Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure

Qizheng Cui, Seong Moon Seo, Young Soo Yoo, Zhe Lu, Sang Won Myoung, Yeon Gil Jung, Ungyu Paik

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effects of bond coat composition on the microstructure evolution and thermal durability of thermal barrier coating (TBC) were investigated through cyclic thermal exposure. The microstructure of the bond coat was controlled using various feedstock powders, such as NiCrAlY, NiCoCrAlY, and CoNiCrAlY, which were coated on the Ni-based substrate using a high-velocity oxy-fuel process. The top coat was prepared with high purity feedstock powder (METCO 204 C-XCL) using an air plasma spray (APS) process. The thermal durability of the TBCs was evaluated through the cyclic thermal fatigue (CTF) and thermal shock (TS) tests, including the microstructure evolution, the thermally grown oxide (TGO) growth behavior, and thermomechanical properties. After the CTF and TS tests, the TBC with the Ni-based bond coat showed a longer lifetime performance and less degradation in hardness value than those with the Ni-Co- and Co-Ni-based bond coats. The results indicate that the bond coat composition produce an obvious effect on the thermomechanical properties of the TBC system. The relationship between bond coat composition and thermal durability is extensively discussed, based on the microstructure evolution and element diffusion behavior.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalSurface and Coatings Technology
Volume284
DOIs
StatePublished - 2015 Dec 25

Fingerprint

Thermal barrier coatings
durability
Durability
shock tests
thermal fatigue
coatings
microstructure
Microstructure
Thermal fatigue
thermal shock
Thermal shock
Chemical analysis
Powders
Feedstocks
Oxides
sprayers
purity
hardness
Hardness
degradation

Keywords

  • Bond coat composition
  • Feedstock powder
  • High-velocity oxy-fuel
  • Thermal barrier coating
  • Thermal durability

Cite this

Cui, Qizheng ; Seo, Seong Moon ; Yoo, Young Soo ; Lu, Zhe ; Myoung, Sang Won ; Jung, Yeon Gil ; Paik, Ungyu. / Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure. In: Surface and Coatings Technology. 2015 ; Vol. 284. pp. 69-74.
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Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure. / Cui, Qizheng; Seo, Seong Moon; Yoo, Young Soo; Lu, Zhe; Myoung, Sang Won; Jung, Yeon Gil; Paik, Ungyu.

In: Surface and Coatings Technology, Vol. 284, 25.12.2015, p. 69-74.

Research output: Contribution to journalArticle

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