پديد آورنده :
ياراحمديان، ريحانه
عنوان :
ساخت و مشخصه يابي تيتانات كلسيم بالك نانو ساختار براي كاربردهاي پزشكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
دوازده، 87ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
محمدحسين فتحي، مهدي احمديان
توصيفگر ها :
تف جوشي دو مرحله اي
تاريخ نمايه سازي :
3/10/91
استاد داور :
رحمت اله عمادي، محمد رفيعي نيا
تاريخ ورود اطلاعات :
1396/09/22
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Fabrication and Characterization of Nanostructured Bulk Calcium titanate For Biomedical Applications Reyhaneh Yarahmadian Reyhanehyarahmadian@yahoo com Date of submission May 20 2012 Department of Meaterials Enginnering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mohammad Hossain Fathi Fathi@cc iut ac ir Mehdi Ahmadian ahmadian@cc iut ac ir Abstract Calcium titanate CaTiO3 is a new bioceramic for its good mechanical properties and piezoelectrict effect Calcium titanate is a bioceramic used for femoral implacement to improve osteointegration Better properties of nanosized materials in contrary to micrometer materials cause that biomedical experts used it to produce biomedicals The goal of this research is to synthesize calcium titanate powder with two methods sol gel and mechanical alloying and then to fabricate nanostructured bulk calcium titanate for biomedical applications The methods of manufacturing nanostructured materials are different and they can include spark plasma sintering hot pressing and two step sintering Two step sintering method is a example of a multivariable process that demands important resource and time consuming efforts in order to optimize firing schedules Most of researchers apply this process based on try and error method When the number of factors and parameters settings is high the experimental plan yields an under number of experiments Nevertheless experimental planning may be optimized based on portial factorial experimental plans Among the existing methods the Taguchi approach is particulary attractive for simplicity and clarity of use it This work presents an integrated approach to assess optima two steo sintering scheduals of calcium titanate that combins predictions of the sintering kinetics based on conventional sintering data with taguchi fractional experimental plans In the present study two step sintering method has been applied to suppress the accelerated grain growth of nanostructured calcium titanate in the last sintering stage This method includes heating up to a higher temperature T1 cooling down to a lower temperature T2 holding for a instant time in this temperature t2 It was shown by application of two step sintering method the final grain size of calcium titanate maintain lower than 100nm while by application of conventional sintering it reaches higher than 100nm XRD SEM TEM and EDS applied to study the structure and morphology of calcium titanate powder and bulk calcium titantate To find how important the temperatures at sintering steps might be several TSS regime were conducted The results showed that the temperatures were critical at both sintering stages The changes of compressive strength hardnees and fracture toughness of bulk calcium titanate under different regims of two step sintering were studied Bioactive properties cytotoxicity and cells adhesion of bulk calcium
استاد راهنما :
محمدحسين فتحي، مهدي احمديان
استاد داور :
رحمت اله عمادي، محمد رفيعي نيا
