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Fracture Behavior of Ceramic Coatings Subjected to Thermal Shock  

Han, Ji-Won (Department of Mechanical Engineering, Hoseo University)
Publication Information
Journal of the Korean Society of Safety / v.18, no.4, 2003 , pp. 39-43 More about this Journal
Abstract
An experimental study was conducted to develop and understanding of fracture behavior of ceramic thermal barrier coating when subjected to a thermal shock loading. The thermal loading was applied using a 1.5kW $CO_2$ laser. In the experiments, beam-shaped specimens were subjected to a high heat flux for 4sec and cooling of 7sec in air. The interface crack length was increased as the crack density, the surface pre-crack legth and the coating thickness were increased. The center surface crack length was increased as the maximum surface temperature got higher and the surface pre-crack length for shorter.
Keywords
thermal barrier coating; thermal shock; surface per-crak; interface crack;
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