Authors: Hassan Jafari Hamid Hessam Seyed Morteza Ghaffari Shahri Mahtab Assadian Shahin Hamtaie Pour Shairazifard Mohd Hasbullah Idris
Publish Date: 2016/02/16
Volume: 25, Issue: 3, Pages: 901-909
Abstract
In this study solgel dipcoating method was used to coat nanohydroxyapatite on specimens of Ti14Zr13Nb alloy for orthopedic applications The coated specimens were sintered at three different temperatures and time spans to evaluate the impact of sintering process on microstructure mechanical biocorrosion and bioactivity properties of the coating Fieldemission scanning electron microscopy and xray diffraction were used to analyze the coating microstructure Coating adhesion and mechanical performance were also investigated by scratch testing Besides electrochemical corrosion and immersion tests were performed in simulated body fluid to examine the sintering effect on corrosion performance and bioactivity of the coatings respectively The evaluations of coated specimens displayed that sintering at elevated temperatures leads to higher surface integrity and improves crystallinity of the nanohydroxyapatite to approximately 89 which brings about distinctively enhanced mechanical properties Similarly it improved the corrosion rate for about 17 times through sintering at 700 °C Immersion test proved that the coating increased the bioactivity resulted from the dissolution of calcium phosphates into the corresponding environment It is noticeable that sintering the dipcoated specimens in the nanohydroxyapatite improves corrosion performance and maintains bioactive behaviors as wellThe authors would like to acknowledge the Ministry of Higher Education of Malaysia for the financial support Vote number 04H18 faculty of mechanical engineering of the Universiti Teknologi Malaysia for providing research facilities and Shahid Rajaee Teacher Training University for the voluble assistance
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