Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue 23-24, Pages 5422-5429Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.06.007
Keywords
Thermal barrier coating; TBC; Adhesion; Thermal cycling fatigue; Thermal shock; Burner rig test
Funding
- Swedish Energy Agency
- Siemens Industrial Turbomachinery AB
- Volvo Aero Corporation
- Royal Institute of Technology
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The adhesion of thermal barrier coatings (TBC) has been studied using the standard method described in ASTM C633, which makes use of a tensile test machine to measure the adhesion. The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrates of Ni-base alloy Hastelloy X. The bond coat (BC) is of a NiCoCrAlY type and the top coat (TC) consists of yttria-stabilised-zirconia. Before the adhesion test, the specimens were subjected to three different heat treatments: 1) isothermal oxidation at 1100 degrees C up to 290 h, 2) thermal cycling fatigue (TCF) at 1100 degrees C up to 300 cycles and 3) thermal shock at similar to 1140 degrees C BC/TC interface temperature up to 1150 cycles. The adhesion of the specimens is reported and accompanied by a microstructural study of the BC and the thermally grown oxides (TGO), as well as a discussion on the influence of BC/TC interfacial damage on adhesion properties of TBC. The adhesion was found to vary with heat treatment, as well as with heat treatment length. (C) 2011 Elsevier B.V. All rights reserved.
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