Synthesis and sintering of hydroxyapatitex2013;zirconia composites

Rao, R Ramachandra and Kannan, KS (2002) Synthesis and sintering of hydroxyapatitex2013;zirconia composites. Materials Science and Engineering C, 20 (1-2). pp. 187-193.

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Abstract

Hydroxyapatite (HA) has been synthesised in presence of 10x2013;30 wt.% of m-ZrO2 by solid state reaction between tricalcium phosphate (TCP) and Ca(OH)2 at 1000 xB0;C for 8 h. The m-ZrO2 was partly converted into t-ZrO2 by partial consumption of CaO which in turn resulted in a mixture of h-TCP and HA. On sintering these HAx2013;h-TCPx2013;ZrO2 composite powders at 1100x2013;1400 xB0;C for 2 h, the HA is further decomposed into h-TCP and CaO. The CaO so produced reacts further with m-ZrO 2/t-ZrO2 generating a mixture of t-ZrO2 and CaZrO3 in different proportions. These various phases formed interfere with the sinterability of the composites due to their differential shrinkages leading to a overall reduced density as compared to that of pure HA. The composites show a T-onset of decomposition at around 1150 xB0;C and a 40% HA yield was obtained at the highest sintering temperature of 1400 xB0;C. The products were subjected to XRD for phase analysis and the microstructural features were studied by SEM.

Item Type: Article
Additional Information: Copyright belongs to Elsevier Science Ltd.,
Uncontrolled Keywords: Hydroxyapatite;Hydroxyapatitex2013;zirconia;Composites;Sintering
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Users 20 not found.
Date Deposited: 12 Jun 2006
Last Modified: 03 May 2012 10:41
URI: http://nal-ir.nal.res.in/id/eprint/1496

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