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J. Korean Ceram. Soc. > Volume 33(9); 1996 > Article
Journal of the Korean Ceramic Society 1996;33(9): 1003.
Citrate법을 이용한 수산화아파타이트 분말합성 및 소결특성
임병일, 최세영1, 정형진, 정형진, 오영제
한국과학기술원 세라믹연구부
1연세대학교 세라믹공학과
Powder Synthesis and Sintering Behavior of Hydroxyapatite by Citrate Method
Hydroxyapatite powder was synthesized by a citrate method, . Char-like precursor composed of Ca8(HPO4)2(PO4)4.5H2O (OCP) and CaCo3 was found via viscous resin-like intermediate by heating the mixed aqueous solution of Ca(NO3)2.4H2O(NH4)2HPO4 and citric acid. Resulted powder was transformed into hydroxyapatite phase by firing over 120$0^{circ}C$-135$0^{circ}C$ for 4 hr using the powder calcined at 90$0^{circ}C$ for 10 hr composed of mostly single hydroxyapatite phase. The sintered densities increased with firing temperature up to 130$0^{circ}C$ but the highest relative density was about 94% of theoritical value. indicating the presence of closed pores. The maximum 96 MPa of flexural strength was obtained at 120$0^{circ}C$ firing but the flexural strength showed lower values over the above sintering condition. Vitro test was performed by immersing of two jointed specimens in SBF for seven days and adhesion was observed between two specimens.
Key words: Hydroxyapatite, Citrate method, OCP, Flexural strengh, Adhesion test
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