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Academic Lectures / Courses
Materials Science Guest Lecturer: Dr. Helen Chan March 22 4:00 pm Hill Hall 300
Department / Organization: Materials Science
Materials Science Guest Lecturer: Dr. Helen Chan March 22 4:00 pm Hill Hall 300
Dr. Helen Chan Dept. of Materials Science & Engineering Lehigh University
Wednesday, March 22 4:00 pm Hill Hall 300
Full Abstract and Biography: http://materials.mines.edu/MSP-seminars
"Towards Bespoke Interfaces in Alumina Ceramics"
1) During the oxidation of high temperature alloys, a slow-growing, protective alumina surface layer forms in-situ. The rate of growth of this layer is critical to the degree of oxidation resistance of such alloys, as well as to the lifetime of thermal barrier coatings. Certain additive elements (e.g. Y, Hf) can have a beneficial effect on the oxidation rate; this is the so-called reactive element (RE) effect. The rate of oxygen transport was probed under both oxidizing /reducing conditions by testing model alumina samples containing a fine dispersion of Ni / Ni2Al2O4 marker particles. Results pertaining to the influence of Hf4+ dopant concentration, pO2 and temperature will be presented, and discussed in terms of the Hf4+ grain boundary segregation behavior and defect chemistry considerations. 2) Unique microstructures, comprising interpenetrating mixtures of metallic and ceramic phases can be achieved from the reduction of complex oxides of the type MIMIIOx+y...