Temperature Distribution of Ceramic Top-Coat in Thermal Barrier Coatings Via Delamination Crack Shape and Size
DONG Hui1 , ZHOU Panhu1 , ZHOU Yong1 , HAN Yan2 , WANG Heyu 1 , HUA Wanchao1
(1. Xi’an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China； 2. State Key Laboratory of Performance and Structure Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China)
Abstract：The finite element simulation was used to characterize the relationship between different crack shapes in the thermal barrier coating ceramic top-coat and the shape and size of bright spots on the coating surface. The results show that when the crack length is less than 1mm, the shape effect of the crack has no obvious effect on the surface temperature distribution and size of coating ceramic top-coat. When the crack length exceeds 1mm, the shape of the bright spot on the surface of the ceramic top-coat gradually follows the shape of the internal delamination crack, and the larger the crack edge effect (the smaller the angle), the more the shape change of the bright spot on the ceramic top-coat surface above it tends to the shape of the internal delamination crack. Different shape crack size and area have different effects on the maximum temperature of the ceramic top-coat above the crack. With the increase of crack size and area, the maximum temperature of the ceramic top-coat above the three shape cracks increases. When the crack size exceeds 0.5mm, the difference of surface temperature of the three cracks gradually increases, and the increase of surface temperature of cylindrical crack is the most significant. Therefore, the size of the bright spot on the surface of the ceramic top-coat can reflect the actual size of the internal crack, and the relationship between the bright spot size and the internal crack size is not affected by the crack shape, location and other factors.
2021, 
