Lifetime of environmental/thermal barrier coatings deposited on a niobium silicide composite with boron containing M7Si6-based bond coat
| Autor: | Stéphane Mathieu, Michel Vilasi, Reinhold Braun, Stefan Drawin, Uwe Schulz, Léo Portebois, Annika Lange |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Oxide 02 engineering and technology 01 natural sciences Zirconate Thermal barrier coating chemistry.chemical_compound 0103 physical sciences Silicide Materials Chemistry Environmental Chemistry Cubic zirconia Ceramic Composite material Yttria-stabilized zirconia 010302 applied physics Mechanical Engineering Metallurgy Metals and Alloys General Medicine Sputter deposition 021001 nanoscience & nanotechnology Surfaces Coatings and Films chemistry 13. Climate action Mechanics of Materials visual_art visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Materials and Corrosion. 67:1252-1260 |
| ISSN: | 0947-5117 |
| DOI: | 10.1002/maco.201608929 |
| Popis: | Environmental/thermal barrier coatings (E/TBCs) of yttria partially stabilised zirconia (YSZ), gadolinium zirconate (GZO) and a combination of Y2SiO5 and GZO were applied on a Nb/Nb5Si3-based alloy with the nominal composition of Nb-25Ti-8Hf-2Cr-2Al-16Si (at%). A B-containing M7Si6-based (M=Ti, Nb, Fe, Cr) layer produced by pack cementation was used as bond coat. The ceramic topcoats were manufactured by electron-beam physical vapour deposition (YSZ and GZO) and magnetron sputtering (Y2SiO5).The different E/TBC systems were tested under cyclic oxidation conditions in air at 1100 and 1200°C. Lifetimes exceeding 1000 cycles of 1h dwell time at 1100°C were determined. The YSZ, GZO and combined Y2SiO5+GZO topcoats did not spall off during the maximum exposure time, exhibiting good adherence to the thermally grown oxide scale which consisted of mixed oxides of Fe,Ti, Cr and Nb embedded in silica. For the E/TBC systems with YSZ and GZO which were thermally cycled at 1200°C, lifetimes up to 850 cycles were measured; that of the system with a combined Y2SiO5+GZO topcoat exceeded again 1000 cycles. |
| Databáze: | OpenAIRE |
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