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Synthesis and characterization of machinable calcium phosphate/lanthanum phosphate composites

✍ Scribed by Celaletdin Ergun

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
980 KB
Volume
199
Category
Article
ISSN
0924-0136

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✦ Synopsis

Hydroxylapatite (HA) and tricalcium phosphate (TCP) composites with lanthanum phosphate were prepared with pressureless air sintering at 500, 700, 900, 1100 and 1300 β€’ C for 2 h. The composites were characterized in terms of phase stability during sintering, microstructural evaluation with XRD, SEM and machinability with simple drilling operation.

At sintering temperatures higher than 700 β€’ C, hydroxylapatite and lanthanum phosphate phases reacted and formed Ca 8 La 2 (PO 4 ) 6 O 2 . On the other hand, tricalcium phosphate and lanthanum phosphate composites were stable up to 1100 β€’ C. However, partial reaction was observed during sintering at 1300 β€’ C. As a result, tricalcium phosphate and lanthanum phosphate composites sintered at 1100 β€’ C showed phase stability insuring weak interface. Thus, these composites fulfilled the requirement for machinability.

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