Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Fluoride Additives on Mechanical Properties in Hydroxyapatite/Alumina Composites

수산화아파타이트/알루미나 복합체의 기계적 특성에 미치는 불화물 첨가제의 영향

  • 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)
  • 김성환 (강릉대학교 파인세라믹기술혁신센터) ;
  • 방희곤 (강릉대학교 세라믹공학과) ;
  • 박상엽 (강릉대학교 세라믹공학과, 강릉대학교 파인세라믹기술혁신센터)
  • Published : 2006.01.01
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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 $.

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References

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