Investigation of the TiO2/SiC/SiO2 Coating Effect On the Wear Rate of Needle Graphite Electrode by using Electrical Discharge Machining

Subject Areas : Mechanical Engineering

Hossein  Alian Moghadam ¹ (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr /Isfahan, Iran)
majid  jabbari ² (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran)
Saeed  Daneshmand ³ (Department of Mechanical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran)
Saeid  Rasouli Jazi ⁴ (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr /Isfahan, Iran)
Arezoo  Khosravi ⁵ (Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr /Isfahan, Iran)

Received: 2021-02-21 Accepted : 2021-04-11 Published : 2021-06-01

Keywords: Electrode Consumption, Electric Arc Furnace, Needle Graphite Electrode, Sublimation, Electrode Coating, Oxidation, Electrical discharge machining,

Abstract :

Needle graphite electrodes are one of the main parts used in electric arc furnaces. These electrodes have a significant impact on melt quality and product quality, and their consumption is one of the most important parameters of steel production cost in EAF furnaces. Therefore, reducing the consumption of needle graphite electrodes in these furnaces is very important. The main reasons for continuous use of needle graphite electrodes in arc furnaces are oxidation of the sidewalls and sublimation of their tips, and many solutions have been proposed to reduce them. In the present study, the effect of coating consisting of TiO2/SiC/SiO2 elements on the wear rate of the needle graphite electrode in the sublimation state is investigated using EDM (Electrical Discharge Machining- Spark device). For this purpose, the effect of voltage, current, pulse on time and pulse off time on the electrode wear rate are investigated and in this regard, Taguchi design method has been used to reduce the number of experiments. Based on the test results, TiO2/SiC/SiO2 coating reduces the wear rate of the needle graphite electrode due to sublimation.

References:

[1]     Stefanescu, D. M., ASM Handbook, Casting, 9^th.ed. ASM International, Almere, Netherlands, Vol. 15, 2019, ISBN-13: 978-0871700216, ISBN-10: 9780871700216.

[2]     Schwabe, W. E., The Mechanism of Consumption of Graphite Electrodes in Electric Steel Furnaces, Electric Furnace Proceeding, 1971, pp. 140–145.

[3]     Jitendra, S., Ashok, K. S., and Jain, A. K., Fabrication of Novel Coated Graphite Electrodes for the Selective Nano-Level Determination of Cd²⁺ Ions in Biological and Environmental Samples, Electrochimica Acta, Vol. 56, No. 25, 2011, pp. 9095-9104.

[4]     Mashayekhi, J., Principles of Stratification and Nanostructure Analysis, 1^st. ed., IRAN, University Publishing Center Publications, 2015, ISBN 9789640114827.

[5]     Xin, Y., Huang, Q., Su, Z., and Chai, L., A Double Layer Nanostructure SiC Coating for Anti-Oxidation Protection of Carbon/Carbon Composites Prepared by Chemical Vapor Reaction and Chemical Vapor Deposition, Ceramics International, Vol. 39, 2013, pp. 5053–5062.

[6]     Wang, W., Fan, A. L., Investigation on Property of Oxidation Resistance of Al₂O₃ Coating for Common Graphite, Carbon, Vol. 138, 2009, pp. 23-25.

[7]     Zhang, S., Lee, W. E., Improving the Water-Wettability and Oxidation Resistance of Graphite Using Al2O3/SiO2 Sol-Gel Coatings, Journal of the European Ceramic Society, Vol. 23, 8, 2003, pp. 1215-1221.

[8]     Jiao, G. S., Li, H. J., Li, K. Z., and Zhang, Y. L., Multi-Composition Oxidation Resistant Coating for Sic-Coated Carbon/Carbon Composites at High Temperature, Materials Science and Engineering: A, Vol. 486, No. 1-2, 2008, pp. 556-561.

[9]     Nechepurenko, A., Samuni, S., Oxidation Protection of Graphite by BN Coatings, Journal of Solid State Chemistry, Vol. 154, No. 1, 2000, pp. 162-164.

[10]  Zurecki, Z., Edward, A., Hayduk, J. R., John, G., North Robert, B., Swan, D. L., and Mitchell, J. R., Method of Forming Titanium Nitride Coating on Carbon Graphite Substrates By Electric ARC Thermal Spray Process Using Titanium Feed Wire And Nitrogen as the Atomizing Gas,1993, U.S Patent No. 5254359.

