Title

Crack Propagation Resistance Of Α-Al2O3 Reinforced Pulsed Laser-Deposited Hydroxyapatite Coating On 316 Stainless Steel

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, α-Al2O3 is reinforced with HA and processed as a coating via pulsed laser deposition (PLD). Reinforcement of α-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 (~4.5 times than that of HA coating) is attributed to efficient release of stored tensile strain energy (~17 × 10−3 J/m2) in HA–Al2O3 composites, making it a potential damage-tolerant bone-replacement surface coating.

Publication Date

10-4-2014

Publication Title

JOM

Volume

66

Issue

10

Number of Pages

2095-2107

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11837-014-1152-3

Socpus ID

84910145449 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84910145449

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