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Proceedings Paper

The influence of Ca/P ratio on the properties of hydroxyapatite bioceramics
Author(s): S. Ramesh; C. Y. Tan; M. Hamdi; I. Sopyan; W. D. Teng
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Paper Abstract

The paper reports on the effect of Ca/P ratio (1.57, 1.67 and 1.87) on the densification behaviour of nanocrystalline hydroxyapatite (HA) prepared by a chemical precipitation method. Green compacts were prepared and sintered at temperatures ranging from 1000°C to 1350°C. The sintered samples were characterized to determine the HA phase stability, bulk density, hardness, fracture toughness and Young's modulus. XRD analysis revealed that the phase stability was not disrupted throughout the sintering regime employed for HA having Ca/P ratio of 1.57 and 1.67. However, secondary phases were observed for HA having a Ca/P ratio of 1.87 when sintered at high temperatures. In general, regardless of Ca/P ratio, the HA bodies achieved > 95% relative density when sintered at 1100°C-1250°C. The results indicated that the stoichiometric HA (Ca/P ratio = 1.67) exhibited the overall best properties, with the highest hardness of 7.23 GPa and fracture toughness of 1.28 MPam1/2 being attained when sintered at 1000°C-1050°C.

Paper Details

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64233A (1 November 2007); doi: 10.1117/12.779890
Show Author Affiliations
S. Ramesh, Univ. Tenaga Nasional (Malaysia)
C. Y. Tan, Univ. Malaya (Malaysia)
M. Hamdi, Univ. Malaya (Malaysia)
I. Sopyan, International Islamic Univ. (Malaysia)
W. D. Teng, SIRIM Berhad (Malaysia)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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