پديد آورنده :
نوربخش، محمد
عنوان :
ساخت تركيب بين فلزي دي سيليسيد موليبدن از طريق فرايند سنتز احتراقي در حضور زيركونيم
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد
صفحه شمار :
سيزده، 96ص.: مصور، جدول، نمودار
استاد راهنما :
مسعود پنجه پور، مهدي احمديان
توصيفگر ها :
سنتز احتراقي خود پيشرونده , سنتز انفجاري , دماي احتراق , مقاومت به اكسيداسيون
تاريخ نمايه سازي :
1394/07/04
استاد داور :
مرتضي شمعانيان، علي مالكي
تاريخ ورود اطلاعات :
1396/10/04
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
4 Fabrication of MoSi2 Intermetallic Compound by Combustion Synthesis Process in the Presence of Zirconium Mohammad Nourbakhsh mohammad nourbakhsh1@ma iut ac ir 2015 07 26 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Dr M Panjepour Assoc Prof E Mail panjepour@cc iut ac irDr M Ahmadian Assoc Prof E Mail ahmadian@cc iut ac irAbstractMolybdenum disilicide intermetallic MoSi2 compound is one of the most important hightemperature silicide compounds which features relatively high density good electrical andthermal conduction and excellent high temperature oxidation resistance Despite the excellentresistance to high temperature oxidation low resistance to oxidation at intermediatetemperatures have been reported for this compound In the present study self propagatinghigh temperature SHS and thermal explosive TE synthesis methods were used to fabricateMoSi2 compound in the presence of zirconium with the aim to eliminate this problem Incontinuation to evaluate the effect of these methods specimens with the appropriatestoichiometric ratios of silicon and molybdenum powders with 0 2 5 7 and 10 wt ofzirconium powder were synthesized under air and argon atmospheres Microstructuralobservations were made by using optical and scanning electron microscopes in addition X ray diffraction XRD analysis and energy dispersive spectroscopy EDS were used for phaseand chemical composition identification In order to determine the effect of the zirconium onthe mechanism of formation of MoSi2 during combustion synthesis fast cooling of burningsample frozen combustion wave was applied Furthermore temperature profile andpropagation of combustion wave were investigated for specimen of synthesized by SHSmethod Obtained results indicate that by increasing the zirconium content increases heatamount released during formation of ZrO2 and ZrSi2 and solution of zirconium in the structureof MoSi2 and so that leading to an increase in the velocity of the combustion wave However this effect is less significant for specimens of synthesized under argon atmosphere Forexplosively synthesized specimens the ignition temperature decreases with increasing thezirconium content so that this temperature is 1395oC in sample non zirconium and achieve1050oC in sample with 10 wt zirconium under argon atmosphere But with regard toformation of SiO g by the endothermic reaction of silicon with SiO2 the ignition temperaturewas increased under air atmosphere in comparison to argon atmosphere Finally oxidationtests were performed on specimens of synthesized by SHS process under air atmosphere Ahigher intermediate temperature oxidation resistance was obtained for specimens containingzirconium compared to that of zirconium free ones Therefore obtained results reveal thataddition of zirconium not only results in reduction of ignition temperatures and increase in thevelocity of the combustion wave but also improves the intermediate temperature oxidationresistance Keywords Molybdenum disilicide Zirconium Self propagating high temperature synthesis Thermal explosive Ignition temperature oxidation resistance
استاد راهنما :
مسعود پنجه پور، مهدي احمديان
استاد داور :
مرتضي شمعانيان، علي مالكي
