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2021 Vol.31, Issue 8 Preview Page
Interdiffusion Studies of βNiAl Bond Coats: Understanding the Zr, Pt, and Al Migration Trends and Their Beneficial Effects
Ali Dad Chandio†
,
Nafisul Haque
,
Asif Ahmed Shaikh
Department of Metallurgical Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan
†Corresponding author E-Mail : alidad@neduet.edu.pk (A. D. Chandio, NED Univ. of Eng. and Tech.)
August 2021. pp. 439-444
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Abstract

The oxidation resistance of the diffusion aluminide bond coat (BC) is compromised largely by interdiffusion (ID) effects on coated turbine blades of aeroengines. The present study is designed to understand the influence of ID on βNiAl coatings or BC. In this regard, nickel substrate and CMSX-4 superalloy are deposited. In total, four sets of BCs are developed, i.e. pure βNiAl (on Ni substrate), simple βNiAl (on CMSX-4 substrate), Zr-βNiAl (on CMSX-4 substrate) and Pt-βNiAl (on CMSX-4 substrate). The main aim of this study is to understand the interdiffusion of Al, Zr and Pt during preparation and oxidation. In addition, the beneficial effects of both Zr and platinum are assessed. Pure βNiAl and simple βNiAl show Ni-outdiffusion, whereas for platinum inward diffusion to the substrate is noticed under vacuum treatment. Interestingly, Zr-βNiAl shows the least ID in all BCs and exhibit stability under both vacuum and oxidation treatments. However, its spallation resistance is slightly lower than that of Pt-βNiAl BC. All BCs show similar oxide growth trends, except for Zr-βNiAl, which exhibits two-stage oxidations, i.e. transient and steady-state. Moreover, it is suggested that the localized spallation in all BCs is caused by βNiAl - γ’-Ni3Al transformation.

Keywords
βNiAl
inter-diffusion
zirconium doping
Ni trends
barrier effect
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 31
  • No :8
  • Pages :439-444
  • Received Date : 2021-05-05
  • Revised Date : 2021-07-15
  • Accepted Date : 2021-07-18
  • DOI :https://doi.org/10.3740/MRSK.2021.31.8.439
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