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

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)8659-8664
ページ数6
ジャーナルJournal of nanoscience and nanotechnology
14
11
DOI
出版ステータス出版済み - 11 1 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • バイオエンジニアリング
  • 化学 (全般)
  • 生体医工学
  • 材料科学(全般)
  • 凝縮系物理学

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