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Benchmark of Alternative Lubricants for Hydraulic Systems
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.
bio-no-tox, ester, polyglycol, environmentally acceptable lubricant, hydraulic, AlFeXY, conversion coating, 6061 aluminum, plasma electrolytic oxidation
Nakase, Takuya Department of Mechanical Engineering, Tokyo Univ. of Science, Tokyo,
Material Engineering Sect, Basic Technology R&D Center, KYB Corporation, Kanagawa-ken,
Head of Division 6.3 Tribology and Wear Protection, BAM Federal Institute for Materials Research and Testing, Berlin,
Manager, Material Engineering Sect, Basic Technology R&D Center, KYB Corporation, Kanagawa-ken,
Professor, Department of Mechanical Engineering, Tokyo Univ. of Science,