Title

Boron nitride nanotube reinforced hydroxyapatite composite: Mechanical and tribological performance and in-vitro biocompatibility to osteoblasts

Authors

Authors

D. Lahiri; V. Singh; A. P. Benaduce; S. Seal; L. Kos;A. Agarwal

Comments

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Abbreviated Journal Title

J. Mech. Behav. Biomed. Mater.

Keywords

SPARK PLASMA; CARBON NANOTUBES; ELASTIC-MODULUS; STABILIZED ZIRCONIA; BEHAVIOR; COATINGS; MICROSTRUCTURE; POWDERS; CONSOLIDATION; FABRICATION; Engineering, Biomedical; Materials Science, Biomaterials

Abstract

This study proposes boron nitride nanotube (BNNT) reinforced hydroxyapatite (HA) as a novel composite material for orthopedic implant applications. The spark plasma sintered (SPS) composite structure shows higher density compared to HA. Minimal lattice mismatch between HA and BNNT leads to coherent bonding and strong interface. HA-4 wt% BNNT composite offers excellent mechanical properties-120% increment in elastic modulus, 129% higher hardness and 86% more fracture toughness, as compared to HA. Improvements in the hardness and fracture toughness are related to grain refinement and crack bridging by BNNTs. HA-BNNT composite also shows 75% improvement in the wear resistance. The wear morphology suggests localized plastic deformation supported by the sliding of outer walls of BNNT. Osteoblast proliferation and cell viability show no adverse effect of BNNT addition. HA-BNNT composite is, thus, envisioned as a potential material for stronger orthopedic implants. (C) 2010 Elsevier Ltd. All rights reserved.

Journal Title

Journal of the Mechanical Behavior of Biomedical Materials

Volume

4

Issue/Number

1

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

44

Last Page

56

WOS Identifier

WOS:000286126400006

ISSN

1751-6161

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