航空エンジン用耐熱材料の現状と進展

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Greater jet engine power and fuel economy have been achieved by increased turbine firing temperature and adaption of efficient cooling systems. The means for attaining reduced cooling flow while increasing life and reliability include refinement of new high temperature materials and fabrication process. This paper provides examples from current and future engines. Ti and Ti alloys, and Ni-Cr-Fe alloys have been the primary materials in compressor components. Higher temperature capability will be a key requirement in next engines where new Ti alloys, aluminide intermetallics, and surface coating technologies will likely be incorporated. Althogh the superalloys, Ni-and to some extent Co-base, continue to be major materials in hot zone, it is apparent that their maximum use temperature is rapidly being approached. The use of new materials for potential payoffs is extensively studied to increase the temperature capability and/or to reduce densities. These include ceramics, intermetallics and composites. Any prediction of course, depends on the R&D efforts that are sustained over a period of 5 to 15 years in order for the materials and design engineers to be able to bring these materials to a point of realiness.
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