Effect of melting state on the thermal shock resistance and thermal conductivity of APS ZrO2-7.5 wt.% Y2O3 coatings

Xuemei Song, Ziwei Liu, Tomi Suhonen, Tommi Varis, Liping Huang, Xuebin Zheng, Yi Zeng

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)

    Abstract

    The microstructures of two types of ZrO2-7.5 wt.% Y2O3 (YSZ) coatings fabricated by air plasma spraying (APS) but containing different amounts of columnar grains were investigated through scanning electron microscopy and electron backscatter diffraction analysis. Differences in the formation mechanisms of columnar and equiaxed grains were characterized using particles collected in a water container, from which it was found that these mechanisms are closely related to the melted state of the in-flight particles. Furthermore, it was found that the higher the columnar grain concentration of an as-sprayed coating, the higher its thermal shock resistance. This means that it is possible to improve the thermal shock resistance of APS YSZ coatings simply by introducing more columnar grains, as this increases their thermal conductivity. Using this knowledge, YSZ coatings with good thermal shock resistance and a thermal conductivity of 0.81 W·(m·K)- 1 at 1100 °C were successfully prepared.
    Original languageEnglish
    Pages (from-to)132-138
    JournalSurface and Coatings Technology
    Volume270
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • air plasma spraying
    • YSZ coatings
    • columnar grains
    • thermal shock resistance
    • thermal conductivity
    • ProperPart
    • ProperTune

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