Al2O3. It should be noticed thatthe mechanical properties and the sintering density of the Al2O3-3YSZ composites can be enhanced by using more fineAl2O3 powder due to their denser microstructure and smaller grain size. Al2O3에 3mol.%의 Y2O3로 안정화시킨 정방정 지르코니아(Yttria-stabilized zirconia: YSZ)를 치환시켜 (100-x) Al2O3–(x) 3YSZ (x = 20, 40, 60, 80 wt.%) 복합체를 제조하였다. 또한, Al2O3 입자 크기에 따른 소결 특성 및 미세구조 그리고 기계적 특성 변화를 XRD, SEM, 비커스 경도계와 파괴인성으로 확인하였다. Al2O3 입자의 크기를 0.3 μm, 1.0 μm 로 하여 제조한 Al2O3(0.3μm)-3YSZ, Al2O3(1.0μm)-3YSZ를 일축가압성형 한 뒤 각 1400°C, 1500°C, 1600°C에서 소결을 진행하였다. Al2O3(0.3μm)-3YSZ 의 경우 Al2O3(1.0μm)-3YSZ 보다 더 높은 밀도와 기계적 특성을 나타내었다. 비커스 경도는 Al2O3(0.3μm)-3YSZ의 경우 3YSZ가 40 wt% 일 때 최고 1997 Hv 값을 나타내었으며, 같은 조건에서 최고 1938 Hv 값을 나타낸 Al2O3(1.0μm)-3YSZ 보다 높게 나타났다. 그러나 Al2O3입자 크기가 다른 두 시편 모두 3YSZ 함량이 증가할수록 연속적으로 파괴인성 값이 증가함을 보이며, Al2O3 입자크기 0.3μm, 1.0μm 시편 모두 3YSZ 함량이 80wt%일 때 소결온도 1600°C에서 각각 6.9MPa1/2와 6.3MPa1/2의 최대의 파괴인성 값을 나타내었다. 결과적으로 Al2O3의 입자 크기가 작을수록 보다 작은 결정립으로 구성된 치밀한 미세구조의 고강도의 Al2O3-3YSZ 복합체가 가능하다.
알루미나-TZP(3Y) 세라믹스 복합체의 제조 및 기계적 특성
윤제정,전명표,남산,Yoon, Jea-Jung,Chun, Myoung-Pyo,Nahm, San 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.3
Composite ceramics of alumina-TZP(3Y) have good mechanical and electrical properties. So, They have been used as high strength refractory materials and thick film substrates, etc. In this study, Composite ceramics of alumina-TZP(3Y) were fabricated by uniaxial pressing and sintering at 1,400, 1,500, and $1,600^{\circ}C$, and their microstructures and mechanical properties were investigated. As the TZP(3Y) content in composite ceramics increases from 20 wt.% to 80 wt.%, the fracture toughness increases monotonically, which seems to be related to the higher relative density and/or toughening mechanism by means of stabilized tetragonal zirconia phase at room temperature. In contrast to the fracture toughness, Vickers hardness of the composite ceramics shows maximum value (1,938 Hv) at a 40 wt.% of TZP(3Y). The result of Vickers hardness is likely to be due to more dense sintered microstructure of composite ceramics than pure alumina and reinforcement of composite ceramics with TZP(3Y), considering that Vickers hardness of pure $Al_2O_3$ is greater than that of TZP(3Y). It is also shown that the $ZrO_2$ particles are $l^{\circ}Cated$ between $Al_2O_3$ grains and suppress grain growth each other.
윤제정 ( Je Jung Yun ),이재욱 ( Jae Wook Lee ),한은미 ( Eun Mi Han ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
So far, as a electron donor Poly (3-hcxyl-thiophene) (P3HT) and acceptor [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) are the best combination in the bulk heterojunction organic semiconducting solar cell. P3HT based organic solar cell has much attractive to offer important technological potential advances owing to its advantageous properties: electron rich, high charge carrier mobility, relatively small band gap (~2.l eV), relatively good thermal stability, soluble in organic solvent and etc. In this paper, photovoltaic effects are directly affected by the active layer thickness which proportional to the series resistance. Another characteristics are inverse portional to the shunt resistance, short circuit current and fill factor with increase of active layer thickness: 240 nm(1 wt%), 430 nm(2 wt%), 720 nm(3 wt%), 895 nm(4 wt%) and 1095 nm(5 wt%). Active layer were blended with P3HT and PCBM. The highest photon to current conversion efficiency was the one which active layer thickness was 240nm. These result could be driven that the optimum condition of high efficiency strongly related the limitation factors of absorption of photons and electron path as resistances.