پديد آورنده :
داعي، شيواسادات
عنوان :
ساخت، مشخصه يابي و ارزيابي مقايسه اي پوشش هاي نانو كامپوزيتي هيدروكسي آپاتيت - تيتانات كلسيم و هيدروكسي آپاتيت - تيتانات باريم براي بهبود زيست سازگاري فولاد زنگ نزن 316ال
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب و روش ساخت مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
پانزده، 75ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
فخرالدين اشرفي زاده، محمدحسين فتحي
تاريخ نمايه سازي :
3/3/94
استاد داور :
حميدرضا سليمي، مهشيد خرازيها
تاريخ ورود اطلاعات :
1396/10/02
چكيده انگليسي :
76 Fabrication Characterization and Comparative Evaluation of Hydroxyapatite Calcium titanate and Hydroxyapatite Barium titanate Nanocomposite Coatings for Biocompatibility Improvement of Stainless Steel 316L Substrate Shiva Sadat Daee Ss daee@ma iut ac ir Date of Submission 9 22 2014 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors F Ashrafizadeh ProfessorM H Fathi ProfessorAbstractDespite considerable biocompatibility of hydroxyapatite bioceramic its application islimited due to poor mechanical properties This problem can be solved through theproduction of composites with other ceramics such as the titanates In the present study calcium titanate and barium titanate nanopowders were prepared by sol gel method andnanocomposite coatings of hydroxyapatite calcium titanate and hydroxyapatite bariumtitanate were then made by deep coating method and characterized To produce coatingswith the best properties 10 20 and 30 wt of calcium titanate particles as reinforcementwere distributed in hydroxyapatite matrix Structure and morphology of the nanopowdersand coatings were investigated using X ray diffraction analysis XRD scanning electronmicroscopy SEM transmission electron microscopy TEM and energy dispersive X rayspectroscopy EDX In order to evaluate the bioactivity the coated samples wereimmersed in the simulated body fluid for 3 7 14 and 28 days at 37 C To evaluate thecorrosion behavior especially pitting corrosion of coated and primary uncoated samples the electrochemical corrosion tests were used The mechanical properties of coatings werealso investigated using nano indentation tests The results from the present investigationconfirmed that the nanoparticles were successfully formed and the suitable amount ofreinforcement used in the hydroxyapatite matrix was 20 wt The dense homogeneousand crack free coatings were obtained Bioactivity evaluation showed that after immersionof the coated samples in the simulated body fluid within the specified time apatite formedon the surface of the coating increases with increasing immersion time which is adequateproof of bioactivity Nano indentation tests also implied an increase in the mechanicalproperties of the composite coatings such as hardness and elastic modulus compared withthe single phase hydroxyapatite coating The results of electrochemical corrosion testsshowed that the coatings protect the substrate by creating a mechanical barrier whichincreases corrosion resistance and reduces susceptibility to pitting By comparing theeffects of adding calcium titanate and barium titanate on the properties of the coatings itwas found that better properties were achieved by barium titanate The results confirm thathydroxyapatite calcium titanate and hydroxyapatite barium titanate composite coatingsreveal promising characteristics as candidates to be used for medical applications Keywords Hydroxyapatite Calcium titanate Barium titanate Nanocomposite Coating Sol gel
استاد راهنما :
فخرالدين اشرفي زاده، محمدحسين فتحي
استاد داور :
حميدرضا سليمي، مهشيد خرازيها
