Characteristics of Al alloy surface after EDC with sintered Ti electrode and TiN powder additive

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題名:	Characteristics of Al alloy surface after EDC with sintered Ti electrode and TiN powder additive
作者:	顏炳華;Chen, Hsin-Jen;Wu, Kun-Ling;Yan, Biing-Hwa
貢獻者:	工學院機械工程學系
關鍵詞:	Aluminum base alloys;CAE) and Design;Coated electrodes;Coefficient of friction;Computer-Aided Engineering (CAD;Corrosion resistance;Electrodes;Engineering;Friction resistance;Industrial and Production Engineering;Kerosene;Material removal rate (machining);Mechanical Engineering;Media Management;Morphology;Original Article;Parameters;Polarity;Protective coatings;Proton exchange membrane fuel cells;Pulse duration;Sintering (powder metallurgy);Spallation;Surface properties;Thickness;Tin;Titanium carbide;Tool wear;Wear rate;Wear resistance;Workpieces
日期:	2014-01-01
上傳時間:	2026-04-23 14:48:05 (UTC+8)
出版者:	Springer London;London: Springer London
摘要:	摘要： Electrical discharge coating (EDC) performs not only machining but also surface modification of workpiece by changing the polarity of the electrode and dielectric medium. As a candidate of metal bipolar plate in proton exchange membrane fuel cell application, machined Al alloy needs surface coating to overcome its poor corrosion resistance. The goal of this study was to investigate the coating characteristics of 6061-T6 aluminum (Al) alloy machined using titanium (Ti)-sintered electrodes in wet and dry EDC. The results show that in wet EDC using cathodic T-8 sintered electrode, both material removal rate (MRR) and tool wear rate (TWR) were kept reasonably low. Discharge current ( I p ) and pulse duration ( T on ) are the main determinants of the morphology of the EDCed Al alloy surface. The appropriate parameters for wet EDC are found to be 1 A < I p < 8 A and 9 μs < T on < 100 μs at DF = 27 %. Adding TiN powder to kerosene not only improved the EDCed surface quality but also decreased the coefficient of friction. The formation of a TiC layer on the machined surface prolonged the onset of friction transition, which would in turn enhance the wear resistance of the machined surface. However, no TiN layer was formed during wet EDC. On the other hand, in dry EDC using anodic T-6 and T-8 sintered electrodes, both MRR and TWR were below zero. A pure TiN layer of 20-μm thickness was deposited on the EDCed surface and featured good spallation resistance. The appropriate dry EDC parameters for forming a pure TiN layer on a workpiece surface are found to be 1 A < I p < 30 A and 6 μs < T on < 72 μs at DF = 16 %. From the experimental results of this study, the application of EDC to surface modification during fabrication of the fluid pattern on an Al metal bipolar plate can be expected. 其他題名： Int J Adv Manuf Technol 出版者： London: Springer London 出版日期： 2014-04-01 出處： International journal of advanced manufacturing technology, 2014-04, Vol.72 (1-4), p.319-332 資源來源： EBSCOhost Academic Search Premier 版權： Springer-Verlag London 2014 版權： The International Journal of Advanced Manufacturing Technology is a copyright of Springer, (2014). All Rights Reserved. 識別號： ISSN: 0268-3768 識別號： EISSN: 1433-3015 識別號： DOI: 10.1007/s00170-014-5669-y
顯示於類別:	[機械工程學系] 期刊論文

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