Fabrication and characterization of 7.5 wt% Y2O3-ZrO2 thermal barrier coatings deposited by suspension plasma spray

Won Jun Lee, Yoon Suk Oh, Sung Min Lee, Hyung Tae Kim, Dae Soon Lim, Seongwon Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Considerable research efforts have been explored attempting to enhance the thermal durability of thermal barrier coatings (TBCs) at the high operating temperatures of gas turbines. In this study, the suspension plasma spray (SPS) process was applied to produce TBCs with a segmented structure by using an yttria-stabilized zirconia (YSZ) suspension. Four different experiment sets were carried out by controlling the ratio between surface roughness of the bond coat and feed stock size (Ra/D50) in order to examine the effect of Ra/D50 ratio on the microstructure of SPS-prepared coatings. When the Ra/D50 had a high value of 11.8, a deposited thick coating turned out to have a cone-type columnar microstructure. In contrast, at the low Ra/D50 values of 2.9 and 0.18, a deposited thick coating appeared to have a dense, vertically-cracked microstructure. However, with the very low Ra/D50 value of 0.05 the coating was delaminated.

Original languageEnglish
Pages (from-to)598-604
Number of pages7
JournalJournal of the Korean Ceramic Society
Issue number6
Publication statusPublished - 2014 Nov 12


  • Segmented microstructure
  • Suspension plasma spray
  • Thermal barrier coatings
  • Yttria-stabilized zirconia(YSZ)

ASJC Scopus subject areas

  • Ceramics and Composites


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