Effect of Ca/P Mole Ratio on the Sintering of Hydroxyapatite Powders Synthesized by the Wet Method and its Microstructure

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J. Korean Ceram. Soc. > Volume 26(1); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(1): 123.

습식법으로 제조한 수산화아파타이트 분말의 소결과 그 미세구조에 미치는 Ca/P몰비의 영향

신용규, 정형진, 김병호¹

한국과학기술원 무기재료연구실
¹고려대학교 재료공학과

Effect of Ca/P Mole Ratio on the Sintering of Hydroxyapatite Powders Synthesized by the Wet Method and its Microstructure

ABSTRACT

Hydroxyapatite powders were syntehsized by the reaction of Ca(NO3)2.4H2O and (NH4)2HPO4 in aqueous solution. The effect of the Ca/P mole ratio in the starting solution on the sintering of the powders and its microstructure was studied. When the Ca/P mole ratio in the starting solution was 1.69, the relative density of the sintered bodies was more than 95%. The sinterability was decreased as the Ca/P mole ratio in the starting solution was increased (Ca/P mole ratio >1.67). Hydroxyapatite sintered bodies obtained from the Ca/P mole ratio=1.69 had very excellent bending strength. The best bending strength was obtained at 110$0^{circ}C$ and its value was 1220kg/$textrm{cm}^2$. The average grain size was 0.277${mu}{textrm}{m}$. Most of sintered bodies were almost shown 100% hydroxyapatite phase. However, in case of the Ca/P mole ratio=1.64 hydroxyapatite was decomposed to $alpha$-whitlockite above 120$0^{circ}C$.