S0402-1-3 遮熱コーティングの加熱によるはく離損傷過程の結晶解析にもとづく評価(表面改質および薄膜コーティング)

概要

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Iso-thermal heating tests were conducted at 900℃ and 1000℃ on thermal barrier coatings (TBC) samples consisted with 8wt%Y_2O_3-ZrO_2 top coating and CoNiCrAlY bond coating. Reduction of area fraction of pores was observed by optical microscope at the very early stage of heating at both temperatures. On the other hand, Increase in crack length density were observed at the final stage of delimitation. EBSD observation clearly showed that the crack growth morphologies were closely related to the micro structure of top coating such as the boundary cracks at the small columnar splat zones near coarse particle zones and the interparticle lateral cracks at the coarse particle zones. EBSD method was proved to be a very effective measure for the observation of splats and defects at the top coating of TBC.
2009-09-12