پديد آورنده :
اصغر زاده جاويد، فاطمه
عنوان :
توليد MoSi2 به روشهاي آلياژ سازي مكانيكي و سنتز احتراقي در حضور مس
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
هفت، 120، [I] ص.: مصور، جدول، شكل، نمودار
استاد راهنما :
محمد حسن عباسي، علي سعيدي
استاد مشاور :
مرتضي شمعانيان
توصيفگر ها :
موتورهاي ديزلي , لانسهاي فلزات مذاب , مشعل هاي گازي صنعتي
استاد داور :
جمشيد عميقيان
تاريخ ورود اطلاعات :
1396/02/31
چكيده فارسي :
به فارسي و انگليسي:قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
AbstractProduction of MoSi2 by mechanical alloying and self propagating high temperature synthesisin the presence of copper was investigated The parameters affecting MA process includingthe revolution rate of the cup milling time ball to powder ratio BPR and diameter andnumber of balls in the constant BPR were studied The effect of copper presence on theproducts of MoSi2 combustion synthesis ignition and combustion temperature was alsoevaluated Finally the effect of raw materials and mechanical activation in the presence ofcopper on combustion and ignition temperatures was analyzed Results showed that with 250rpm and long alloying times 32 hrs and more meta stable Mosi2 Mosi2 was produced ButMoSi2 production was not completed even after 60 hrs of milling However with 550 rpm theconversion of raw materials to product was completed after 17 hrs of alloying Type andquantity of products were different in 250 and 550 rpm for the same alloying time No productwas achieved with 120 min mechanical alloying and BPR 10 1 When BPR was 20 1 smallamounts of MoSi2 was produced and with BPR 40 1 small amounts of MoSi2 and MoSi2 was observed At constant BPR by increasing the balls diameter MoSi2 was produced and the amount of product increased using balls with different diameters In combustionsynthesis of MoSi2 in the presence of copper it was observed that before the beginning of thecombustion synthesis reaction eutectic melt of Cu Si forms in contact with the Mo particles The reaction between Si in this melt and Mo particles increase the temperature By melting Siparticles and dissolving Mo and Cu in it combustion synthesis reaction starts Furthermore itwas shown that Mo and Si rich silicide phases precipitate at the MoSi2 grain boundaries andthe amount of these phases increases with increasing the copper content The ignition andcombustion temperatures of mixture decreased and increased with increasing copper content respectively In samples containing the same copper content combustion and ignitiontemperature decreased with increasing activation time
استاد راهنما :
محمد حسن عباسي، علي سعيدي
استاد مشاور :
مرتضي شمعانيان
استاد داور :
جمشيد عميقيان
