Title

Crack Propagation Resistance of alpha-Al2O3 Reinforced Pulsed Laser-Deposited Hydroxyapatite Coating on 316 Stainless Steel

Authors

Authors

S. Bajpai; A. Gupta; S. K. Pradhan; T. Mandal;K. Balani

Comments

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Abbreviated Journal Title

Jom

Keywords

CARBON NANOTUBE NANOCOMPOSITE; MECHANICAL-PROPERTIES; ALUMINUM-OXIDE; THIN-FILMS; ELECTROPHORETIC DEPOSITION; ABLATION METHOD; PHOSPHATE; BIOCOMPATIBILITY; MICROSTRUCTURE; COMPOSITES; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering; Mineralogy; Mining & Mineral Processing

Abstract

Hydroxyapatite (HA) is a widely used bioceramic known for its chemical similarity with that of bone and teeth (Ca/P ratio of 1.67). But, owing to its extreme brittleness, alpha-Al2O3 is reinforced with HA and processed as a coating via pulsed laser deposition (PLD). Reinforcement of alpha-Al2O3 (50 wt.%) in HA via PLD on 316L steel substrate has shown modulus increase by 4% and hardness increase by 78%, and an improved adhesion strength of 14.2 N (improvement by 118%). Micro-scratching has shown an increase in the coefficient-of-friction from 0.05 (pure HA) to 0.17 (with 50 wt.% Al2O3) with enhancement in the crack propagation resistance (CPR) up to 4.5 times. Strong adherence of PLD HA-Al2O3 coatings (similar to 4.5 times than that of HA coating) is attributed to efficient release of stored tensile strain energy (similar to 17 x 10(-3) J/m(2)) in HA-Al2O3 composites, making it a potential damage-tolerant bone-replacement surface coating.

Journal Title

Jom

Volume

66

Issue/Number

10

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

2095

Last Page

2107

WOS Identifier

WOS:000344617000017

ISSN

1047-4838

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