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Interface stability of NiCrAlY coating without and with a Cr or Mo diffusion barrier on Ti-42Al-5Mn alloy

Corrosion Science, ISSN: 0010-938X, Vol: 188, Page: 109538
2021
  • 28
    Citations
  • 0
    Usage
  • 9
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    28
    • Citation Indexes
      28
  • Captures
    9

Article Description

NiCrAlY coatings without and with a Cr or Mo diffusion barrier were fabricated on Ti-42Al-5Mn alloys by vacuum plasma spray. The microstructure evolution and inter-diffusion behavior were studied via isothermal oxidation tests conducted at 950 °C. The results revealed that substantial inter-diffusion happened in the coating without a diffusion barrier, accelerating the degradation of NiCrAlY coating. While the addition of Cr or Mo diffusion barrier deferred the inter-diffusion phenomenon, and Mo performed much better than Cr due to its high stability. The thickness of the inter-diffusion zone with the Mo diffusion barrier was just about one-fifth of that for NiCrAlY coating after 200 h oxidation. The results could provide comprehensive understanding of the microstructural evolution of NiCrAlY coating, which was essential for controlling the inter-diffusion behavior and improving the durability of NiCrAlY coating.

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