پديد آورنده :
اشرف زاده، ميلاد
عنوان :
بررسي اثر فرايند فعال سازي مكانيكي-حرارتي بر تشكيل كاربيد آهن از طريق احياي كربوترمي هماتيت
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
[پانزده]، 86ص.: مصور﴿رنگي﴾، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
مسعود پنجه پور، مرتضي شمعانيان اصفهاني
توصيفگر ها :
آسيا كاري د اغ , گرافيت ,
تاريخ نمايه سازي :
3/10/91
استاد داور :
محمود مرآتيان، مهدي احمديان نجف آبادي
تاريخ ورود اطلاعات :
1396/09/22
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
87 To Study the Effect of Mechanical thermal Activation Process on Iron Carbide Formation by Carbothermic Reduction of Hematite Ashrafzadeh Milad m ashrafzadeh@ma iut ac ir April 18 2012 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Dr Masoud Panjepour Assist Prof Supervisor Email panjepour@cc iut ac ir Dr Morteza Shamanian Assoc Prof Supervisor Email shamanian@cc iut ac ir Abstract Recently effect of mechanical activation on carbothermic reduction of hematite and production of cementite from mixed iron graphite has been investigated Results showed that mechanical activation with powerful ball milling in long time reduced the temperature of reduction reaction and construction of iron carbide occurred in fewer temperature In this research the effect of mechanical thermal activation process on iron carbide formation by carbothermic reduction of hematite was investigated First of all mixed powder of graphite hematite in stoichiometric ratio was used to produce iron carbide After that hot ball milling mechanical and thermal activations of graphite hematite mixed powder was carried out under argon atmosphere for about three and six hours in three different temperatures consist of 700 800 and 900 C The analysis of phase transformation and morphologies of mixed powder was made by X ray diffraction scanning electron microscope The amount of each phase was determined by tests of titration image analyzer and LECO combustion analysis thermal analysis DTA DSC and EDS X ray results showed that wustite phase was produced by hot ball milling at 700 C for 3 and 6 hours which explained the reduction of hematite to wustite in the presence of graphite Iron phase with wustite was made by hot milling at 800 C for 3 hours and increasing the time of hot ball milling to six hours created iron carbide and iron phases Hot ball milling at 900 C decreased duration of iron and iron carbide from 6 to 3 hours SEM images and EDS analysis of 800 and 900 C samples indicated the presence of perlite proeutectoid iron carbide phase and graphite and ferrite at 900 C in the microstructure Increasing the time of hot ball milling at 900 C raised the decomposition of iron carbide to ferrite and graphite In the next step of assessment with increasing the amount of graphite in double stoichiometric ratio in mixed powder effect of hot ball milling process on carbothermic reduction of hematite and making of iron carbide at 900 C for 1 5 3 and 6 hours was considered Adding the amount of graphite in mixed powder amplified carbon content in these samples Due to the more stability of iron carbide at 800 C cycles with different time and temperature in hot ball milling 800 C and then 450 C increased carbon content in comparison with the same cycle at 900 C and 450 C Mentioned results proved that the role of solid solid reaction in simultaneous mechanical and thermal activations process override mechanical activation and therefore in the shorter time of hot ball milling the rate of reduction reactions increased Keywords Iron carbide Mechanical thermal activation Hot ball milling Carbothermic reduction Hematite Graphite
استاد راهنما :
مسعود پنجه پور، مرتضي شمعانيان اصفهاني
استاد داور :
محمود مرآتيان، مهدي احمديان نجف آبادي
