耐熱コーティングシステムにおける酸化物層の残留応力に及ぼす亀裂の影響

抄録

In this study, two-layer specimens of Ni-base superalloy coated with CoNiCrAlY alloy were subjected to thermal exposure test at 1000 ° C and 1100 ° C for up to 1000 hours. Microscopic observation, elemental analysis and residual stress measurement were performed using FESEM and microscopic Raman spectroscopy to elucidate the oxidation and interface damage in the bond coat. Microscopic observation confirmed the difference between the surface and cross section of each thermal spraying method and the influence of the thermal exposure test. Elemental analysis revealed the distribution of elements in the grown oxide layer (TGO). Furthermore, by focus on the distribution of Yttrium, it was confirmed that there was a difference in the location and direction of each thermal spraying. The thermal exposure time and the amplification of the oxide layer, the tendency of residual stress reduction were read, and investigated their correlation.