Publication Date:
2019
Description:
〈p〉Publication date: Available online 17 October 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Surface and Coatings Technology〈/p〉
〈p〉Author(s): V. Ebrahimzade, H. Uchtmann, L. Singheiser, M. Krüger, J. Malzbender〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉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, 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, hole angle. Aiming towards this, the first test series consisted of an assessment of specimens that were laser drilled with different parameters and only analyzed regarding microstructural aspects, whereas the second series was based on specimens that were laser drilled with various laser parameters and 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.〈/p〉〈/div〉
〈/div〉
Print ISSN:
0257-8972
Electronic ISSN:
1879-3347
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
