On 28th at 12.40, Weekly Department Series will be proudly hosting Asst. Prof. Dr. Bilge Imer whom will be joining us from METU, Department of Metallurgical and Materials Engineering. Asst. Prof. Dr. Bilge Imer will be giving a talk on “Oxidation/Corrosion Resistant Coatings with Chemical Vapor Deposition”
Abstract: Nickel based super alloys are used in the hot sections of industrial gas turbines due to their excellent mechanical strength and creep resistance at high service temperatures. To protect turbine blades from thermo-mechanical failure, oxidation/corrosion resistant coatings are necessary to extend the life time. For this purpose, diffusion coatings including chromized, siliconized, aluminide coatings have been studied. Among them, aluminide coatings are widely preferred in turbine applications due to its ability to form stable oxides that prevent oxygen diffusion to substrate materials. Aluminide coatings are generally applied by pack cementation, above-pack-process, slurry and chemical vapor deposition (CVD) methods. Although pack cementation is simpler and cheaper coating method, CVD has advantages over other coating processes because of its high ability to control process variables such as process gas flows and their ratios, chamber temperature, chlorinator temperature and system pressure; hence coating microstructure and homogeneity in composition. In this research, effect of CVD process variables on gas phase aluminizing are investigated to obtain highly pure and chemically uniform β phase NiAl compound with high Al content aluminide coating on Inconel substrates, and to develop a simulation model using DICTRA that is compatible with experimental CVD operations.
About Bilge Imer: Bilge İmer received her B.S. degree in Materials Engineering from University of Pittsburgh in 2000, and Ph.D. in Materials from University of California Santa Barbara (UCSB) in 2006 along with M.A. degree in Business Economics and Technology Entrepreneurship Program Degree. At UCSB, she worked on improving the quantum efficiency of III-Nitride optoelectronic devices with MOCVD and filed two US patents. She joined Bilkent University as Res. Asst. Prof. to help establishing National Nanotechnology and Research Center (UNAM) in 2007, where she conducted research on improving extraction quantum efficiency of Nitride LEDs with photonic crystals, and developed many programs including Technology Entrepreneurship Program for Graduate Students, International Cleanroom Workshop with UNIDO, Nanotechnology for Kids, etc. After leaving UNAM, she worked at ASELSAN as a project manager in detectors group until 2013. Then, she joined the Department of Metallurgical and Materials Engineering at Middle East Technical University (METU) in 2013. Dr. İmer is the director of “Thin Films and Coatings Research Laboratory”. Her research interests are: Thin films and coatings by CVD and PVD techniques; Epitaxy and crystal growth; Nanophotonics and novel nanoparticle synthesis.