Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Ca/P Mole Ration on Mechanical Properties of Alumina added Hydroxyapatite

알루미나를 첨가한 Hydroxyapatite의 기계적 물성에 미치는 Ca/P 몰비의 영향

  • Lee, D.Y. (Dept. of Ceramic Eng Yonsei Univ) ;
  • Lee, S.K. (Dept. of Ceramic Eng Yonsei Univ) ;
  • Park, H. (Dept. of Ceramic Eng Yonsei Univ) ;
  • Kim, C.E. (Dept. of Ceramic Eng Yonsei Univ)
  • 이동윤 (연세대학교 요업공학과) ;
  • 이승규 (연세대학교 요업공학과) ;
  • 박훈 (연세대학교 요업공학과) ;
  • 김창은 (연세대학교 요업공학과)
  • Published : 1991.05.01
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Abstract

The effect of Ca/P mole ratio (Ca/P=1.60, 1.67, 1.75) in the initial solution on the mechanical properties of alumina added hydroxyapatite was investigated. Hydroxyapatite was synthesized by precipitation method using Ca(NO3)2$.$4H2O and (NH4)2HPO4 as starting materials and 5 wt% of ${\alpha}$-Al2O3 was added to precipitation solution. The powder was calcined at 800$^{\circ}C$ and sintered at 1,150∼1,400$^{\circ}C$ under water vapor atmosphere. With the increasing of Ca/P mole ration in the initial solution, the amount of tricalcium phosphate formed from the decomposition of hydroxyapatite reduced and the sinterability and mechanical properties were increased. The bending strength and Vickers hardness of the specimen sintered at 1,300$^{\circ}C$ with the Ca/P mole ratio of 1.75 in the initial solution were 230 MPa and 650 kg/$\textrm{mm}^2$, respectively. The improvement of mechanical properties was attributed to not only the effect of Ca/P mole ratio but also the strengthening of sintered body by Al substitution for P ions.

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