title: The effect of nanobioceramic reinforcement on mechanical and biological properties of Co-base alloy/hydroxyapatite nanocomposite.
abstract: The goal of the present research was to fabricate, characterize, and evaluate mechanical and biological properties of Co-base alloy composites with different amounts of hydroxyapatite (HA) nanopowder reinforcement. The powder of Co-Cr-Mo alloy was mixed with different amounts of HA by ball milling and it was then cold pressed and sintered. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used. Microhardness measurement and compressive tests were also carried out. Bioactivity behavior was evaluated in simulated body fluid (SBF). A significant decrease in modulus elasticity and an increase in microhardness of the sintered composites were observed. Apatite formation on the surface of the composites showed that it could successfully convert bioinert Co-Cr-Mo alloy to bioactive type by adding 10, 15, and 20wt.% HA which have lower modulus elasticity and higher microhardness.
authors.affiliation: Biomaterials Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran. Electronic address: m.bahrami@ma.iut.ac.ir.
authors.forename: M
authors.initials: M
authors.lastname: Bahrami
authors.affiliation: Biomaterials Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: M H
authors.initials: MH
authors.lastname: Fathi
authors.affiliation: Biomaterials Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Ahmadian
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D055119:Elastic Modulus; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size
chemical_list: D000497:Alloys; D003035:Cobalt; D017886:Durapatite
keywords: Bioactivity; Co–Cr–Mo alloy; Hydroxyapatite bioceramic; Mechanical properties; Nanocomposite