Twinning induced enhancement of fracture toughness in ultrafine grained Hydroxyapatite-Calcium Titanate composites

Ravikumar, K and Mallik, Prafulla Kumar and Basu, Bikramjit (2016) Twinning induced enhancement of fracture toughness in ultrafine grained Hydroxyapatite-Calcium Titanate composites. In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 36 (3). pp. 805-815.

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Abstract

Despite being highly bioactive and biocompatible, the limitations of monolithic hydroxyapatite (HA) include extremely low fracture toughness, poor electrical conductivity. While addressing these issues, the present study demonstrates how CaTiO3 (CT) addition to HA can be utilized to obtain a combination of long crack fracture toughness (1.7 MPa m(1/2) SEVNB technique) and flexural strength of 98-155 MPa (3-point bending) and a moderate tensile strength (diametral compression) of 17-36 MPa. The enhancement in fracture resistance in spark plasma sintered HA-CT composites has been explained in reference to the observed twin morphology. TEM reveals the presence of twins in CT grains due to 1800 rotation about 101]. The measured properties along with our earlier reports on biocompatibility and electrical properties make HA-CT suitable for bone tissue engineering applications. When compared with other competing HA-based biocomposites, HA-CT composites are found to have a better combination of properties useful for medium load bearing implant applications. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	Hydroxyapatite; CaTiO3; Biocomposite; SEVNB fracture toughness; Twin-toughening; Microstructure-property correlation
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	28 Jan 2016 05:42
Last Modified:	28 Jan 2016 05:42
URI:	http://eprints.iisc.ac.in/id/eprint/53163

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