On the Shear Stability of Dry and Water-Contaminated Calcium Sulfonate Complex Lubricating Greases

Yuxin Zhou*, Rob Bosman, Piet M. Lugt

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    1 Citation (Scopus)
    12 Downloads (Pure)

    Abstract

    Calcium sulfonate complex greases have excellent extreme pressure, antiwear, and anticorrosion properties and are widely applied in rolling bearings, particularly in humid environments. In this article, the shear stability of dry and water-contaminated lubricating calcium sulfonate complex greases is described using a novel aging method. Unlike lithium and polyurea greases, no shear softening is observed for the dry greases due to the good mechanical stability of the particle-like thickener structure. For water-contaminated greases, no water separation was found during the prolonged aging. Instead, a homogeneous water–calcium sulfonate thickener micellar structure is generated. These micelles function as apparent thickeners and effectively increase the thickener concentration, which thickens the grease. This may explain why calcium sulfonate complex grease has excellent water absorption properties.

    Original languageEnglish
    Pages (from-to)626-634
    Number of pages9
    JournalTribology transactions
    Volume62
    Issue number4
    Early online date30 Apr 2019
    DOIs
    Publication statusPublished - 4 Jul 2019

    Fingerprint

    greases
    Lubricating greases
    sulfonates
    calcium
    Calcium
    shear
    Water
    water
    Bearings (structural)
    thickeners
    Aging of materials
    Mechanical stability
    Micelles
    Water absorption
    Lithium
    softening
    micelles
    lithium

    Keywords

    • UT-Hybrid-D
    • rheology
    • water contamination
    • Grease application

    Cite this

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    title = "On the Shear Stability of Dry and Water-Contaminated Calcium Sulfonate Complex Lubricating Greases",
    abstract = "Calcium sulfonate complex greases have excellent extreme pressure, antiwear, and anticorrosion properties and are widely applied in rolling bearings, particularly in humid environments. In this article, the shear stability of dry and water-contaminated lubricating calcium sulfonate complex greases is described using a novel aging method. Unlike lithium and polyurea greases, no shear softening is observed for the dry greases due to the good mechanical stability of the particle-like thickener structure. For water-contaminated greases, no water separation was found during the prolonged aging. Instead, a homogeneous water–calcium sulfonate thickener micellar structure is generated. These micelles function as apparent thickeners and effectively increase the thickener concentration, which thickens the grease. This may explain why calcium sulfonate complex grease has excellent water absorption properties.",
    keywords = "UT-Hybrid-D, rheology, water contamination, Grease application",
    author = "Yuxin Zhou and Rob Bosman and Lugt, {Piet M.}",
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    year = "2019",
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    On the Shear Stability of Dry and Water-Contaminated Calcium Sulfonate Complex Lubricating Greases. / Zhou, Yuxin; Bosman, Rob; Lugt, Piet M.

    In: Tribology transactions, Vol. 62, No. 4, 04.07.2019, p. 626-634.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - On the Shear Stability of Dry and Water-Contaminated Calcium Sulfonate Complex Lubricating Greases

    AU - Zhou, Yuxin

    AU - Bosman, Rob

    AU - Lugt, Piet M.

    N1 - Taylor & Francis deal

    PY - 2019/7/4

    Y1 - 2019/7/4

    N2 - Calcium sulfonate complex greases have excellent extreme pressure, antiwear, and anticorrosion properties and are widely applied in rolling bearings, particularly in humid environments. In this article, the shear stability of dry and water-contaminated lubricating calcium sulfonate complex greases is described using a novel aging method. Unlike lithium and polyurea greases, no shear softening is observed for the dry greases due to the good mechanical stability of the particle-like thickener structure. For water-contaminated greases, no water separation was found during the prolonged aging. Instead, a homogeneous water–calcium sulfonate thickener micellar structure is generated. These micelles function as apparent thickeners and effectively increase the thickener concentration, which thickens the grease. This may explain why calcium sulfonate complex grease has excellent water absorption properties.

    AB - Calcium sulfonate complex greases have excellent extreme pressure, antiwear, and anticorrosion properties and are widely applied in rolling bearings, particularly in humid environments. In this article, the shear stability of dry and water-contaminated lubricating calcium sulfonate complex greases is described using a novel aging method. Unlike lithium and polyurea greases, no shear softening is observed for the dry greases due to the good mechanical stability of the particle-like thickener structure. For water-contaminated greases, no water separation was found during the prolonged aging. Instead, a homogeneous water–calcium sulfonate thickener micellar structure is generated. These micelles function as apparent thickeners and effectively increase the thickener concentration, which thickens the grease. This may explain why calcium sulfonate complex grease has excellent water absorption properties.

    KW - UT-Hybrid-D

    KW - rheology

    KW - water contamination

    KW - Grease application

    U2 - 10.1080/10402004.2019.1588445

    DO - 10.1080/10402004.2019.1588445

    M3 - Article

    AN - SCOPUS:85065200233

    VL - 62

    SP - 626

    EP - 634

    JO - Tribology transactions

    JF - Tribology transactions

    SN - 1040-2004

    IS - 4

    ER -