Improved mechanical properties by nanoreinforced HVOF-sprayed ceramic composite coatings

Erja Turunen, Tommi Varis, Tom E. Gustafsson, Jari Keskinen, Pertti Lintunen, Pekka Lintula, Simo-Pekka Hannula

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    HVOF-sprayed ceramic coatings can be considered as potential candidates for applications where good chemical and corrosion resistance of ceramics is needed.Due to the less porous structure of the HVOF-sprayed coating as compared to the plasma sprayed one, the protection capability of the coating is increased.Despite the dense structure, the coating properties are inferior as compared to bulk ceramics because of pores and microcracks, which influence adversely the coating properties (i.e., toughness, hardness and wear resistance).Improved mechanical properties have widely been demonstrated for bulk nanocrystalline materials.Especially with ceramic materials the decreasing of grain size has been found to be favorable.Dense nanostructured ceramic coatings containing various nanostructured particles were manufactured by HVOF-spraying by using an HV-2000 spray gun.Mechanical properties, especially elastic modulus and relative fracture toughness, were studied.The techniques used were instrumented nanoindentation and KIC evaluation.As a result coatings with nearly 100% improvements in relative fracture toughness were produced for nanoreinforced composite coating.
    Original languageEnglish
    Title of host publicationApplied Material Research at VTT
    Subtitle of host publicationSymposium on Applied Materials
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages188-199
    ISBN (Electronic)951-38-6312-3
    ISBN (Print)951-38-6311-5
    Publication statusPublished - 2006
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventInternal Symposium on Applied Materials - Espoo, Finland
    Duration: 8 Jun 20068 Jun 2006

    Publication series

    SeriesVTT Symposium
    Number244
    ISSN0357-9387

    Conference

    ConferenceInternal Symposium on Applied Materials
    Country/TerritoryFinland
    CityEspoo
    Period8/06/068/06/06

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