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http://dx.doi.org/10.4191/KCERS.2006.43.1.048

Effect of Fluoride Additives on Mechanical Properties in Hydroxyapatite/Alumina Composites  

Kim, Sung-Hwan (Technology Innovation Center for Fine Ceramics at Kangnung National University)
Bang, Hee-Gon (Department of Ceramics Engineering, Kangnung National University)
Park, Sang-Yeup (Department of Ceramics Engineering, Kangnung National University, Technology Innovation Center for Fine Ceramics at Kangnung National University)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.1, 2006 , pp. 48-54 More about this Journal
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 $16.4\times10^{-6}/^{\circ}C\;at\;20\~400^{\circ}C $.
Keywords
Hydroxyapatite; Alumina; Fluoride additives; Phase decomposition;
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