Effect of Glass Ceramic Crystallinity on the Formation of Simulated Apatite Layers

Abstract:

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In silicate glasses the kinetics of apatite layer formation is usually rapid but the adhesion to the base glass is poor. Glass ceramics promote a stronger bonding between layer and substrate but decrease the rate of the apatite layer formation. In this work a glass of composition (wt%) 54,89%C3P-24,81%SiO2-20,30%MgO has been studied. This glass was heat treated at four temperatures (840 °C, 870 °C, 890 °C and 910 °C) to obtain glass ceramics with different contents of the same crystalline phase. A calcium magnesium phosphate phase was formed in all glass ceramics in a volume percent increasing with temperature. The apatite layer precipitated after immersion in simulated body fluid (SBF) formed faster on the glass than on the glass ceramics and a decrease in the amount of apatite formed was observed with the increase in crystallinity. It was generally concluded that heat treatment can turn a reactive glass into glass ceramics of different surface behaviors, from bioactive to quasi bio inert materials.

Info:

Periodical:

Materials Science Forum (Volumes 514-516)

Edited by:

Paula Maria Vilarinho

Pages:

1039-1043

DOI:

10.4028/www.scientific.net/MSF.514-516.1039

Citation:

N. A.F. Almeida and M. H. F.V. Fernandes, "Effect of Glass Ceramic Crystallinity on the Formation of Simulated Apatite Layers", Materials Science Forum, Vols. 514-516, pp. 1039-1043, 2006

Online since:

May 2006

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$35.00

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