Cavitation wear characteristics of Al2O3-ZrO2-ceramic coatings deposited by APS and HVOF -processes

Jarkko Kiilakoski, Frantisek Lukac, Heli Koivuluoto, Petri Vuoristo

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

    4 Citations (Scopus)

    Abstract

    Thermally sprayed ceramic coatings are used in environments requiring good wear- and corrosion resistance among others. However, a typical issue with ceramic coatings is their low impact resistance and tendency to fail catastrophically by cracking. In bulk ceramics, the Al2O3-ZrO2–composition has been of interest for long since already small additions of ZrO2 into Al2O3 have shown improvements in fracture toughness compared to pure Al2O3. Efforts are being made to induce this increased resistance to fracturing in thermally sprayed coatings as well, resulting in higher wear resistance due to a more predictable behavior and damage-tolerance. In this work, Al2O3-ZrO2-coatings have been deposited by atmospheric plasma spray (APS) and high-velocity oxy-fuel spray (HVOF) processes. The wear characteristics of the coatings were evaluated with cavitation erosion, delving into the mechanics of the erosion and the resulting microstructural changes in the coatings. Evidence of phase transformation of t-ZrO2 to m-ZrO2 was found during the erosion. The HVOF-sprayed coating exhibited greater wear resistance against the cavitating bubbles due to its finer microstructure.
    Original languageEnglish
    Title of host publicationInternationl Thermal Spray Conference ITSC 2017, Conference Proceedings
    Subtitle of host publication June 7-9, 2017, Düsseldorf, Germany.
    Place of PublicationDüsseldorf
    PublisherDVS Media GmbH
    Pages928-933
    Number of pages6
    Volume336
    ISBN (Electronic)978-3-96144-000-9
    Publication statusPublished - 9 Jun 2017
    Publication typeB3 Non-refereed article in conference proceedings
    EventInternational Thermal Spray Conference -
    Duration: 1 Jan 1900 → …

    Publication series

    NameDVS-Berichte / DVS - Deutscher Verband für Schweißen und Verwandte Verfahren e.V.
    PublisherDVS Media GmbH
    ISSN (Electronic)0418-9639

    Conference

    ConferenceInternational Thermal Spray Conference
    Period1/01/00 → …

    Keywords

    • Thermal spray coating
    • HVOF spraying
    • Cavitation damage
    • alumina-yttria-stabilized zirconia
    • Erosion testing
    • PLASMA SPRAY

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Surfaces, Coatings and Films

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