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J. Korean Ceram. Soc. > Volume 43(1); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(1): 48.
doi: https://doi.org/10.4191/kcers.2006.43.1.048
수산화아파타이트/알루미나 복합체의 기계적 특성에 미치는 불화물 첨가제의 영향
김성환, 방희곤1, 박상엽2
강릉대학교 파인세라믹기술혁신센터
1강릉대학교 세라믹공학과
2강릉대학교 세라믹공학과, 강릉대학교 파인세라믹기술혁신센터
Effect of Fluoride Additives on Mechanical Properties in Hydroxyapatite/Alumina Composites
Sung-Hwan Kim, Hee-Gon Bang1, Sang-Yeup Park2
Technology Innovation Center for Fine Ceramics at Kangnung National University
1Department of Ceramics Engineering, Kangnung National University
2Department of Ceramics Engineering, Kangnung National University, Technology Innovation Center for Fine Ceramics at Kangnung National University
ABSTRACT
Hydroxyapatite $(HAp,;Ca_{10}(PO_4)_6(OH)_2)$/alumina composites were fabricated with the addition of fluorides, such as $MgF_2$ and $CaF_2$. In this study, the effect of fluorides on the inhibition of phase decomposition and the mechanical properties of HAp was investigated. Due to the higher solubility of F ion in HAp structure, $MgF_2$ additive was more effective compared to $CaF_2$ additive in the lowering decomposition temperature of HAp. Therefore, the dissociation tendency of HAp was fully inhibited below $1400^{circ}C$. The mechanical properties of HAp composites with $MgF_2$ additive showed higher value (flexural strength: $~170MPa$, Vickers hardness: $~7;GPa$, fracture toughness: $~1.5;MPam^{1/2}$) compared to $MgF_2-free$ composites. The linear thermal expansion coefficient of HAp composites with $MgF_2$ showed the value of $16.4times10^{-6}/^{circ}C;at;20~400^{circ}C $.
Key words: Hydroxyapatite, Alumina, Fluoride additives, Phase decomposition
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