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The primary goal in the development of advanced structural ceramics has been to provide high-strength, corrosion-resistant materials for use in high-temperature, aggressive environments. Much of the developmental effort has focused on heat exchangers for use in industrial gas- or coal-fueled systems with temperatures on the order of 1200 to 1400°C. while ceramics are often popularly described as inert to chemical degradation, the corrosion resistance of these materials actually ranges from excellent to very poor, depending especially on the compositions of the environment and the material. Understanding these dependencies is critical to the development of a materials selector expert system for advanced ceramics. The present paper examines the development of a set of rules for a material selector expert system based on relations among composition, microstructure, transport processes, operating conditions, and corrosion. The concurrent information requirements that must be provided in a computerized materials property database are discussed also.
ceramics, corrosion, expert systems, heat exchangers, high temperature, knowledge base, material selection, property database, computerized material property databases, computers data systems, materials databases
Physicist, National Institute of Standards and Technology, Gaithersburg, MD