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Synthesis, Sintering and Microstructural Characterization of Nanocrystalline Hydroxyapatite Composites

Published online by Cambridge University Press:  01 February 2011

B. Viswanath
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore, India.
N. Ravishankar
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore, India.
Suprabha Nayar
Affiliation:
National Metallurgical Laboratory, Jamshedpur, India.
Arvind Sinha
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore, India. National Metallurgical Laboratory, Jamshedpur, India.
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Abstract

Nanocrystalline hydroxyapatite (HAp) exhibits better bioactivity and biocompatibility with enhanced mechanical properties compared to the microcrystalline counterpart. In the present work, nanocrystalline hydroxyapatite was synthesized by wet chemical method. Sintering was carried out with nanocrystalline alumina as additive, the content of alumina being varied from 10 to 30 wt% in the composite. For 20 and 30 wt % Al2O3, hydroxyapatite decomposed into tricalcium phosphate (TCP) above the sintering temperature of 1100°C. The fracture toughness of nano HAp-nano Al2O3 composite is anisotropic in nature and reached a maximum value of 6.9 MPa m1/2.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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