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 journalArticlepeer-review

    29 Citations (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

    Bibliographical note

    Funding Information:
    This research was supported by the Nano Material Technology Development Program through the National Research Foundation (NRF) of Korea, funded by the Ministry of Science and ICT ( 2018M3A7B8061661 ); Technology Development Program to Solve Climate Changes of the NRF, funded by the Ministry of Science , ICT , and Future Planning ( 2017M1A2A2044933 ); Doosan Heavy Industries & Construction Co. ; Agency for Defense Development , Republic of Korea ( UD170107GD ); Korea Electric Power Co. ( R17XA05-57 ) and Korea University .

    Funding Information:
    This research was supported by the Nano Material Technology Development Program through the National Research Foundation (NRF) of Korea, funded by the Ministry of Science and ICT (2018M3A7B8061661); Technology Development Program to Solve Climate Changes of the NRF, funded by the Ministry of Science, ICT, and Future Planning (2017M1A2A2044933); Doosan Heavy Industries & Construction Co.; Agency for Defense Development, Republic of Korea (UD170107GD); Korea Electric Power Co. (R17XA05-57) and Korea University.

    Publisher Copyright:
    © 2019

    Keywords

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

    ASJC Scopus subject areas

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

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