2651

2593پ

2577

كارشناسي ارشد

استخراج فلزات

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1383

ده، 99ص .: مصور، جدول، شكل، نمودار

علي سعيدي، محمد حسن عباسي

16/01/84

جمشيد عميقيان، حسين ادريس

1396/10/23

كتابنامه

مواد

مهندسي مواد

ID2577

به فارسي و انگليسي قابل رويت در قسمت " نسخه ديجيتال "

Abstract Combustion synthesis technique was used to examine the reaction in Mo Si AI temar systemand to incorporate aluminum into tetragonal C 11b structured lattice of molybdenumdisilicide The starting powder mixtures were chosento be Mo 2 I X Si 2XAI x u o 0 5 In contrast with the Mo 2Si combustion reaction it was demonstrated that incorporatingof AI decreasesthe ignition temperature and helps the exothermocity of the reaction Alsoincreasing of incorporated Al alters the crystal structure of MoSi2 from C 11bto HexagonalC40 which is stable at higher temperatures and further to Orthorhombic C54 It was alsoshown that any increase in the Al additions generally leads to a continuous latticeexpansion in the mentioned structures In this regard lattice parameters were calculated forevery short Al additions interval Also ball milling process on the sample with atomic mixture of Mo 1 6Si O 4AI wasinvestigated Ball milling experiments were conducted under fixed ball powder weightratio and rotation speed It was observed that combination of short duration ball mi lingwith se f propagating high temperature synthesis MASHS cou d reduce the ignitiontemperature to below 500 C and elmance the reaction rate Longer duration ba l millingrevealed the formation of mono ithic C40 structured phase under MSR mechanicallyinduced self sustaining reaction mechanism Influences were ana yzed using differentia thermal analysis OT A X ray diffractometry XRO supported by energy dispersive spectrometry EDS and scanning e ectronmicroscop SEM i j I Ii I A tP o J f 11 t Ii if VI

علي سعيدي، محمد حسن عباسي

جمشيد عميقيان، حسين ادريس