پديد آورنده :
عسكري، جواد
عنوان :
بررسي فرايند توليد كاربيد كروم با استفاده از روش آلياژ سازي مكانيكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
﴿استخراج فلزات﴾
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان،دانشكده مواد
صفحه شمار :
نه، 98، [I] ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
حسين ادريس
استاد مشاور :
محمد حسين فتحي
توصيفگر ها :
دانسيته , دياگرام فازي , نوع آسيا , پراش پرتو ايكس , دانه كريستالي
استاد داور :
مرتضي شمعانيان، جمشيد عميقيان
تاريخ ورود اطلاعات :
1396/02/31
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
AbstractIn this research production of Cr3C2 and Cr7C3 carbides from chromium powder andgraphite mixture with Cr60C40 composition using mechanical alloying method wasstudied Effects of parameters such as ball mill speed weight ratio of ball to powder andball size on mechanical alloying process were investigated Changes occurred in internal structure of the powder particle during mechanical alloyingwere investigated using X ray diffraction XRD Also changes in morphology andmicrostructure of the powder particles were studied employing scanning electronmicroscopy SEM Results in Cr60C40 mixture show that mechanical alloying at first establishes a lamellarlayer consists of graphite and chromium layers Layers thickness decreases by increasingthe time of MA Mechanical alloying to 40 hours produces amorphous phase Increasingthe MA time to 50 hours a mixture of Cr 3C2 and Cr7C3 phases in an amorphous phasematrix would be obtained By increasing the ball mill rotation speed from 250 to 560 rpm at 50 hours MA carbidephase of Cr7C3 in an amorphous phase matrix would be obtained Weight ratio ob ball topowder increased from 20 to 30 and Cr7C3 carbide formation time decreased to 10 hours Also balls number at constant weight ration of ball to powder increases the amorphousmatrix Because completely equilibrated carbide obtained after the heat treatment ofmechanically alloyed powders therefore the effect of ball milling intensity on theproductions type after heat treatment was investigated By heat treatment at 800oC an 2 hours on the 5 hours mechanically alloyed specimenwith ball milling rotation of 250 rpm single phase Cr 3C2 was obtained Increasing thetime and intensity of ball milling results in the increase in the intensity of Cr7C3 phasewith respect to the Cr3C2 after next heat treatment Also increasing the time andtemperature of heat treatment has a similar effect
استاد راهنما :
حسين ادريس
استاد مشاور :
محمد حسين فتحي
استاد داور :
مرتضي شمعانيان، جمشيد عميقيان
