K-0645 ガスタービン動翼コーティング材の実機使用による劣化(S06-4 界面強度と高温強度)(S06 コーティング材の力学特性と損傷機構)

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This paper describes the effect of in-service exposure on the microstructure and mechanical properties in aluminized CoCrAlY coatings and Ni-base superalloy substrates of advanced gas turbine blades. The aluminized coatings of the in-service exposed gas turbine blades consisted of four layers with different microstructure and chemical composition. In-service environmental attack led to the deposition of Fe oxides on the top aluminized coating and the formation of a thin-layered Al_2O_3. While in-service, Ni diffused extensively from the substrate into the near-surface coating region. The interdiffusion of Ni/Co resulted in the formation of Al/Ni rich intermetallic phases in all the coating regions, except a near-surface coating region indicating Cr rich phases. In the internal coating region, Cr rich phases disappeared. The near-interface coating region and substrate softened at RT and elevated temperatures. The fracture strain of the internal and near-interface coating regions and substrate at elevated temperatures was decreased.
社団法人日本機械学会の論文
2001-08-22