پديد آورنده :
زماني، روح اله
عنوان :
توليد و مشخصه يابي نانو كامپوزيت مولايت-زير كونيا
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مهندسي مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
دوازده، 84ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
رحمت اله عمادي، غلامرضا آريانپور
استاد مشاور :
حميدرضا سليمي
توصيفگر ها :
فعال سازي مكانيكي
تاريخ نمايه سازي :
31/2/91
استاد داور :
احمد منشي، ايمان مباشرپور
تاريخ ورود اطلاعات :
1396/10/06
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Fabrication and Characterization of Mullite Zirconia Nano Composite Rooholah Zamani r zamany65@yahoo com March 9 2012 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor R Emadi remadi@cc iut ac ir AbstractMullite is one of the most important ceramics that show high temperature strength and corrosion propertywith a good creep resistance However the application of mullite is limited by low sinterability formation athigh temperature and low ductility One of the methods for improving physical and mechanical property ofmullite is composite formation with Zirconia Zirconia Mullite ZrO2 3 Al2O3 2 SiO2 composites arerefractory materials widely employed in many industries Thermal shock behaviour of these materials mustbe considered because it is sometimes its failure mechanism Low cost Mullite Zirconia composites wereprepared from the mixtures of natural alumina and zircon Available evidences indicate that at final stage ofmullization or diffusion process through mullite layer might control mullite grain growth Thiscomposite is often produced by reaction sintering that needs to high temperature and time The aim of thisproject was synthesis and characterization of Mullite zirconia composite by mechanical activation Thematerial used in this study was calcin alumina reactive alumina zircon Ammonium fluoride and ammoniumchloride Ammonium fluoride and ammonium chloride were used as materials for improving the reaction As received materials were mixed according to stochiometric ratio and then heattreated to form Mullite zirconia composite The effect of activation time heat treatment temperature and using of ammoniumfluoride and ammonium chloride on the phase transformation and crystallite size of the composite wereinvestigated X Ray Diffraction XRD were used to detect the phase transformation during mechanicalactivation and heat treatment Scanning Electron Microscope was used to study the microstructure andmorphology of powders and compact samples EDS was also used to detect the elemental change in differentphases The result showed that without the presence of F and Cl ions the Mullite zirconia nanocompositewas successfully synthesized with a crystallite size of Mullite 35nm and Zirconia 40nm after 40h ofmechanical activation and 4h heat treatment of calcinate alumina and zircon at 1400 0C Also thisnanocomposite was synthesized by mechanical activation and 4h heat treatment of reactive alumina andzircon at 1400 0C but with remained zircon The presence of F and Cl ions were caused to reduction offormation time But the crystallite size of synthesised composite was increased due to the change information mechanism in the presence of ammonium fluoride Mullite Zirconia nanocomposite wassynthesized with a crystallite size of Mullite 65nm and Zirconia 50nm after 20h mechanical activation ofcalcinate alumina and ziron and 4h heat treatment at 1400 C Also in the presence of ammonium chlorideMullite Zirconia nanocomposite was synthesized after 20h mechanical activation of calcinate alumina andziron and 4h heat treatment at 1400 C but with some not reacted alumina Key wordsMullite Nano Composite Zirconia Mechanical Activation
استاد راهنما :
رحمت اله عمادي، غلامرضا آريانپور
استاد مشاور :
حميدرضا سليمي
استاد داور :
احمد منشي، ايمان مباشرپور
