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Influence of water vapor and slag environments on corrosion and mechanical properties of ceramic materials

Description: Conceptual designs of advanced combustion systems that utilize coal as a feedstock require high-temperature furnaces and heat transfer surfaces that can operate at temperature much higher than those prevalent in current coal-fired power plants. The combination of elevated temperatures and hostile combustion environments requires the development and application of advanced ceramic materials in these designs. The objectives of the present are to evaluate the corrosion behavior of candidate ceramic and metallic materials in air and slag environments and evaluate the residual mechanical properties of the materials after corrosion. The program emphasizes temperatures in the range of 1000-1400{degrees}C for ceramic materials and 600-1000{degrees}C for metallic alloys. Coal/ash chemistries based on thermodynamic/kinetic calculations and slags from actual combustors are used in the program. The materials being evaluated include monolithic silicon carbide from several sources, silicon carbide in a silicon matrix, silicon carbide in alumina composites, silicon carbide fibers in a silicon carbide-mix composite, and some advanced nickel-base alloys. This paper presents results from an ongoing study of the corrosion performance of candidate ceramic materials exposed to dry air, air with water vapor, and slag environments and the effects of these environments on the flexural strength and energy absorbed during fracture of these materials.
Date: March 1, 1997
Creator: Natesan, K. & Thiele, M.
Partner: UNT Libraries Government Documents Department