EFFECT OF CALCINATION ON THE SINTERING BEHAVIOUR OF HYDROXYAPATITE

A wet chemically produced hydroxyapatite (HA) powder was calcined at 700, 800, 900 and 1000 C. The sintering behaviour of these calcined powders was then studied at various temperatures, ranging from 1050 to 1350 C. XRD showed that calcination had no effect on the phase stability of the hydroxyapati...

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Bibliographic Details
Published in:Ceramics (Praha) 2014-01, Vol.58 (4), p.320-325
Main Authors: Teh, Y C, Tan, C Y, Ramesh, S, Purbolaksono, J, Tan, Y M, Chandran, H, Teng, W D, Yap, B K
Format: Article
Language:English
Subjects:
Calcination
Coarsening
Density
Hydroxyapatite
Powder Morphology
Roasting
Sintering
Sintering (powder metallurgy)
Specific surface
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Summary:A wet chemically produced hydroxyapatite (HA) powder was calcined at 700, 800, 900 and 1000 C. The sintering behaviour of these calcined powders was then studied at various temperatures, ranging from 1050 to 1350 C. XRD showed that calcination had no effect on the phase stability of the hydroxyapatite. However, the XRD peaks showed that the crystallinity of the powder increased with increasing calcination temperature. The specific surface area of powder reduced drastically from 60.74 m2/g to 9.45 m2/g with increasing calcination temperature. SEM of the calcined powder showed the coarsening of powder particles as the calcination temperature increased. In terms of sinterability, the uncalcined HA powder sintered at 1150 C had the optimum properties: about 99% relative density, Vickers hardness of 7.23 GPa and fracture toughness of 1.12 MPa.m1/2. The research indicated that calcination of the HA powder prior to sintering had a negligible effect on the sintering behaviour of the HA compacts and that calcination at 1000 C was found to be unfavourable to the properties of sintered HA.
ISSN:0862-5468
1804-5847