Christoph Vorkötter

Dr. Christoph Vorkötter

orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 March 2019 in Surface and Coatings Technology
Verified
Journal Article
Closed access
CVChristoph Vorkötter
Christoph Vorkötter
Daniel Emil MackDaniel Emil Mack
Daniel Emil Mack
OGO. Guillon
O. Guillon
RVRobert Vaßen
Robert Vaßen

29 July 2019 in Oxidation of Metals
Verified
Journal Article
Closed access
PDF file
CVChristoph Vorkötter
Christoph Vorkötter
SHS. P. Hagen
S. P. Hagen
GPG. Pintsuk
G. Pintsuk
Daniel Emil MackDaniel Emil Mack
Daniel Emil Mack
SVSannakaisa Virtanen
Sannakaisa Virtanen
RVRobert Vaßen
Robert Vaßen

17 March 2022 in Coatings
Verified
Journal Article
Open access
PDF file
CVChristoph Vorkötter
Christoph Vorkötter
Daniel Emil MackDaniel Emil Mack
Daniel Emil Mack
DZDapeng Zhou
Dapeng Zhou
OGOlivier Guillon
Olivier Guillon
RVRobert Vaßen
Robert Vaßen
Thermal barrier coatings (TBCs) are commonly used to protect gas turbine components from high temperatures and oxidation. Such coatings consist of ceramic top coats and metallic bond coats. The mismatch in thermal expansion of the top coat, the bond coat and the component material is one main factor leading to the failure of the coating system. Columnar-structured top coats offer an enhanced tolerance to the strain during thermal cycling. On a flat bond coated surface, these TBCs reach higher thermal cycling performance. However, on rough surfaces, as used for thermal spray coatings, the performance of these thermal barrier coatings seems to be restricted or even stays below the performance of atmospheric-plasma-sprayed (APS) thermal barrier coatings. This low performance is linked to out-of-plane stresses at the interface between the top coat and the bond coat. In this study, a thin additional oxide-dispersion-strengthened (ODS) bond coat with high alumina content provides a reduced mismatch of the coefficient of thermal expansion (CTE) between the top coat and the bond coat. Columnar suspension plasma sprayed (SPS), yttria-stabilized zirconia (YSZ) TBCs were combined with low-CTE ODS bond coats. The behavior of these TBCs was characterized with respect to thermal cycling performance and degradation in a burner-rig facility. The comparison showed an up-to-four-fold increase in the performance of the new system.