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During the past year the development of NDT methods to detect and characterize intrinsic variables in coated refractory alloys has continued. The third batch of Cr-Ti-Si coating (TRW) on Cb752 alloy and a second batch of R512C coated (Sylvania) T-111 alloy were characterized by NDT techniques and were monitored in a 2600F furnance environment.
This book assesses the state of the art of coatings materials and processes for gas-turbine blades and vanes, determines potential applications of coatings in high-temperature environments, identifies needs for improved coatings in terms of performance enhancements, design considerations, and fabrication processes, assesses durability of advanced coating systems in expected service environments, and discusses the required inspection, repair, and maintenance methods. The promising areas for research and development of materials and processes for improved coating systems and the approaches to increased coating standardization are identified, with an emphasis on materials and processes with the potential for improved performance, quality, reproducibility, or manufacturing cost reduction.
Includes entries for maps and atlases.
The objective of the program was to utilize the nondestructive testing information, correlations, and techniques, developed during the previous year, for characterizing and evaluating zirconium and hafnium diboride systems and aerospace graphite materials.