3390

3057

كارشناسي ارشد

مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1385

نه، 73، [I] ص.: مصور، جدول، نمودار

ص، ع به فارسي

محمئ حسين فتحي، علي سعيدي

امان الله امين زاده، محمد حسين عنايتي

مهندسي مواد

ID3057

به فارسي و انگليسي: قابل رويت د رنسخه ديجيتالي

AbstractThe organic part of the bone and tooth include crystalline hydroxyapatite Synthetichydroxyapatite is widely used for implant coating and hard tissues substituting Theaims of this work are to synthesis and characterize of the bone like nanocrystallinehydroxyapatite Evaluating the effectiveness of raw materials to form thehydroxyapatite phase micron size calcium carbonate and calcium phosphatedihydrate were used in thermal synthesis at high temperature Reactants were mixedin different molar ratios and then sintered at 1200 C for different times X raydiffraction XRD was used to identify the phases in the bioceramic It was concludedthat in the molar Ca P ratio of 1 67 after 1 hour sintering high crystallinehydroxyapatite was formed Nanocrystalline hydroxyapatite powder was produced by12h milling of the raw materials mixture in a planetary ball mill The results indicatedthat the hydroxyapatite powder has nano scale morphological structure with meangrain size of 29 nm Fourier transform infrared FTIR spectroscopy showed thatsynthesized powder was carbonate substituted similar to the biological apatites Formechanical and physical investigations nanocrystalline powder was pressed to pelletsand sintered at different temperatures Results showed that hydroxyapatite grainsgradually increased in size when temperature increased from 800 C to 1200 C consolidated samples had a density of 83 20 theoretical density and 230 MPacompressive strength In vitro examinations in SBF showed that Ca dissolution rateof nanocrystalline hydroxyapatite was higher than conventional HA and similar tothat for biological apatite of bone owing to its nanostructure and composition

محمئ حسين فتحي، علي سعيدي

امان الله امين زاده، محمد حسين عنايتي