Effect of La2O3 Addition on Interface Chemistry Between 4YSZ Top Layer and Ni Based Alloy Bond Coat in Thermal Barrier Coating by EB PVD
- Authors
- Park, Chan-Young; Yang, Young-Hwan; Kim, Seong-Won; Lee, Sung-Min; Kim, Hyung-Tae; Jang, Byung-Koog; Lim, Dae-Soon; Oh, Yoon-Suk
- Issue Date
- 11월-2014
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- La2O3; YSZ; EB PVD; Thermal Barrier Coating (TBC); Interdiffusion; NiCrAlY
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.11, pp.8659 - 8664
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 14
- Number
- 11
- Start Page
- 8659
- End Page
- 8664
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97027
- DOI
- 10.1166/jnn.2014.10000
- ISSN
- 1533-4880
- Abstract
- The effect of a 5 mol% La2O3 addition on the forming behavior and compositional variation at interface between a 4 mol% Yttria (Y2O3) stabilized ZrO2 (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 mor/o La2O3-added 4YSZ coating (similar to 1.6 W/m.k at 1100 degrees C) was lower than a 4YSZ coating (similar to 3.2 W/m.k at 1100 degrees C) alone.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.