Thermal and chemical stability of fluoro-hydroxyapatite ceramics with different fluorine contents
Hydroxyapatite (HA) plays an important role in orthopedics and dentistry due to its excellent bioactivity. However, the thermal decomposition and the poor corrosion resistance in an acid environment have restricted the applications of hydroxyapatite. In this study several fluorine-substituted hydroxyapatite (FHA) ceramics with the general chemical formula of Ca10(PO4)6(OH)2-2xF2x, where x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, were prepared. Thermogravimetric analysis in the temperature range from 25oC to 1400oC showed that the FHA ceramics with x > 0.4 had remarkably improved thermal stability as compared to pure HA. X-ray diffraction of the FHA ceramics sintered at 1300oC for 1 hour further confirmed the thermal stability. Dilatometer analysis showed that the fluorine addition substantially increased the onset sintering temperature of the FHA ceramics. Density measurements showed that the fluorine addition into the HA matrices slightly retarded the densification of the FHA ceramics. Corrosion testing on the polished surfaces of the FHA ceramics using a 2.5 wt% citric acid solution indicated that the FHA ceramics with x 0.4 had substantially improved corrosion resistance.
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|Item Type:||Journal Article|
|Keywords:||Hydroxyapatite, Fluoroapatite, Chemical Stability, Thermal Decomposition, Fluorine|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2005 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||30 Mar 2007|
|Last Modified:||29 Feb 2012 13:28|
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