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

    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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