Influence of post coating heat treatment on microstructural, mechanical and electrochemical corrosion behaviour of vacuum plasma sprayed reinforced hydroxyapatite coatings

Journal of the Mechanical Behavior of Biomedical Materials
Amardeep SinghVikas Chawla

Abstract

In the present study, reinforced hydroxyapatite (HA) coatings (HA + 10 wt% Al2O3 and HA + 10 wt% ZrO2) were deposited on SS-316 L substrate with an intermediate layer (bond coat) of zirconia by vacuum plasma spray technique. The so-formed reinforced HA coatings were heat treated at 700 °C for 1 h. The influence of post coating heat treatment on phase composition, microstructure, mechanical and electrochemical corrosion properties were investigated. As-sprayed and heat treated coatings were characterized by x-ray diffraction, scanning electron microscope, surface roughness, porosity and crystallinity. Results showed that after post coating heat treatment, the structural integrity of HA has been completely re-established. Moreover, significant drop in porosity has been observed due to the sintering effect produced by heat treatment. Considerable improvement in nanohardness and shear strength was witnessed; however, the nanohardness of top layer was decreased after annealing due to the weak bonding of partially melted and un-melted particles with fully melted splats caused by diffusion process. As-sprayed coatings exhibited higher wear resistance compared to heat treated coatings. Nevertheless, post coating heat treatment effectiv...Continue Reading

Citations

Mar 21, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Lu LiuLunguo Xia
Jun 6, 2019·Materials·Amir Dehghanghadikolaei, Behzad Fotovvati
Apr 14, 2020·Materials Science & Engineering. C, Materials for Biological Applications·Jiayun XuMakoto Otsuka
Jul 14, 2021·ACS Applied Materials & Interfaces·Martin T MatterInge K Herrmann

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