Thermal modelling parametric optimization of edm of sic cnt non conductive ceramic matrix composite cmc

Abstract

viii newlineAbstract newlineElectrical Discharge Machining (EDM) is an electro-thermal process of machining newlineelectrical conductive material by Non-contact technology. Silicon Carbide is a strong newlineceramic material which exhibit electrical non-conductive property. But its includes newlinehigh end application such as Micro- electro-mechanical system (MEMS), sensor, Li- newlineion battery electrode, heat exchanger, water filtration etc. which required electrical newlineconductive properties as well as précised machining. To make it electrical conductive newlineMultiwall Carbon Nano tube (MWCNT) as reinforcement (with 2, 4, 6 weight newlinepercentage) has been introduced to the SiC matrix and this makes it possible to newlinemachine it in EDM. The fabrication has been done by taking the Spark Plasma newlineSintering Route (SPS). To establish the thermal model Aluminum metal matrix newlinecomposite (Al A359 SiC MMC) has been used as work piece. The Al A359 SiC MMC newlinehas been fabricated by Powder metallurgy process. A three conditions dimensional newlineaxi-symmetric computational domain has been developed by using COMSOL multi- newlinephysics software considering three different boundary conditions. The model has been newlineverified by taking three different heat sources (Disk, Point and Gaussian). The newlineGaussian heat source model shows 4.09 % and 8.69 %error in terms of crater radius newlineand crater depth respectively while validating for Al A359 MMC. The similar model newlinehas been used for SiC/CNT Ceramic matrix composite (CMC) machining modelling. newlineIt has been seen that the model shows a maximum error between the predicted and newlineexperimental erosion rate (MRR) is 10.6% for SiC/CNT machining. Specific discharge newlineenergy (SDE) concept has been taken to make the model more realistic. The fraction newline