Fabrication of yttria-stabilized zirconia aerogel for high-performance thermal barrier coating

Sungwon Yoon, Gwon Deok Han, Dong Young Jang, Jun Woo Kim, Dong Hwan Kim, Joon Hyung Shim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, we successfully fabricated an yttria-stabilized zirconia (YSZ) aerogel using the sol-gel method and CO2 supercritical drying. We confirmed the successful thermal insulation function as a thermal barrier coating (TBC) on a high-temperature gas turbine surface. In order to evaluate the performance of the YSZ aerogel, the thermal conductivity and temperature profile were measured in addition to microstructure observation by scanning electron microscopy. The thermal conductivity of the YSZ aerogel was 0.212 W/m·K at 1000 °C, which is significantly lower than the reference values of YSZ materials. The low heat conduction is attributed to heat insulation by the fine pores and low heat conduction through the nanopore spaces in the aerogel structure. The heat insulation of the YSZ aerogel as the TBC was evaluated on a gas turbine blade material by monitoring surface temperature profiles on a heater at 300–700 °C. The heat-blocking performance of the YSZ aerogel coating was superior to that of a conventional YSZ TBC (by 30–50%). By comparison with a numerical calculation, the thermal conductivity of the YSZ aerogel coating was estimated to be 0.05 W/m·K, which is significantly lower (30–40 times) than that of the YSZ TBC used for commercial gas turbines. The porous structure of the aerogel was well preserved even after the high-temperature test confirming the good thermal stability. This study demonstrated that the YSZ aerogel is promising as a gas turbine TBC material.

Original languageEnglish
Pages (from-to)1430-1434
Number of pages5
JournalJournal of Alloys and Compounds
Volume806
DOIs
Publication statusPublished - 2019 Oct 25

Fingerprint

Thermal barrier coatings
Aerogels
Yttria stabilized zirconia
Fabrication
Gas turbines
Thermal insulation
Thermal conductivity
Heat conduction
Coatings
Temperature
Nanopores
Sol-gel process
Turbomachine blades
Drying
Thermodynamic stability
Microstructure
Scanning electron microscopy

Keywords

  • Aerogel
  • Gas turbine
  • Thermal barrier coating
  • Yttria-stabilized zirconia

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Fabrication of yttria-stabilized zirconia aerogel for high-performance thermal barrier coating. / Yoon, Sungwon; Han, Gwon Deok; Jang, Dong Young; Kim, Jun Woo; Kim, Dong Hwan; Shim, Joon Hyung.

In: Journal of Alloys and Compounds, Vol. 806, 25.10.2019, p. 1430-1434.

Research output: Contribution to journalArticle

Yoon, Sungwon ; Han, Gwon Deok ; Jang, Dong Young ; Kim, Jun Woo ; Kim, Dong Hwan ; Shim, Joon Hyung. / Fabrication of yttria-stabilized zirconia aerogel for high-performance thermal barrier coating. In: Journal of Alloys and Compounds. 2019 ; Vol. 806. pp. 1430-1434.
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AB - In this study, we successfully fabricated an yttria-stabilized zirconia (YSZ) aerogel using the sol-gel method and CO2 supercritical drying. We confirmed the successful thermal insulation function as a thermal barrier coating (TBC) on a high-temperature gas turbine surface. In order to evaluate the performance of the YSZ aerogel, the thermal conductivity and temperature profile were measured in addition to microstructure observation by scanning electron microscopy. The thermal conductivity of the YSZ aerogel was 0.212 W/m·K at 1000 °C, which is significantly lower than the reference values of YSZ materials. The low heat conduction is attributed to heat insulation by the fine pores and low heat conduction through the nanopore spaces in the aerogel structure. The heat insulation of the YSZ aerogel as the TBC was evaluated on a gas turbine blade material by monitoring surface temperature profiles on a heater at 300–700 °C. The heat-blocking performance of the YSZ aerogel coating was superior to that of a conventional YSZ TBC (by 30–50%). By comparison with a numerical calculation, the thermal conductivity of the YSZ aerogel coating was estimated to be 0.05 W/m·K, which is significantly lower (30–40 times) than that of the YSZ TBC used for commercial gas turbines. The porous structure of the aerogel was well preserved even after the high-temperature test confirming the good thermal stability. This study demonstrated that the YSZ aerogel is promising as a gas turbine TBC material.

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