پديد آورنده :
شير محمدي يزدي، سعيد
عنوان :
اصلاح خواص سطحي پوشش هاي نانو ساختار اكسيد آلومينيوم آندي با افزودن لايه روانكار جامد
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب و روش ساخت مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
پانزده،100ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
فخرالدين اشرفي زاده، محمود منير واقفي
استاد مشاور :
كيوان رئيسي
توصيفگر ها :
آندايزينگ , پاي تترافلورواتيلن , ضريب اصطكاك
تاريخ نمايه سازي :
15/4/92
استاد داور :
محمدرضا طرقي نژاد، سعيد رضا بخشي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
106 Improvement of surface properties of nano structured Anodic Aluminum Oxide AAO by addition of solid lubricant layer Saeed Shirmohammadi Yazdi S shirmohammadiyazdi@ma iut ac ir Date of Submission 2013 01 23 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Fakhreddin Ashrafizadeh Prof ashrafif@cc iut ac ir Mahmoud Monirvaghefi Assoc Prof vagh mah@cc iut ac ir Abstract Using aluminum in some applications increases the surface temperature Low hardness along with low wear resistance cause fast failure of the metal Anodizing process in optimized conditions makes a hard alumina coating with hardness values about ten times that of the aluminum substrate but high friction coefficient is a big draw back for this oxide coating The purpose of the present research is to decrease of friction coefficient of AAO Aluminum Anodic Oxide coatings by incorporation of PTFE as a solid lubricant on nanostructured anodic aluminum oxide Hard AAO was made by optimization of voltage and time of the process Then lubricant layers were produced from solutions containing 15 20 25 and 30 ml l PTFE Finally for increasing the PTFE layer adhesion to hard AAO coating heat treatment process was done For characterization of coatings X Ray diffraction XRD Field Emission Scanning Electron Microscope FESEM and Energy Dispersive Spectroscopy EDS were used Experimental results indicated that the size of nano pores were in range of 5 16 nm Heat treatment process was carried out at 400 C for 30 min Changes in nano hardness elastic modulus and fracture toughness evaluated by Atomic Force Microscope AFM A large increase in nano hardness and elastic modulus and a decrease in fracture toughness were observed by heat treatment To study the tribology of the specimens a pin on disc wear tester was employed with AISI 52100 steel pins The tribological behavior at high temperatures was evaluated by wear testing at 150 C and 300 C Weight loss of pin and samples was measured and the effect of temperature on wear behavior was studied It was found that increasing PTFE at room temperature caused a decrease in friction coefficient but this was not true at high temperatures At ambient temperature the best tribological behavior was observed in sample with 30 ml l PTFE but at high temperature in the sample with 20 ml l Wear surfaces of pins and samples were evaluated by Scanning Electron Microscope Keywords Anodizing Aluminum PTFE Solid Lubricant Anodic Oxide Friction Coefficient PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
فخرالدين اشرفي زاده، محمود منير واقفي
استاد مشاور :
كيوان رئيسي
استاد داور :
محمدرضا طرقي نژاد، سعيد رضا بخشي
