Experimental Investigation of Silicon Powder Mixed EDM Using Graphene and CNT Nano Particle Coated Electrodes
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ORIGINAL PAPER
Experimental Investigation of Silicon Powder Mixed EDM Using Graphene and CNT Nano Particle Coated Electrodes Jees George 1
&
Ravi Chandan 1 & R. Manu 1 & Jose Mathew 1
Received: 12 February 2020 / Accepted: 14 August 2020 # Springer Nature B.V. 2020
Abstract Nano-coating on electrodes is a new technique to enhance the machinability of difficult-to-machine alloys during Electrical Discharge Machining (EDM). The current investigation seeks to propose a comparative study of nano-particle coated and conventional electrodes during EDM process with an extended objective to machine in WEDM process. The current work seeks to propose a new experimental technique to improve the machinability of difficult-to-machine materials during EDM process by making use of nano-coated electrode considering silicon powder mixed deionised water and hence extend its application in WEDM process. The present study is focused to improve the machining performance of EDM using graphene (rGO) and carbon nano tubes (CNT) nano-coated brass electrodes. A 6–8 μm coating thickness is used for the comparative analysis. The present study considers Inconel 825 as the workpiece material. The experiments were conducted under identical operating conditions as WEDM process by using deionised water as dielectric to extend the study further for nano-coating of brass wires. Silicon powder with a concentration of 4gl was mixed into the dielectric to enhance the quality of the machining process. Grey relational analysis (GRA) and technique for order preference by similarity to ideal solution method (TOPSIS) facilitates determining the optimum input parameters. Voltage = 100 V, Peak current = 9A and Pulse on time = 100 μs was found to be the optimum condition from both GRA and TOPSIS. From the present analysis, an improvement of 16.9% (MRR), 25.59% (EWR) and 14.29% (Sa) was found in case of rGO. Whereas, CNT showed a better improvement of 30.6% (MRR), 29.50% (EWR) and 16.68% (Sa) compared to rGO. Keywords EDM . Silicon . Graphene . CNT . GRA . TOPSIS
1 Introduction Electrical Discharge Machining (EDM) is one of the most prominent non-conventional machining processes used in the present day. It devises a unique method of using thermoelectric energy to machine difficult-to-machine Ni-based superalloys used in aerospace, nuclear, surgical, and other * Jees George [email protected] Ravi Chandan [email protected] R. Manu [email protected] Jose Mathew [email protected] 1
National Institute of Technology Calicut, Kerala, India
applications due to its high strength at high temperature and corrosive environments. Inconel 825 is a Ni-based superalloy which finds difficulty in machining because of its high strain hardening tendency, high dynamic shear strength, and poor thermal diffusivity [1]. Higher electrode wear using copper/ brass electrodes in EDM results in the loss of dimensional integrity of the machined parts and thus results in higher surface roughness. Under the influence of electric forces, the powder particles arrange themselves i
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