Investigation of Bioactivity Properties of Nanocomposite NHA/ Diopside Densified by Two Steps Sintered to Use in Medical Applications

Subject Areas :

نسرین رفیعی ¹ ( دانشگاه آزاد اسلامی واحد شهرضا )
Ebrahim Karamian ² ( استادیار، مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی )

Received: 2015-07-21 Accepted : 2016-09-13 Published : 2016-08-22

Keywords: Diopside, Two-Steps Sintering, Bioactivity, Natural Hydroxyapetite,

Abstract :

In this study, to achieve the appropriate composite of natural apatite-diopside with desired bioactivity properties, the various compounds containing 10, 20, 30 and 40 wt.% diopside were prepared and compressed under the two-steps sintering heat treatment. Then the mechanical strength, density and bioactivity of the samples were evaluated. Scanning Electron Microscope (SEM), X-ray energy dispersion spectroscopy (EDS) and X-ray diffraction analysis (XRD) were used in order to samples' characterization. Results showed that the sample with 20 wt.% diopside had the highest strength (63 MPa), and the SEM images and EDS spectrum confirmed that the apatite diposits is formed on the surface of this sample after 28 days immersion in simulated body solution (SBF). Ion measurment showed the decrease in concentration of Ca ions from 100 to 93 ppm and P ions from 31 to 28 ppm which indicates the formation of apatite on the sample. By considering the obtained results, the composite sample containing 20 wt.% diopside and 80 wt.% natural hydroxyapatite as a ceramic nanobiocomposite with desirable mechanical properties along with appropriate bioactivity could be introduced for medical purposes such as orthopedic.

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