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Wednesday, November 4, 2020 – 12:00PM to 1:00PM
Dr. William G. Fahrenholtz
Title: Ultra-High Temperature Ceramics for Extreme Environments
Location: Virtual Webex Address: https://duke.zoom.us/j/9088262425
Abstract: Ultra-high temperature ceramics are a class of materials that are proposed for use in conditions that are beyond the capabilities of existing materials. Desired future capabilities such as hypersonic flight, concentrated solar power, and nuclear fusion expose materials to extreme temperatures, heat fluxes, and neutron irradiation levels. Historic research identified transition metal boride, carbide, and nitride ceramics as candidates for use at temperatures of 2000°C or higher. Recent results from our laboratory have addressed fundamental structure-property relationships at elevated temperatures, explored fusion welding, and examined solute distributions in boride ceramics. The presentation will also discuss thermodynamic aspects of the formation of carbide-based ultra-high temperature ceramics and vacancy ordering in zirconium carbide. Finally, emerging research trends will be presented.