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Detailed Program
Paper Number : AD-P02
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : Advanced Coating for Gas Turbines
Session Chair 1# : -
Session Chair 2# : -
Effect of Time on The Properties of oxide layers of Al7075 aluminum alloyPrepared by Electrolytic Plasma processing
Mr. Keunyoung Park
Changwon National University
Electrolytic plasma processing (EPP) is a novel electrochemical and physical surface treatment process for generating protective coatings on light metals. Because these coatings can present high hardness and continuous barriers, it can offers good protection against abrasion, in this work corrosion and heat as well as electrical insulation. The EPP treatments were carried out under a hybrid voltage of AC 200V (50Hz) combined with DC 260V power supply. Micro-hardness of coatings is measured by Vickers hardness test. A combined composition and structure analysis of surface and cross-sectional layer was carried out by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The results of XRD show that the ceramic coatings mainly consist of mullite, ¥á-Al2O3 and ¥ã-Al2O3 phase. The ceramic coatings prepared in 30 min have highest value (1794 Hv) of micro-hardnes.
Acknowledgements : This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) (No.2011-0030058). This research was financially supported by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea(NRF) through the Human Resource Training Project for Regional Innovation (2012H1B8A2026212)