Effect of la2o3 addition on interface chemistry between 4YSZ top layer and Ni based alloy bond coat in thermal barrier coating by EB PVD

Chan Young Park, Young Hwan Yang, Seong Won Kim, Sung Min Lee, Hyung Tae Kim, Byung Koog Jang, Dae-Soon Lim, Yoon Suk Oh

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The effect of a 5 mol% La203 addition on the forming behavior and compositional variation at interface between a 4 mol% Yttria (Y203) stabilized Zr02 (4YSZ) top coat and bond coat (NiCrAlY,) as a thermal barrier coating (TBC) has been investigated. Top coats were deposited by electron beam physical vapor deposition (EB PVD) onto a super alloy (Ni-Cr-Co-Al) substrate without pre-oxidation of the bond coat. Top coats are found to consist of dense columnar grains with a thin interdiffusion layer between metallic bond coats. In the as-received 4YSZ coating, a thin interdiffusion zone at the interface between the top and bond coats was found to consist of a Ni-Zr intermetallic compound with a reduced quantity of Y. Al or O elements. On the other hand, in the case of an interdiffusion area of 5 mol% La2O3-added 4YSZ coating, it was found that the complicated composition and structure with La-added YSZ and Ni-Al rich compounds separately. The thermal conductivity of 5 mol% La203-added 4YSZ coating (∼ 1.6 W/m - k at 1100 °C) was lower than a 4YSZ coating (∼ 3.2 W/m • k at 1100 °C) alone.

Original languageEnglish
Pages (from-to)8659-8664
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number11
Publication statusPublished - 2014 Nov 1


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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