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    STP1575

    Benchmark of Alternative Lubricants for Hydraulic Systems

    Published: 2014


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    Abstract

    Different ester-based (TMP-& Diester) and polyglycol-based formulations in ISO VG22-46 were compared in terms of their tribological profile by using different tribological tests. Except for the reference fluid based on hydrocarbons, most of the fluids tested met the bio-no-tox criteria. The 6061-T6 aluminum alloy (uncoated and coated by different types of conversion coatings), a hypereutectic aluminum-silicon alloy Al16Si5Ni, and an alternative AlFeXY alloy (uncoated) were tested under mixed/ boundary lubrication with the commercially available EALs by an oscillation (SRV-type) test at 80°C using SAE E52100 steels and by a unidirectional sliding using SAE E52100 roller sliding at RT and 80°C. Appropriate combinations of aluminum alloys (coated or uncoated) and commercially available EALs have the potential to compete with conventional tribo-system like steel/steel lubricated with mineral hydraulic fluids under mixed/boundary lubrication.

    Keywords:

    bio-no-tox, ester, polyglycol, environmentally acceptable lubricant, hydraulic, AlFeXY, conversion coating, 6061 aluminum, plasma electrolytic oxidation


    Author Information:

    Nakase, Takuya
    Material Engineering Sect, Basic Technology R&D Center, KYB Corporation, Kanagawa-ken,

    Department of Mechanical Engineering, Tokyo Univ. of Science, Tokyo,

    Woydt, Mathias
    Head of Division 6.3 Tribology and Wear Protection, BAM Federal Institute for Materials Research and Testing, Berlin,

    Kato, Shinji
    Manager, Material Engineering Sect, Basic Technology R&D Center, KYB Corporation, Kanagawa-ken,

    Sasaki, Shinya
    Professor, Department of Mechanical Engineering, Tokyo Univ. of Science,


    Committee/Subcommittee: D02.12

    DOI: 10.1520/STP157520130182