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Y2O3와 CeO2의 첨가에 따른 Y-TZP계 세라믹스의 기계적 특성
강종봉 ( Jong Bong Kang ),정승화 ( Seung Hwa Jung ),문종수 ( Jong Soo Mun ),정기욱 ( Ki Uk Jung ) 경남대학교 신소재연구소 2009 신소재연구 Vol.21 No.-
Y-TZP계 세라믹스의 특성 및 기계적 물성을 향상시키기 위한 대표적인 첨가제로는 SiO2, TiO2, Fe2O3, Al2O3 등을 들 수 있으며, 이러한 첨가제들의 종류와 양은 Y-TZP계 세라믹스의 기계적 물성에 있어서 제조 공정 조정 변수와 더불어 중요한 역할을 한다. 본 실험에서는 Y2O3와 CeO2의 첨가가 Y-TZP세라믹스에 미치는 영향을 확인하기 위하여, 지르코니아에 안정화제인 Y2O3를 2.4~3.4 mol% 첨가하여 혼합 밀링 하였으며, CeO2의 첨가로 인한 3.2Y-TZP의 소결체에 미치는 영향에 대하여 연구하였다. 그 결과 Y2O3가 3.2 mol% 첨가된 3.2Y 시편은 1400℃에서 6.08 g/cm3의 겉보기 밀도와 1390.4 Hv의 높은 경도 값을 나타내었으며, 1300℃에서부터 정방정상으로의 상전이가 이루어졌다. 하지만 1500℃ 온도구간에서 다시 단사정상이 잔존해있음을 관찰하였다. Y2O3가 3.2 mol% 첨가된 3.2Y 시편에 CeO2를 0.l wt% 첨가 시 1350℃에서 가장 높은 1404.4 Hv의 경도와, 6.08 g/cm3의 겉보기 밀도 값을 가졌지만 1500℃에서 단사정상이 잔존해있음을 관찰하였으며, 미세구조 관찰 시 CeO2의 첨가량이 증가할수록 큰 결정립들이 관찰되었고, 이러한 결정립들이 정방정상의 임계크기 이상으로 성장하였기 때문에 단사정상이 잔존해 있는 것으로 사료되어진다. Zirconia ceramics is the excellent mechanical properties of the organic phase-moss. Because zirconia ceramics trans from tetragonal to monoclinic. This is used structural materials. The Y-TZP of ceramics are the most widely used. Typically, 3Y-TZP powder made coprecipitation is the high cost of manufacturing and highly sintering temperature than 1450℃. In this study, Powder mixed and milled of the Y2O3 and ZrO2 oxides will decrease costs. It is purpose to lowering sintering temperature and increasing mechanical properties by added Al2O3 and CeO2. 3.2Y-TZP added 0.25 wt% of Al2O3 got 99.4% of theoretical density value by 1350℃ sintered. 32Y-TZP added 0.25 wt% Al2O3 and 0.1 wt% CeO2 got the best hardness (1412.1 Hv) by 1400℃ sintered.
졸-겔법에 의한 SiO<sub>2</sub>-TiO<sub>2</sub> 박막의 초친수성
박민정,이경석,강종봉,문종수,Park, Min-Jung,Lee, Kyoung-Seok,Kang, Jong-Bong,Mun, Chong-Soo 한국재료학회 2007 한국재료학회지 Vol.17 No.3
[ $TiO_{2}-solution$ ] was aaded in $SiO_{2}-solution$ by various composition. $SiO_{2}-TiO_{2}$ thin films were obtained by the dip-coating method on the $SiO_{2}$ glass substrates, and then heat-treated at various temperature. Nano-size $TiO_{2}$ particles dispersed $SiO_{2}-TiO_{2}$ films showed absorption peak by quantum size effect at short wavelength region $350{\sim}400nm$, which made them good candidates for non-linear optical materials and photo-catalytic materials. The thickness of $SiO_{2}-TiO_{2}$ films were $300{\sim}430nm$. The contact angle of $SiO_{2}-TiO_{2}$ films for water was $5.3{\sim}47.9^{\circ}$, and therefore it is clear that $SiO_{2}-TiO_{2}$ films have super hydrophilic properties and the self-cleaning effects.
