پديد آورنده :
نجفي بيرگاني، محمد
عنوان :
توسعه پوشش هاي كامپوزيتي ميكروساختار استلايت 6- اكسيد كروم به روش پاشش پلاسمايي اتمسفري
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد
صفحه شمار :
چهارده، 82ص.: مصور
استاد راهنما :
مهدي صالحي
توصيفگر ها :
آزمون سايش , خوردگي دماي بالا
تاريخ نمايه سازي :
1394/08/10
استاد داور :
مسعود عطاپور، مهران نحوي
تاريخ ورود اطلاعات :
1396/10/05
چكيده انگليسي :
83 development of Stellite 6 Chromium oxide composite coatingthermal sprayed with APS method and evaluation of their properties Mohammad Najafi Birgani Mohammad najafi@ma iut ac ir 2015 07 13 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Mehdi Salehi Professor surfacesalehi@hotmail comAbstractIn this study the effect of chromium oxide added to Stellite 6 powder has beeninvestigated To this purpose chromium oxide powders with 10 20 and 30 wt were wellmixed with Stellite 6 and coated on Inconel 617 substrates using plasma sprayingtechnique The X ray diffraction analysis was used to detect the phases formed in powdersand coatings Microstructure porosity and morphology of powders and coatings werestudied by optical microscopy and scanning electron microscopy The hardness of coatingswas investigated by microhardness test In order to characterization of wear resistance ofcoatings the pin on disk test at room and 600 C temperature with 40N load in 1000mdistance was used Moreover cyclic hot corrosion studies were conducted on samples inmolten salt environment at 900 C for 50 hours The results of microhardness tests andphase analysis showed that the hardness of coatings was improved with increase in thecontent of chromium oxide related to the increasing the amount of hard oxide particles The coating with 30 wt chromium oxide indicated the highest wear resistance at roomand high temperatures The investigation of wear traces in contribution with scanningelectron microscopy showed that an oxide layer was formed on worn surface playing a keyrole in reduction of friction coefficient and improvement of wear resistance This oxidelayer was formed better at high temperature In general the wear mechanism was indelamination form The results of hot corrosion tests exhibited that the coating with 30wt chromium oxide had the highest corrosion resistance at high temperature related tothe increase in chromium oxide content Furthermore the increment of weight loss ofaforementioned coating was parabolic Keywords Stellite 6 Chromium oxide Plasma Spray Wear Hot corrosion
استاد راهنما :
مهدي صالحي
استاد داور :
مسعود عطاپور، مهران نحوي
