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- Title
Crack Propagation Resistance of α-AlO Reinforced Pulsed Laser-Deposited Hydroxyapatite Coating on 316 Stainless Steel.
- Authors
Bajpai, Shubhra; Gupta, Ankur; Pradhan, Siddhartha; Mandal, Tapendu; Balani, Kantesh
- 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-AlO is reinforced with HA and processed as a coating via pulsed laser deposition (PLD). Reinforcement of α-AlO (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.% AlO) with enhancement in the crack propagation resistance (CPR) up to 4.5 times. Strong adherence of PLD HA-AlO coatings (~4.5 times than that of HA coating) is attributed to efficient release of stored tensile strain energy (~17 × 10 J/m) in HA-AlO composites, making it a potential damage-tolerant bone-replacement surface coating.
- Subjects
HYDROXYAPATITE; BIOCERAMICS; BONES; TEETH; PULSED laser deposition
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2014, Vol 66, Issue 10, p2095
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-014-1152-3