5. Synthesis of Nano-Size Hydroxyapatite (HAp) Powders by Mechanical Alloying

  1. Mineo Mizuno
  1. Soon Jik Hong,
  2. Himesh Bhatt,
  3. C. Suryanarayana and
  4. Samar J. Kalita

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291269.ch5

Advances in Bioceramics and Biocomposites: Ceramic Engineering and Science Proceedings, Volume 26, Number 6

Advances in Bioceramics and Biocomposites: Ceramic Engineering and Science Proceedings, Volume 26, Number 6

How to Cite

Hong, S. J., Bhatt, H., Suryanarayana, C. and Kalita, S. J. (2005) Synthesis of Nano-Size Hydroxyapatite (HAp) Powders by Mechanical Alloying, in Advances in Bioceramics and Biocomposites: Ceramic Engineering and Science Proceedings, Volume 26, Number 6 (ed M. Mizuno), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291269.ch5

Author Information

  1. Department of Mechanical, Materials and Aerospace Engineering University of Central Florida Orlando, FL 32816–2450

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982367

Online ISBN: 9780470291269

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Keywords:

  • synthesized;
  • hydmxyapatite;
  • stoichiometric;
  • oxygen;
  • nanocrystalline

Summary

Nano hydroxyapatite (Ca10(PO4)6(OH)2, HAp) powders were synthesized by solid-state reaction of Ca(OH)2 and P2O5 mixtures in a high-energy SPEX 8000 shaker mill, using hardened steel vial and balls. The phase analysis was carried out using X-ray powder diffraction technique. Transformation of Ca(OH)2 and P2O5 mixture to HAp phase was first observed after 1 h of milling. The powder milled for 3 h showed prominently the presence of HAp phase. TEM analysis revealed that as-synthesized HAp powder was in the range of 20–60 nm. Measured quantities of synthesized nano-powders were pressed uniaxially in a steel mold to prepare dense ceramic structures for densification studies. These green structures were subjected to sintering studies at 1300°C for 6 h when the highest sintered density of 3.17 g/cc was achieved.