سعيد ضيايي راد، ‎محمود فرزين، محسن بدرالسماي، محمدحسين عنايتي، علي صدوق ونيني

مهندسي مكانيك

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به فارسي و انگليسي

Design Simulation and Manufacturing of Hybrid Microwave SinteringSystem to Produce Nanocomposites with Improved Mechanical Behavior Reza Abedinzadeh abedinzade@me iut ac ir Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree Doctor of Philosophy Ph D Language FarsiSupervisor Seyed Mohsen Safavi mosafavi@cc iut ac irAdvisor Fathallah Karimzadeh karimzadeh f@cc iut ac irAbstract In this work a hybrid microwave sintering method was used to produce nanostructuredand nanocomposite materials Firstly the hybrid microwave sintering system was designedand fabricated Furthermore numerical simulation of microwave assisted hot press processwas performed using Finite Element Method to examine furnace behavior in theelectromagnetic field The hybrid microwave sintering system with the maximum outputpower of 6 kW at the frequency of 2 45 GHz is a high power system This machine canproduce the disks with diameter of 50 mm The bulk nanostructured Al andAl 4Wt Al2O3 nanocomposite samples were produced using the hybrid microwavesintering system to confirm the performance of the machine Then the samples werecharacterized by microstructural observations XRD analysis density measurement microhardness nanoindentation and pin on disk wear tests The results showed that thenearly full dense samples with low grain growth at sintering temperature of 550 Cexhibited good thermal stability In addition the hardness and elastic modulus ofnanocomposite sample were increased and its coefficient of friction and wear rate weredecreased This can be due to the presence of alumina ceramic reinforcement in thenanocomposite According to the SEM observations the dominating wear mechanism ofnanostructured Al appeared to be delamination mechanism whereas the governing wearmechanism of Al 4Wt Al2O3 nanocomposite was abrasion and delamination Finally acomparative study was carried out on the wear properties of Al 4Wt Al2O3nanocomposite prepared by hybrid microwave sintering and conventional hot presssintering The hybrid microwave sintering method showed more densification andimprovement in hardness and wear resistance in comparison with conventional method Keywords Hybrid microwave sintering system Hot press Finite element simulation Nanocomposite Density Microstructure

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سعيد ضيايي راد، ‎محمود فرزين، محسن بدرالسماي، محمدحسين عنايتي، علي صدوق ونيني