Abstract
The Department of Energy (DOE)-Fossil Energy Advanced Research and Technology Development (AR&TD) Materials Program is sponsoring research to understand the mechanisms of, and develop resolutions to, corrosion and erosion in coal conversion and combustion energy systems. In liquefaction, improved materials have been identified for highly eroded pressure let down valves and for corrosion in fractionation columns. For gasification, new alloys are being developed to withstand 800°C (1470°F) oxidation and sulfidation atmospheres. Research is developing a better understanding of the formation of protective and corrosion-product scales, their mechanical properties, the effect of elements in the base metal on the scale adherence and the effect of sulfur and chlorine in damaging its protectiveness. The role of ash deposits is being investigated. Lower temperature aqueous corrosion susceptibility is being examined for maintenance and shutdown periods. Improved refractories have been identified for longer life in dry or slagging gasifiers. Materials are being tested and new ones are being developed for improved corrosion resistance in combustion systems. Claddings and coatings are being developed to provide more economical means of providing a corrosion resistant surface on less expensive structural materials with marginal corrosion resistance. Ceramic composites are prime candidates for high temperature, erosive, corrosive environments. Silicon carbide and oxide ceramics are being examined for 1100-1260°C (2000-2300°F) heat exchanger service.
