Nanoscale Reconstruction of Stribeck Curves by Tribo-Operando Analysis Using Quantum Beam

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H00215
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Hirayama Tomoko 京都大学, 工学研究科, 教授 (00340505)
• Co-Investigator(Kenkyū-buntansha): 山下 直輝 京都大学, 工学研究科, 特定助教 (50847746) ; 日野 正裕 京都大学, 複合原子力科学研究所, 教授 (70314292) ; 篠原 武尚 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 J－PARCセンター, 研究主幹 (90425629) ; 關 義親 東北大学, 多元物質科学研究所, 准教授 (90585209)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: トライボロジー / ストライベック曲線 / 潤滑 / 量子ビーム分析

Outline of Final Research Achievements

In this study, quantum beam analysis was conducted for a sliding surface as the target field to understand lubrication phenomena from the nanoscale. Specifically, the "tribo-operando mechanism," which realizes a tribological condition, was incorporated into the quantum beamline, and the analysis was conducted under actual operating conditions to clarify the micro-behaviour occurring in the sliding field. The "thrust sliding bearing" was selected as the target subject, and the "neutron reflectometry (NR)" was applied to understand the state of the sliding surface under boundary lubrication, and the "neutron phase imaging (NPI)" was applied to understand the shear flow field under fluid lubrication, in order to understand the dynamic behavior of the nano-scale structure of the sliding interface and the lubricating oil in the gap under the tribological condition.

Free Research Field

トライボロジー

Academic Significance and Societal Importance of the Research Achievements

実施課題①においては境界潤滑下での摩擦係数を大きく支配するナノスケール潤滑層の動的構造変化の挙動を、実施課題②においては軸受すきま内せん断場にある潤滑油分子の局所構造をナノスケール学的視点で追うことができた。近年、このようなナノスケールの挙動を積み上げてマクロなトライボロジー性能を予測しようとする流れはより色濃くなっており、そのような近年の動向にマッチする研究成果を上げることができた。