Header menu link for other important links
X
Additive laser deposition of YSZ on Ni base superalloy for thermal barrier application
, Mahadevan Sundararaman
Published in Elsevier B.V.
2018
Volume: 354
   
Pages: 257 - 267
Abstract
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 <5 thermal cycles between 1100 °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 °C) across the thickness when tested at 1000 °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. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetSurface and Coatings Technology
PublisherData powered by TypesetElsevier B.V.
ISSN02578972
Open AccessNo
Concepts (20)
  •  related image
    Atomic layer deposition
  •  related image
    Functionally graded materials
  •  related image
    Microstructural evolution
  •  related image
    Nickel
  •  related image
    Nickel alloys
  •  related image
    Superalloys
  •  related image
    Thermal cycling
  •  related image
    Thermal insulation
  •  related image
    Yttria stabilized zirconia
  •  related image
    YTTRIUM OXIDE
  •  related image
    Zirconia
  •  related image
    DIRECT DEPOSITION
  •  related image
    Laser depositions
  •  related image
    Laser engineered net shaping
  •  related image
    Maximum temperature
  •  related image
    Microstructural features
  •  related image
    NI-BASE SUPERALLOYS
  •  related image
    THERMAL BARRIER COATING (TBCS)
  •  related image
    THERMAL CYCLING RESISTANCE
  •  related image
    Thermal barrier coatings