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Improvement of Mechanical Properties of Plasma Sprayed Al2O3–ZrO2–SiO2 Amorphous Coatings by Surface Crystallization

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    SYSNO ASEP0517498
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleImprovement of Mechanical Properties of Plasma Sprayed Al2O3–ZrO2–SiO2 Amorphous Coatings by Surface Crystallization
    Author(s) Medřický, Jan (UFP-V) RID
    Lukáč, František (UFP-V) ORCID
    Csáki, Štefan (UFP-V) ORCID
    Houdková, Š. (CZ)
    Barbosa, M. (DE)
    Tesař, Tomáš (UFP-V) ORCID
    Čížek, Jan (UFP-V) ORCID
    Mušálek, Radek (UFP-V) RID, ORCID
    Kovařík, O. (CZ)
    Chráska, Tomáš (UFP-V) RID, ORCID
    Number of authors10
    Article number3232
    Source TitleMaterials. - : MDPI
    Roč. 12, č. 19 (2019)
    Number of pages17 s.
    Languageeng - English
    CountryCH - Switzerland
    KeywordsAmorphous ; Nanocrystalline ; Plasma spraying ; Vickers microhardness ; Wear resistant
    OECD categoryMaterials engineering
    R&D ProjectsFV30058 GA MPO - Ministry of Industry and Trade (MPO)
    Method of publishingOpen access
    Institutional supportUFP-V - RVO:61389021
    UT WOS000493308500181
    EID SCOPUS85073740251
    AnnotationCeramic Al2O3-ZrO2-SiO2 coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous microstructure which can be transformed to nanocrystalline by further heat treatment. The amorphous/crystalline content ratio and the crystallite sizes can be controlled by a specific choice of heat treatment conditions, subsequently leading to significant changes in the microstructure and mechanical properties of the coatings, such as hardness or wear resistance. In this study, two advanced methods of surface heat treatment were realized by plasma jet or by high energy laser heating. As opposed to the traditional furnace treatments, inducing homogeneous changes throughout the material, both approaches lead to a formation of gradient microstructure within the coatings, from dominantly amorphous at the substrate-coating interface vicinity to fully nanocrystalline near its surface. The processes can also be applied for large-scale applications and do not induce detrimental changes to the underlying substrate materials. The respective mechanical response was evaluated by measuring coating hardness profile and wear resistance. For some of the heat treatment conditions, an increase in the coating microhardness by factor up to 1.8 was observed, as well as improvement of wear resistance behaviour up to 6.5 times. The phase composition changes were analysed by X-ray diffraction and the microstructure was investigated by scanning electron microscopy.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza,, Tel.: 266 052 975
    Year of Publishing2020
    Electronic address
Number of the records: 1