7209

6715

كارشناسي ارشد

مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1391

چهارده، 93ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

حسين ادريس، رحمت ا... عمادي

14/8/91

مرتضي شمعانيان، حميدرضا سليمي جزي

1396/09/20

كتابنامه

مواد

مهندسي مواد

ID6715

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation effect of Mechanical Activation on the Al2O3 TiC Composite produced using in TiO2 Al C System Asghar Nimjerdi Raviz a nimjerdyraviz@ma iut ac ir 2012 Department of Material Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiH Edris Professor Supervisor H Edris@cc iut ac irR Emadi Associate Professor Supervisor REmadi@cc iut ac irAbstractThere are various methods to produce composites Among them the most efficient method of producingAl2O3 TiC composites is the self Propagating High Temperature Synthesis SHS This because the bothcompounds have very high melting temperature the primary materials react in exothermic reactions Variousparameters may be considered including the effect of mechanical activation of initial powders the presenceof diluent agent and type of carbon source on the propagating velocity of combustion front the porosity mechanism of formation and morphology of products also considered In order to fabricate the composite inthis manner firstly primary materials i e TiO2 Al and C was mixed based on the stoichiometric fractions After achieving powder samples the SHS process was done on the powder It was found that the optimumactivation time in milling velocity of 500 round min was 2 hours and 1 5 hours for graphite and activatedcarbon respectively Using ImageJ and Easy Fit softwares particles size and their distribution in differentsamples were calculated Using SEM picture in the magnification of 32000X for activated carbon as thesource of carbon the average particle size in activation times of 0 5 1 0 and 1 5 were 100 99 and 107 with 10 errors per cent respectively In the case of graphite as the source of carbon the average particles size inactivation times of 0 5 1 0 and 1 5 was 216 124 132 and 140 respectively The amount of porosity in theactivated carbon bulk sample at applying forces of 16 and 50 kN was 31 47 and 31 33 respectively For thegraphite sample at the same condition the amount of porosity was 26 13 and 18 45 respectively Changing inthe applied force had not any impact on the propagation velocity of combustion front but it was dependenton the type of used carbon source The addition of diluent agent caused to reduce propagating time ofcombustion front and also adiabatic temperature By increasing the concentration of diluent agent the rate ofreduction in propagating time of combustion front which was caused by increasing the extent of mechanicalactivation decreased The results of x ray diffraction XRD showed that the expected final phases of thereaction formed A reduction of the order of 250 centigrade in the temperature of the reaction after activationof activated carbon sample for 1 5 hours was determined by differential thermal analysis DTA SEMmicrographs represented the distribution of spherical TiC Particles in Al2O3 phase Key words SHS mechanical activation Al2O3 TiC composite

حسين ادريس، رحمت ا... عمادي

مرتضي شمعانيان، حميدرضا سليمي جزي