|About this Abstract
||Materials Science & Technology 2012
||Surface Protection for Enhanced Materials Performance: Science, Technology and Applications
||Computational Thermodynamic Modeling Approach to Develop Protective Coatings for Fossil Energy Applications
||Dongwon Shin, Theodore M Besmann, Beth L Armstrong
|On-Site Speaker (Planned)
The present work aims to develop materials surfaces that have a combination of good adherence, high resistance to fireside corrosion and that are tailored for easy application to the waterwall tubes of coal-fired boilers to provide effective protection from sulfidation corrosion and thermal fatigue. Computational thermodynamic modeling has been utilized to expedite materials screening to find suitable coating materials that are thermochemically stable at working conditions. Under current coal-firing and combustion conditions, these tubes are subjected to persistent reducing conditions, which can be conducive to accelerated corrosive attack, whereas other areas experience alternating low- and high-pO2 conditions under which extremely rapid sulfidation attack is possible as a result of sulfur released from pyrite particles sticking to the surfaces. Phase stabilities of candidate oxide coating materials in equilibrium with the tubes at working boiler conditions are presented.* Research sponsored by the U.S. Department of Energy, Office of Fossil Energy.