[11]  Fu, Z. Q., Wang, C. B., Tang, C. H., Zhao, H. S., and Robin, J. C., Oxidation Behaviors of SiO2/SiC Coated Matrix Graphite of High Temperature Gas-Cooled Reactor Fuel Element, Nuclear Engineering and Design, Vol. 265, 2013, pp. 867-871.

[12]  N. Bahlawane, A High-Temperature Oxidation-Resistant Coating, For Graphite, Prepared by Atmospheric Pressure Chemical Vapor Deposition, Thin Solid Films, Vol. 394, No. 1-2, 2001, pp. 298-303.

[13]  Schroeder, B., Schenk, W., Alkan, Z., and Conrad, R., Ceramic Coatings for HTR Graphitic Structures - Tests and Experiments with SiC-Coated Graphitic Specimens, Organization for Economic Co- Operation and Development, Paris, Vol. 404, 2000, pp. 199-212.

[14]  Neufuss, K., Macku, A., Forejt, A., and Kasik, P., Protective Layer for Carbonaceous Materials and Method of Applying the Same, U.S Patent No. 4772514, 1988.

[15]  Yang, G., Wang, W., Peng, S., and Huang, Z., The Research On Oxidation Resistance Ability and Mechanical Properties of Carbon Fiber Reinforced Phenolic Resin Composites, Materials Research Express, Vol. 7, No. 6, 10, 2020, DOI 10.1088/2053-1591/ab9856.

[16]  Chen, L., Yang, L., Liu, Z., Huang, D., and Qiu, A., Erosion and Surface Morphology of the Graphite Electrodes in High-Current, High-Coulo Transfer Gas Switch, IEEE Transactions On Plasma Science, Vol. 46, No. 10, 2018, pp. 3320-3324.

[17]  Xia, K., Lu, C., Yang, Y., Preparation of Anti-Oxidative SiC/SiO2 Coating On Carbon Fibers from Vinyltriethoxysilane by Sol-Gel Method, Applied Surface Science, Vol. 265, 2013, pp. 603-609.

[18]  Fu, Z. Q., Sun, J., Wang, C. B., Lv, J. G., Tang, C. H., Liang, T. X., and Robin, J. C., Stability Analysis of SiO2/SiC Coatings On Matrix Graphite for HTR-10 Fuel Elements, Nuclear Engineering and Design, Vol. 341, No. 6, 2011, pp. 2068-2074.

[19]  Fu, Z. Q., Liang, T. X., Robin, J. C., and Tang, C. H., The Stability of SiC Coating and SiO2/SiC Multilayer On The Surface of Graphite for HTGRs at Normal Service Con- Dition, Applied Surface Science, 2040, Vol. 1-4, 2005, pp. 349-354.

[20]  Rozenek, M., Kozak, J., Dabrowki, L., and Lubkowski, K., Electrical Discharge Machining Characteristics of Metal Matrix Composites, Journal of Materials Processing Technology, Vol. 109, 2001, pp. 367–370.

[21]  Jeswani, M. L., Effect of the Addition of Graphite Powder to Kerosene Used as The Dielectric Fluid in Electrical Discharge Machining, Wear, Vol. 70, 1981, pp. 133-139.

[22]  Yan, B. H., Chen, S. L., Characteristics of SKD11 by Complex Process of Electricdischarge Machining Using Liquid Suspended with Aluminum Powder, Jpn. Inst. Light Met., 1994, Vol. 58, No. 9, pp. 1067–1072.

[23]  Tzeng, Y. F., Lee, C. Y., Effects of Powder Characteristics On Electro Discharge Machining Efficiency, Int J Adv Manuf Technol, 2001, Vol. 17, pp. 586–592.

[24]  Daneshmand, S., Farahmand Kahrizi, E., Lotfi Neyestanak, A. A., and Monfared, V., Effects of Al₂O³ Powder on Electro Discharge Machining Process of Nickel-Titanium Shape Memory Alloy, Optimization and Advanced Materials-Rapid Communications, Vol. 8, No. 11-12, 2014, pp. 1119-1124.

[25]  Masoudi, B., Daneshmand, S., The Effect of Electric Discharge Machining on Aluminum Base Composite 2024 Using Total Normalized Parameters (TNQL) and Signal to Noise Ratio (S / N), Quarterly Journal of Scientific Research New Processes in Materials Engineering, Vol. 11, First Issue, 2017, pp. 91-110.

[26]  El-Hofy, H., Advanced Machining Processes: Nontraditional and Hybrid Machining, McGraw-Hill, 2005, ISBN 0071466940.