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$HfO_2$와 $CeO_2$가 첨가된 3Y-TZP 치과용 블록의 제조 및 특성 평가
지상용,지형빈,박홍채,윤석영,Ji, Sang-Yong,Ji, Hyung-Bin,Park, Hong-Chae,Yoon, Seog-Young 한국결정성장학회 2009 韓國結晶成長學會誌 Vol.19 No.6
CAD/CAM 가공이 가능한 치과용 3Y-TZP블록을 제조하였다. 블록 제조를 위하여 3Y-TZP분말에 $HfO_2$와 $CeO_2$ 분말을 첨가하여 $800{\sim}1100^{\circ}C$에서 열처리 한 후 $1450^{\circ}C$에서 소결하였으며, 이때 $HfO_2$와 $CeO_2$ 분말의 첨가량 및 열처리 조건에 따른 블록의 기계적 특성 및 화학적 특성을 조사하였다. EDS mapping 이미지를 통하여 $HfO_2$와 $CeO_2$ 분말이 3Y-TZP에 비교적 분산이 잘되어 있음을 확인하였다. 본 실험에서는 3 wt% $HfO_2$가 첨가된 블록이 가장 높은 굽힘 강도(1 GPa)를 나타내었으며, 3 wt% $CeO_2$가 첨가된 블록은 수열분위기하에서의 $t-ZrO_2$의 안정성을 향상 시키는 것으로 확인되었다. 3Y-TZP block doped with $HfO_2$ and $CeO_2$ for dental ceramic block to the proliferation of CAD/CAM systems was prepared by heating at $800{\sim}1100^{\circ}C$ and then sintering at $1450^{\circ}C$. The influences of heating temperature and addition of $HfO_2$ and $CeO_2$ on the mechanical and chemical properties of 3Y-TZP block were investigated. Using the EDS mapping images, $HfO_2$ and $CeO_2$ was well dispersed in the 3Y-TZP matrix. 3 wt% $HfO_2$ doped block showed the optimum biaxial strength (1 GPa), while 3 wt% $CeO_2$ doped block enhanced the stability of $t-ZrO_2$ under hydrothermal atmosphere.
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김원영,지형빈,양태영,윤석영,박홍채 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.2
Porous mullite/alumina composites have been fabricated by a freeze casting technique using TBA-based coal fly ash/alumina slurry. After sintering, unidirectional macropore channels aligned regularly along the TBA ice growth direction were developed; simultaneously, small sized micropores fromed in the outer walls of the pore channels. The physical and mechanical properties (e.g. porosity and compressive strength) of the sintered porous composites were roughly dependant of processing conditions, due to the complexity of the factors affecting them. However, with increasing solid loading and sintering temperature, the compressive strength generally increased and the porosity decreased. After sintering 1500 oC for 2 h, the porous specimen (porosity: 52.1%) showed a maximum compressive strength of 70.0MPa.
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폴리머 발포법을 이용한 다공성 HAp 지지체의 제조 및 특성 평가
김진국,지상용,지형빈,박홍채,윤석영,Kim, Zin-Kook,Ji, Sang-Yong,Ji, Hyung-Bin,Park, Hong-Chae,Yoon, Seog-Young 한국재료학회 2008 한국재료학회지 Vol.18 No.6
Porous HAp with three-dimensional network channels was prepared in a polymer foam process using a in-situ formation. HAp/polyol with various HAp solid contents was formed with an addition of isocyanate. Under all conditions, the obtained porous HAp had pore sizes ranging $50\;{\mu}m$ to $250\;{\mu}m$. The influence of the HAp content on the physical and mechanical properties of porous HAp scaffolds was investigated. As the solid content increased, the porosity of the porous HAp decreased from 79.3% to 77.9%. On the other hand, the compressive strength of the porous HAp increased from 0.7 MPa to 3.7 MPa. With a HAp solid content of 15 g, the obtained porous HAp had physical properties that were more suitable for scaffolds compared to other conditions.
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