Nath, Shekhar and Mukhopadhyay, Anoop Kumar and Dey, A and Basu, Bikramjit (2009) Nanoindentation response of novel hydroxyapatite-mullite composites. Materials Science and Engineering A - Structural Materials Properties Microstructure and Processing , 513-14. pp. 197-201. ISSN 0921-5093

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Abstract

In this contribution, the experimental results of the nanoindentation response of the newly developed hydroxyapatite-mullite composites are presented and analyzed. Three different composite compositions i.e. HAp-10 wt% mullite, HAp-20 wt% mullite and HAp-30 wt% mullite were selected for the present study and for comparison, the measurements on pure HAp and pure mullite were also carried out. For nanoindentation experiments, a maximum load of 100 mN and loading/unloading rate of about 0.2 N/min were used. Also, the multiple indentation experiments were carried out at random locations on polished surfaces and an attempt has been made to explain the difference in the localized mechanical response in terms of the microstructural differences. The obtained results reveal lower hardness of 3-4 GPa for HAp-mullite composites irrespective of mullite content; whereas pure HAp and mullite exhibit higher hardness values of similar to 4.5 GPa and similar to 9 GPa, respectively. Considerable decrease in E-modulus with mullite addition was also noticed. The composites have E-modulus values of similar to 80 GPa, whereas higher values of similar to 125 GPa and 230 GPa were recorded for pure HAp and pure mullite, respectively. Work of indentation for plastic work as well as elastic work are calculated and correlated with hardness and E-modulus values of various samples. (c) 2009 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Nanoindentation; Hydroxyapatite; Hardness; E-modulus
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	29 Feb 2012 12:36
Last Modified:	29 Feb 2012 12:36
URI:	http://cgcri.csircentral.net/id/eprint/1075

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