BLU 및 형광체 코딩용 알루미나 분산액의 제조 및 평가
유정환,정승화,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
The suspension of $Al_2O_3$ which has long-term stability was made by mechanical milling. Thin films were evaluated and made to use as coating materials. A particle size of the suspension manufactured was 98 nm when 2 mt% nitric acid was added. It indicated that viscosity of the suspension is 12 cps and that it had the long-term stability. Thickness which was from 200 nm to 600 nm of the thin films was able to be made by adjusting draw rate and organic additive. Cracks of thin films at room temperature were prevented by adding Ethyl cellulose from 0.5 wt% to 2 wt%. The thin film heated at $500^{\circ}C$ indicated a hydrophilic property against water and an excellent permeability against a visible ray.
기계적 분쇄방법을 통한 코팅용 알루미나 졸의 제조 및 평가
유정환,정승화,조범래,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Jo, Bum-Rae,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국재료학회 2008 한국재료학회지 Vol.18 No.8
$Al_2O_3$ sol with long-term stability was prepared by mechanical milling. Thin films were evaluated and created for use as coating materials. The particle size of the manufactured sol was 98 nm when 2 wt% of nitric acid was added. This indicates that the viscosity of the sol is 12 cps and that it has long-term stability. The thickness of the thin films, which varied from 100 nm to 500 nm, could be managed by adjusting the draw rate and the amount of an organic additive. A thin film heated to $500^{\circ}C$ indicated a hydrophilic property against water and excellent permeability against a visible ray.
황진명 ( Jin Myung Hwang ),정승화 ( Seung Hwa Jung ),문종수 ( Jong Soo Mun ),강종봉 ( Jong Bong Kang ) 경남대학교 신소재연구소 2009 신소재연구 Vol.21 No.-
16Ce-TZP에 산화물 첨가제가 미치는 영향에 대하여 연구하였다. Fe2O3, MnO, CuO 등의 산화물 첨가제롤 이용하여 1150∼1350℃의 온도에서 소결을 실시하였다. CuO의 첨가는 첨가량이 증가할수록 저온에서의 소결을 촉진하는 것을 확인하였지만 고온으로 증가할수록 첨가량이 많았을 때 물성이 낮아지는 것을 확인하였다. 그리고 MnO의 첨가는 0.5 wt%이상이 첨가되었을 때부터 저온에서의 소결을 촉진시켰으며 1.0 wt%의 MnO가 첨가되었을 때 1250℃의 온도에서 6.28 g/cm3의 밀도와 1220 Hv의 경도 값을 나타내었다. 특히 1 wt% Fe2O3가 첨가되었을 때 1250℃에서 6.3 g/cm3의 밀도와 1230 Hv의 경도로 다른 산화물들보다 높은 물성을 나타내었고, 1200℃에서부터 미세기공 등이 관찰되지 않는 치밀한 미세구조를 가졌으며 정방정상으로의 상전이가 완료됨을 확인할 수 있었다. Ce-TZP(Ceria Stabilized Zirconia) has excellent thermal and chemical resistant properties than Y-TZP which has excellent fracture toughness, but Ce-TZP sintering temperature is high, the mechanical properties is a low-end weak point. In this experiment, l6Ce-TZP(16 mol% Ceria Stabilized Zirconia) was fabricated with different amounts of CuO, MnO, Fe2O3, Y2O3, and the mechanical properties and sintering behaviors were analysed, and Resistance under confirming boil about low temperature thermal degradation of Ce-TZP, Y-TZP(Yttria Stabilized Zirconia). All the specimens with additives could have tetragonal only phase at relatively low temperature, which could be explained by formation of vacancy with additives. The specimen with 1.0 wt% Fe2O3 showed high apparent density(6.3 g/cm3), microhardness(1230 HV) sintered at 1250℃. Addition of Fe2O3 into the Ce-TZP helped lowering the phase transformation temperature, and the fine grained microstructure, and high mechanical properties could be achieved.