Paper Title:
Effect of Glass Ceramic Crystallinity on the Formation of Simulated Apatite Layers
  Abstract

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, 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
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: B.J.M. Leite Ferreira, M.G.G.M. Duarte, M. Helena Gil, Rui N. Correia, J. Román, Maria Vallet-Regí
581
Authors: Akemi A. Nogiwa-Valdez, Dora A. Cortés-Hernández, J.M. Almanza-Robles, Alejandra Chávez-Valdez
Abstract:Zirconia-alumina composites with additions of a CaO-SiO2 glass are prepared by uniaxial pressing and sintering. In order to promote...
193
Authors: El-Sayed Ghaith, Toshihiro Kasuga, Masayuki Nogami
Abstract:Amorphous calcium silicate coating on a metallic titanium substrate for hard tissue replacement was prepared by a sol-gel method. Calcium...
235
Authors: Hua Ke, Yu Zhou, De Chang Jia, Cong Qin Ning
Abstract:Hydroxyapatite (HA)/titanium (Ti) composites were successfully fabricated by hot isostatic pressing at 850°C. The microstructure of 7T2HB...
1715
Authors: Gultekin Goller, Ipek Akin
Abstract:The aim of this study is to investigate the crystallization behavior and in-vitro bioactivity character of glass ceramics having 3:7 weight...
261