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| Home > Publications database > Microstructure and cyclic oxidation behavior of APS TBC systems drilled with various laser methods |
| Journal Article | FZJ-2020-01938 |
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2019
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/24844 doi:10.1016/j.surfcoat.2019.125018
Abstract: Aiming towards an optimization of drilling of cooling holes for gas turbine applications, thermal barrier coated specimens were drilled with different laser set-ups. The investigated TBC system consists of an APS deposited TBC systems, a MCrAlY bond coating (BC), and a Nickel-based super alloy. The microstructural analysis was performed after laser drilling and also cyclic oxidation tests, in order to understand the influence of different laser drilling parameters, i.e. trepanation/percussion drilling, long-pulsed and ultra-short pulsed lasers, and hole angle. Aiming towards this, the first test series consisted of an assessment of specimens that were laser drilled with different parameters which were only analyzed regarding microstructural aspects, whereas the second series was based on specimens that were laser drilled with various laser parameters which were subsequently tested by cyclic oxidization experiments. Initiation and progress of delamination as function of the number of cycles was assessed from thermography images and correlated with complementary finite element analysis.
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