Additive laser deposition of YSZ on Ni base superalloy for thermal barrier application

In the present work, the feasibility of additive laser deposition (ALD) of YSZ on IN625 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...

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Bibliographic Details
Published in:Surface & coatings technology 2018-11, Vol.354, p.257-267
Main Authors: Savitha, U., Srinivas, V., Jagan Reddy, G., Gokhale, Amol A., Sundararaman, M.
Format: Article
Language:English
Subjects:
Coatings
Functionally graded materials
Heat transmission
Insulation
Laser deposition
Laser engineered net shaping
Lasers
Nickel base alloys
Substrates
Superalloys
Thermal barrier coatings
Thermal cycling
Thermal insulation
Thermal resistance
Yttria stabilized zirconia
Zirconium alloys
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Summary:In the present work, the feasibility of additive laser deposition (ALD) of YSZ on IN625 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
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.08.089