Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Growth Behavior of Thermally Grown Oxide Layer with Bond Coat Species in Thermal Barrier Coatings

  • Jung, Sung Hoon (School of Materials Science and Engineering, Changwon National University) ;
  • Jeon, Soo Hyeok (School of Materials Science and Engineering, Changwon National University) ;
  • Park, Hyeon-Myeong (School of Materials Science and Engineering, Changwon National University) ;
  • Jung, Yeon Gil (School of Materials Science and Engineering, Changwon National University) ;
  • Myoung, Sang Won (Corporate R&D Institute, Doosan Heavy Industries and Construction) ;
  • Yang, Byung Il (Corporate R&D Institute, Doosan Heavy Industries and Construction)
  • Received : 2018.03.07
  • Accepted : 2018.05.29
  • Published : 2018.07.31
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Abstract

The effects of bond coat species on the growth behavior of thermally grown oxide (TGO) layer in thermal barrier coatings (TBCs) was investigated through furnace cyclic test (FCT). Two types of feedstock powder with different particle sizes and distributions, AMDRY 962 and AMDRY 386-4, were used to prepare the bond coat, and were formed using air plasma spray (APS) process. The top coat was prepared by APS process using zirconia based powder containing 8 wt% yttria. The thicknesses of the top and bond coats were designed and controlled at 800 and $200{\mu}m$, respectively. Phase analysis was conducted for TBC specimens with and without heat treatment. FCTs were performed for TBC specimens at $1121^{\circ}C$ with a dwell time of 25 h, followed by natural air cooling for 1 h at room temperature. TBC specimens with and without heat treatment showed sound conditions for the AMDRY 962 bond coat and AMDRY 386-4 bond coat in FCTs, respectively. The growth behavior of TGO layer followed a parabolic mode as the time increased in FCTs, independent of bond coat species. The influences of bond coat species and heat treatment on the microstructural evolution, interfacial stability, and TGO growth behavior in TBCs are discussed.

Keywords

References

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