Changes in high-temperature thermal properties of modified YSZ with various rare earth doping elements

Hakbeom Jeon, Inhwan Lee, Yoonsuk Oh

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

To protect the high-temperature components of gas turbines, 6–8 wt.% yttria stabilised zirconia (YSZ) has been extensively used as a thermal barrier coating (TBC) material. However, its application is severely limited at high temperatures because of zirconia phase transition and sintering densification above 1200 °C. This study developed modified YSZ with enhanced high-temperature thermal properties owing to the addition of various rare-earth doping elements. Among the various rare earth-doped compositions, all the thermal properties were significantly improved in compositions containing scandium, gadolinium, and dysprosium. Furthermore, in the selected compositions, the high-temperature thermal properties were analysed under heat treatment conditions of 1300 °C, with a target turbine inlet temperature (TIT) of 1500 °C. The high-temperature phase stability of the tetragonal phase was significantly improved in the newly developed compositions, and they exhibited glass-like low thermal conductivity (∼0.984 W/mK) due to the influence of lattice distortion caused by the differences in the substituent-ion mass and size, and the oxygen vacancies. Moreover, there was notable improvement in the thermal expansion coefficient (∼11 × 10−6/K) and resistance to high-temperature densification.

Original languageEnglish
Pages (from-to)8177-8185
Number of pages9
JournalCeramics International
Volume48
Issue number6
DOIs
Publication statusPublished - 2022 Mar 15

Keywords

  • High-temperature thermal property
  • Modified YSZ
  • Thermal barrier coatings
  • Thermal conductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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