Affiliation:
1. Central Research Institute of Electric Power Industry
Abstract
In this paper, coating stresses in thermal barrier coating (TBC) changing with a cyclic heating - cooling are measured with a curvature measurement device developed in this study. Coating system chosen in this study is dual-layered structure, and it consists of a partially stabilized zirconia (PSZ) as ceramic coating layer and CoNiCrAlY as metal-bond coating layer. The specimen used here is a strip-plate shape with thin thickness (600μm) extracted chemically from a thermal spraying coated carbon steel. Cyclic heating-cooling test and cyclic heating-cooling test with a dwelling time at a maximum temperature are conducted for the strip-plate specimen. Deflection and coating stresses are measured continuously under these cyclic tests, and thermal deformation mechanisms generating the deflection and coating stresses will be discussed based on a primitive knowledge by an elementary beam theory.