Nanosized hydroxyapatite powders derived from coprecipitation process

Nanosized hydoxyapatite (Ca10(PO4)6(OH)2 or HA) powders were prepared by a coprecipitation process using calcium nitrate and phosphoric acid as starting materials. The synthesized powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BE...

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Bibliographic Details
Published in:Journal of materials science 2002-03, Vol.37 (6), p.1131-1134
Main Authors: KONG, L. B, MA, J, BOEY, F
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Calcium nitrate
Calcium phosphates
Ceramic industries
Ceramic powders
Ceramics
Chemical industry and chemicals
Coarsening
Coprecipitation
Exact sciences and technology
Grain size
Hydroxyapatite
Materials science
Miscellaneous
Phosphoric acid
Scanning electron microscopy
Sintering
Sintering (powder metallurgy)
Technical ceramics
Theoretical density
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Summary:Nanosized hydoxyapatite (Ca10(PO4)6(OH)2 or HA) powders were prepared by a coprecipitation process using calcium nitrate and phosphoric acid as starting materials. The synthesized powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) specific area measurment techniques. Single phase HA, with an average grain size of about 60 nm and a BET surface area of 62 m2/g, was obtained. No grain coarsening was observed when the HA powders were heated at 600°C for 4 hours. HA ceramics were obtained by sintering the powders at temperatures from 1000°C to 1200°C. Dense HA ceramics with a theoretical density of 98% and grain size of 6.5 μm were achieved after sintering the HA powders at 1200°C for 2 hours. HA phase was observed to decompose into tricalcium phosphate when sintered at 1300°C. The microstructure development of the sintered HA ceramics with sintering temperature was also characterized and discussed.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1014355103125