Microstructure and tribological properties of pulsed electric current sintered alumina-zirconia nanocomposites with different solid lubricants

M. Erkin Cura (Corresponding Author), S.-H. Kim, Tatu Muukkonen, Simo Varjus, Antti Vaajoki, O. Söderberg, Tomi Suhonen, Ulla Kanerva, S. Wohn Lee, S.-P. Hannula

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    Abstract

    Dense Al2O3-15 wt% (ZrO2-3 mol%Y2O3) nanocomposites modified with 3 wt% of self-lubricating component (CaF2, BaF2, MoS2, WS2, h-BN, or graphite) were consolidated by pulsed electric current sintering. Their microstructure as well as mechanical and tribological properties were evaluated. During consolidation composition of the self-lubricating components was conserved except for BaF2, which partially melted. The Al2O3/ZrO2(3 mol%Y2O3) matrix showed hardness of 20.35 GPa and Young’s modulus of 320 GPa determined by Vickers indentation. All solid lubricant additives led to a decrease in hardness of the composite. Solid lubricant additives lowered the coefficient of friction (CoF) against alumina at room temperature. In pin-on-disc tests CoF of 0.38–0.42 was measured for all the materials against alumina ball. The lowest CoF of 0.043 was measured for Al2O3/ZrO2(3 mol%Y2O3)/CaF2 in the scratch test against diamond stylus while the matrix material showed lower friction than other materials. The measured wear rates were in the order of 10−12 for Al2O3/ZrO2(3 mol%Y2O3)/CaF2, Al2O3/ZrO2(3 mol%Y2O3)/MoS2, and Al2O3/ZrO2(3 mol%Y2O3)/WS2.
    Original languageEnglish
    Pages (from-to)2093-2105
    Number of pages13
    JournalCeramics International
    Volume39
    Issue number2
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Nanocomposites
    • mechanical propetries
    • Al 2O 3
    • pulsed electric current sintering
    • ProperPart
    • ProperTune

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