Tribological Characteristics of Environmentally Acceptable Lubricants under Natural Seawater Mixing conditions

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04578
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Jibiki Tatsuhiro 東京海洋大学, 学術研究院, 教授 (40322094)
• Co-Investigator(Kenkyū-buntansha): 藤野 俊和 東京海洋大学, 学術研究院, 准教授 (70508514) ; 菅原 隆志 東京海洋大学, 海洋工学部, 助手 (90456319)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 環境対応型潤滑油 / 天然海水 / トライボロジー特性

Outline of Final Research Achievements

The Tribological characteristics of the Environmentally Acceptable Lubricants (hereinafter abbreviated as EAL) mixed with natural seawater were compared with the conventional oil using a 3-pin on-disk friction tester.Using the propeller shaft material and the stern tube bearing material as specimens, the coefficient of friction was measured under various sliding conditions and plotted on a Stribeck diagram for analysis and evaluation.As a result, when seawater was mixed in with the unsaturated ester oil, the saturated ester oil, and the conventional oil, the coefficient of friction increased in a wide range of bearing constants.The Tribological characteristics of EAL were unstable depending on the sliding conditions.No particular effect of biodegradation was observed under the conditions of this experiment.

Free Research Field

トライボロジー

Academic Significance and Societal Importance of the Research Achievements

EALのトライボロジー特性については、ほとんど公表されていないため、造船メーカやユーザにとっては手探りの状態が続いている。従来油との相違点や海水混入によるトライボロジー特性への影響を調査し、その結果を一刻も早く公表し、更なる改良を求めるための根拠を示し、国内の潤滑油メーカにおいては、国産のEAL開発の加速化を促し、EALの更なる信頼性向上と品質向上を求めるものであり、その学術的意義や社会的意義は大きい。