پديد آورنده :
موحدي، بهروز
عنوان :
ارزيابي ساختاري و رفتاري تريبولوژيكي پوشش هاي نوين پاشش حرارتي آمورف - نانو كريستال پايه آهن
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان،دانشكده مهندسي مواد
صفحه شمار :
نه، 194 ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
محمد حسين عنايتي
استاد مشاور :
مهدي صالحي، ونگ چي چونگ
توصيفگر ها :
آلياژ آمورف پايه آهن , كريستاليزسيون , آلياژ سازي مكانيكي
تاريخ نمايه سازي :
22/2/1389
استاد داور :
علي رضا صبورروح اقدم، فرشاد اخلاقي، مسعود پنجه پور
كد ايرانداك :
ID304 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
1 Microstructural and Tribological Evaluation of Novel Fe based Amorphous Nanocrystalline Thermal Spray Coatings Behrooz Movahedi movahedi@ma iut ac ir March 09 2010 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran M H Enayati1 ena78@cc iut ac ir M Salehi1 Advisor C C Wong2 Advisor M Shamanian Graduate coordinator Abstract The application of amorphous and nanocrystalline layers on metal substrates is an important method to improve surface performance of engineering parts In this work a new composition of Fe 15Cr 4Mo 5P 4B 1C 1Si wt amorphous powder was produced by mechanical alloying MA of elemental powder mixtures and then thermal spraying of this powder was done by high velocity oxy fuel HVOF technique at various spraying condition to obtain the desirable amorphous and nanocrystalline structures The microstructure thermal properties and wear resistance of Fe based amorphous nanocrystalline powder particles as well as HVOF coatings were investigated by X ray diffractometry XRD scanning electron microscopy SEM transmission electron microscopy TEM and differential scanning calorimetry DSC The results suggest that one exothermic peak was observed on DSC traces implying that the crystallization process undergoes only one stage It was found that the amorphization starts at the edge of particles and progress into the internal regions as MA proceeds Increasing milling time to 80 h yielded a fully amorphous structure Thermal spray coatings show that by adjusting the HVOF parameters especially fuel oxygen ratio and proper selection of powder composition the desired microstructure with different amount of amorphous and nanocrystalline phases and therefore with different wear properties could be obtained Wear test showed that amorphous coatings have lowest friction coefficient 0 18 in comparison with crystalline coatings Keywords amorphous nanocrystalline mechanical alloying thermal spray wear resistance 1 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran 2 School of Materials Science and Engineering Nanyang Technological University Singapore 639798
استاد راهنما :
محمد حسين عنايتي
استاد مشاور :
مهدي صالحي، ونگ چي چونگ
استاد داور :
علي رضا صبورروح اقدم، فرشاد اخلاقي، مسعود پنجه پور
