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The coating team has newly established since Apr. 2002, in the Dept of Materials Engineering, the University of Tokyo. Strongly collaborating with NIMS, the coating team is aiming at developing coating materials for high temperature structural materials.
Traditionally, coatings and substrate metals have developed independently. With new technologies creating a broad range of high-temperature materials, gas turbines now operate at significantly higher temperatures than a decade ago. To increase the operating temperature furthermore, HTM21 project has been developing novel materials capable of unusually higher temperature exposure. Under these circumstances, interdiffusion of substrate and coated materials will become significant and cause serious problems due to the microstructural deterioration. Turbine coatings and base alloys should thus be designed and developed interdependently.
Above these as backgrounds, our research part provides some Ni-base single crystal superalloys, all designed and proposed by NIMS. These superalloys are to be coated with Re-Cr-Ni/Pt-Ni-Al by other research teams and then our group will investigate (1) the diffusibility of solute atoms of the layer into the substrate, (2) the change in concentration of solute atoms of the substrate and (3) microstructural change as a function of heating time. By integrating these investigations, our final goal is to elucidate the criterion at which TCP phase precipitates and evaluate the role of coated materials as a diffusion barrier.
Above this as backgrounds, we are focusing on the following research topics.