Additive laser deposition of YSZ on Ni base superalloy for thermal barrier application
| Autor: | Amol A. Gokhale, U. Savitha, G. Jagan Reddy, V. Srinivas, M. Sundararaman |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Functionally graded materials
Materials science Base (chemistry) NET SHAPING LENS(TM) 02 engineering and technology Temperature cycling Substrate (electronics) 01 natural sciences Thermal barrier coating STABILIZED ZIRCONIA COATINGS Laser engineered net shaping 0103 physical sciences Materials Chemistry Nichrome Composite material Thermal insulation Yttria-stabilized zirconia 010302 applied physics chemistry.chemical_classification Yttria stabilized zirconia ALLOY Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics POWDERS STAINLESS-STEEL Surfaces Coatings and Films Superalloy chemistry Thermal barrier coatings MICROSTRUCTURE 0210 nano-technology Deposition (chemistry) RESISTANCE |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| DOI: | 10.1002/2014GL060121 |
| Popis: | In the present work, the feasibility of additive laser deposition (ALD) of YSZ on 1N625 substrate was studied using two different bond coats (BC) viz. NiCr and NiCrAlY and two different deposition schemes, consisting of direct deposition of YSZ (DI) and compositionally graded (CG) deposition of bond coat-YSZ. These deposits were examined for microstructural features, and their ability to provide thermal barrier to heat flow and to withstand thermal cycling were evaluated. It has been observed that DI and CG NiCr-YSZ coatings survive 240 cycles whereas CG NiCrAlY-YSZ samples survive < 5 thermal cycles between 1100 degrees C and room temperature. The poor thermal cycling resistance of CG NiCrAlY-YSZ coatings is attributed to the formation of a brittle oxide layer at the interface of NiCrAlY and YSZ. Between all four combinations of BC and types of deposition, CG NiCr-YSZ coatings give the maximum temperature drop (350 degrees C) across the thickness when tested at 1000 degrees C as hot face temperature and for 600 s duration which, combined with good thermal cycling resistance, makes them potential candidates as thermal barrier coatings (TBCs) applied by additive laser deposition. |
| Databáze: | OpenAIRE |
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