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High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate

Article dans une revue avec comité de lecture
Author
KROMER, Robin
227673 Laboratoire d'Études et de Recherches sur les Matériaux, les Procédés et les Surfaces [IRTES - LERMPS]
PEYRE, Patrice
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BERTHE, Laurent
14421 Laboratoire d'Ingénierie des Matériaux [LIM]
31214 Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] [LaMCoS]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
428 Laboratoire pour l'application des lasers de puissance [LALP]
COURAPIED, Damien
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
COSTIL, Sophie
CORMIER, Jonathan
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]

URI
http://hdl.handle.net/10985/14076
DOI
10.1016/j.surfcoat.2018.01.006
Date
2018
Journal
Surface and Coatings Technology

Abstract

Thermal barrier coating systems are usually build-up with bond coats to ensure a good adhesion of the ceramic top coat and to protect the substrate against oxidation and corrosion. Such system is often subjected to complex thermo-mechanical loading. Because of the very different damage processes encountered during service operations, a simplified system was investigated by removing the bond-coat. Recently adhesion bond strength was enhanced using laser surface texturing of the substrate in thermal spraying processes. Atmospheric plasma spray yttria-stabilized-zirconia thermal barrier coating system was deposited on the Ni-based AM1 single crystalline superalloy without bond coat. Adhesion bond strength was already increased compared to conventional processing method. Top coat durability was evaluated at high temperature and damage mechanisms were studied. Isothermal and cyclic oxidation tests showed durability of 1000 h and 400 cycles at 1100 °C. The oxidation mechanisms at the substrate/top coat interface changed due to fast solidification during the laser texturing process. Then, TBC system was studied under high temperature mechanical solicitation in tension creep. The textured interfaces were not damaged after 1% creep strain while top-coat/substrate interfacial cracking was observed for grit-blasted specimens. Moreover, no preferential crack development in the substrate was observed. Patterns provided an enhanced adhesion by changing the stress distribution near the interface.

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