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J. Korean Ceram. Soc. > Volume 50(3); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(3): 226.
doi: https://doi.org/10.4191/kcers.2013.50.3.226
초고압을 이용한 나노급 마그네시아 분말의 저온 소결 연구
송정호, 엄정혜, 노윤영, 김영욱, 송오성
서울시립대학교 신소재공학과
Low Temperature Processing of Nano-Sized Magnesia Ceramics Using Ultra High Pressure
Jeongho Song, Junghye Eom, Yunyoung Noh, Young-Wook Kim, Ohsung Song
Department of Materials Science and Engineering, University of Seoul
We performed high pressure high temperature (HPHT) sintering for the 20 nm MgO powders at the temperatures from $600^{circ}C$ to $1200^{circ}C$ for only 5 min under 7 GPa pressure condition. To investigate the microstructure evolution and physical property change of the HPHT sintered MgO samples, we employed a scanning electron microscopy (SEM), density and Vickers hardness measurements. The SEM results showed that the grain size of the sintered MgO increased from 200 nm to $1.9{mu}m$ as the sintering temperature increased. The density results showed that the sintered MgO achieved a more than 95% of the theoretical density in overall sintering temperature range. Based on Vickers hardness test, we confirmed that hardness increased as temperature increased. Our results implied that we might obtain the dense sintered MgO samples with an extremely short time and low temperature HPHT process compared to conventional electrical furnace sintering process.
Key words: Magnesium oxide, HPHT sintering, Nano powder, Low temperature sintering, Hardness
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