Hydroxyapatite Formation on Fluoride Bioactive Glasses coated on Alumina

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J. Korean Ceram. Soc. > Volume 36(10); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(10): 1087.

알루미나에 코팅된 불화물 생체유리에의 수산화 아파타이트 형성

안현수, 이은성, 김철영

인하대학교 무기재료공학과

Hydroxyapatite Formation on Fluoride Bioactive Glasses coated on Alumina

ABSTRACT

Bioglass which is one of the surface active bionmaterials has a good biocompatibility but a poor mechanical strength, In the present work therefore two types of fluoride-containing bioglasses were coated on an alumina to improve mechanical strength. Crystallization of the coating layer and the hydroxyapatite formation on the bioactive glass coatings in tris-buffer solution were studied. When bioactive glass coated alumina was heat-treated Na2CaSi3O8 crystal was formed on the layer at lower temperature while wollastonite(CaSIO3) was obtained at higher temperature. Hydroxyapatite forming rate on the coating layer with Na2CaSi3O8 crystal was delayed with SiO2 contents in glass composition. However the hydroxyapatite was developed in 20minutes regardless SiO2 contents when the coating layer crystallized into wollastonite. More amount of P3+ ions were leached out of the coating layer with wollastonite than that with Na2CaSi3O8 crystal while Na+ and Ca2+ ions were leached out more easily from the Na2CaSi3O8 crystal containing coating layer.

Key words: Hydroxyapatite, Bioactive glass, Alumina, Wollastonite, Tris-buffer solution, Leaching