The effect of superalloy substrate on the behaviour of high-purity low-density air plasma sprayed thermal barrier coatings
| Autor: | M.A. Helminiak, N. M. Yanar, Frederick S. Pettit, T.A. Taylor, Gerald H. Meier |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Metals and Alloys chemistry.chemical_element Substrate (chemistry) Condensed Matter Physics Superalloy Thermal barrier coating chemistry Mechanics of Materials Plasma sprayed Aluminium visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Low density Ceramic Inconel |
| Zdroj: | Materials at High Temperatures. 29:264-271 |
| ISSN: | 1878-6413 0960-3409 |
| Popis: | Several superalloy-bond coat couples were prepared without ceramic topcoat layers to better understand the effects of superalloy substrate on the oxidation behaviour of NiCoCrAlY bond coats. The same composition NiCoCrAlY bond coats were deposited on three superalloy substrates (Inconel 718, Haynes 188 and Rene’ N5) via argon-shrouded plasma spraying. The specimens were exposed to cyclic oxidation in laboratory air at 1100°C in a bottom loading furnace. Scaling behaviour and rate of aluminum depletion were compared between the various specimens. The bond coats on all three superalloys experienced some form of chemical failure after an extended number of cycles. The number of cycles until chemical failure was shortest for the IN718 specimen followed by the HA188 specimen, both of which experienced complete bond coat chemical failure, and then the Rene’ N5 specimen, which experienced localized chemical failure. The cycles to chemical failure coincide with the cycles to thermal barrier coating (TBC) ... |
| Databáze: | OpenAIRE |
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