Process optimization and performance of nanoreinforced HVOF-sprayed ceramic coatings

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

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Improved mechanical properties have widely been demonstrated for bulk nanocrystalline materials. Especially with ceramic materials decreasing of grain size has been found to be favourable. Nanocrystalline materials offer better thermal shock resistance, lower thermal conductivity and better wear resistance than their conventional counterparts. For nanostrucutured bulk composites with nanosized metal precipitations in the nanocrystalline ceramic matrix improved fracture toughness properties have also been reported. An increasing effort has been made to transfer such improvements also into thermal sprayed ceramic coatings. Mainly work has been carried out with plasma spray systems, but recently it has been shown that HVOF (High Velocity Oxy-Fuel) process can produce much denser coatings and hence better environmental protection capacity. In this paper we describe the development of HVOF sprayed nanocrystalline Al2O3-composite coatings, where the grain size of Al2O3 has been decreased and a few percents of alloying elements has been added in order to toughen the coating.
    Original languageEnglish
    Title of host publicationProceedings of 16th International Plansee Seminar
    Subtitle of host publicationPowder metallurgical high performance materials
    Place of PublicationReutte
    Pages422 - 433
    Volume1
    Publication statusPublished - 2005
    MoE publication typeA4 Article in a conference publication
    Event16th International Plansee Seminar - Reutte, Austria
    Duration: 30 May 20053 Jun 2005

    Conference

    Conference16th International Plansee Seminar
    CountryAustria
    CityReutte
    Period30/05/053/06/05

    Keywords

    • thermal spraying
    • HVOF
    • process optimization
    • alumina
    • coatings
    • ceramic coatings
    • nanostructures

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