Characterization of fabricated cobalt-based alloy/nano bioactive glass composites.
In this work, cobalt-based alloy/nano bioactive glass (NBG) composites with 10, 15 and 20wt% NBG were prepared and their bioactivity after immersion in simulated body fluid (SBF) for 1 to 4weeks was studied. Scanning electron microscopy images of two- step sintered composites revealed relatively dense microstructure. The results showed that density of composite samples decreased with increase in NBG amount. The microstructure analysis as well as energy dispersive X-ray analysis (EDX) revealed that small amount of calcium phosphate phases precipitates on the surface of composite samples after 1week immersion in SBF. After 2weeks immersion, considerable amounts of cauliflower-like shaped precipitations were seen on the surface of the composites. Based on EDX analysis, these precipitations were composed mainly from Ca, P and Si. The observed bands in the Fourier transform infrared spectroscopy of immersed composites samples for 4weeks in SBF, were characteristic bands of hydroxyapatite. Therefore it is possible to form hydroxyapatite layer on the surface of composite samples during immersion in SBF. The results indicated that prepared composites unlike cobalt-based alloy are bioactive, promising their possibility for implant applications.
Department of Materials Science and Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran. Electronic address: mr.bafandeh@gmail.com.
Mohammad Reza
MR
Bafandeh
Department of Materials Engineering, Isfahan University of Technology (IUT), Isfahan 84156-83111, Iran.
Raziyeh
R
Gharahkhani
Department of Materials Engineering, Isfahan University of Technology (IUT), Isfahan 84156-83111, Iran.
Mohammad Hossein
MH
Fathi
D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D001826:Body Fluids; D002118:Calcium / Q000032:analysis; D003035:Cobalt / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008422:Materials Testing / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis; D012825:Silicon / Q000032:analysis; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
D000497:Alloys; D001672:Biocompatible Materials; D007477:Ions; D010758:Phosphorus; D003035:Cobalt; D002118:Calcium; D012825:Silicon
Biomaterials; Composite materials; Hydroxyapatite; Microstructure; Sintering