The relationship between structural change of thickeners and rheological properties on lubricating grease

Michita Hokao, Kentaro Sonoda, Joichi Sugimura

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Lubricating grease shows the typical rheological properties, such as yield stress, shear thinning and thixotropy. These properties are believed to be originated by changes of thickener structure of grease, though the relationship between the structural change and grease rheology is not fully understood. This study investigates this relationship using lithium 12-hydroxy stearate greases and lithium stearate greases with different thickener concentration, penetration, base oil type, and prototype methods. Rheological property with two pre-shear conditions was evaluated, and thickener structure of greases were observed using an optical microscope, SEM and AFM. Orientation of thickeners and dispersion of thickener aggregations induced by shear were observed using AFM. In addition, it is shown wettability of base oil on thickeners depends on thickener types.

    Original languageEnglish
    Pages (from-to)42-54
    Number of pages13
    JournalToraibarojisuto/Journal of Japanese Society of Tribologists
    Volume64
    Issue number1
    Publication statusPublished - Jan 1 2019

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

    Fingerprint Dive into the research topics of 'The relationship between structural change of thickeners and rheological properties on lubricating grease'. Together they form a unique fingerprint.

    Cite this