Mechanical Integrity of Thermal Barrier Coatings: Coating Development and Micromechanics

Torben Fiedler, Joachim Rösler, Martin Bäker, Felix Hötte, Christoph von Sethe, Dennis Daub, Matthias Haupt, Oskar J. Haidn, Burkard Esser, Ali Gülhan

Publikation: Beitrag in Buch/Bericht/KonferenzbandKapitelBegutachtung

1 Zitat (Scopus)

Abstract

To protect the copper liners of liquid-fuel rocket combustion chambers, a thermal barrier coating can be applied. Previously, a new metallic coating system was developed, consisting of a NiCuCrAl bond-coat and a Rene 80 top-coat, applied with high velocity oxyfuel spray (HVOF). The coatings are tested in laser cycling experiments to develop a detailed failure model, and critical loads for coating failure were defined. In this work, a coating system is designed for a generic engine to demonstrate the benefits of TBCs in rocket engines, and the mechanical loads and possible coating failure are analysed. Finally, the coatings are tested in a hypersonic wind tunnel with surface temperatures of 1350 K and above, where no coating failure was observed. Furthermore, cyclic experiments with a subscale combustion chamber were carried out. With a diffusion heat treatment, no large-scale coating delamination was observed, but the coating cracked vertically due to large cooling-induced stresses. These cracks are inevitable in rocket engines due to the very large thermal-strain differences between hot coating and cooled substrate. It is supposed that the cracks can be tolerated in rocket-engine application.

OriginalspracheEnglisch
TitelNotes on Numerical Fluid Mechanics and Multidisciplinary Design
Herausgeber (Verlag)Springer Science and Business Media Deutschland GmbH
Seiten295-307
Seitenumfang13
DOIs
PublikationsstatusVeröffentlicht - 2021

Publikationsreihe

NameNotes on Numerical Fluid Mechanics and Multidisciplinary Design
Band146
ISSN (Print)1612-2909
ISSN (elektronisch)1860-0824

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