Development of nano-coating film using laser peening and evaluation of tribo performance

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03837
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18040:Machine elements and tribology-related
• Research Institution: Okayama University
• Principal Investigator: Fujii Masahiro 岡山大学, 環境生命自然科学学域, 教授 (80209014)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 表面改質 / レーザピーニング / テクスチャー / グラファイト / 機械要素 / トライボロジー / 摩擦

Outline of Final Research Achievements

To reduce power loss in power transmission mechanical elements, various surface coatings and surface texturing methods have been attempted. However, it is difficult for these methods to maintain power loss reduction effects over a long period, especially in tribological elements used under high load and high sliding conditions, such as gears. In this study, dimples were formed on the surface of tribological elements using laser peening, and graphite particles, which are expected to reduce friction, were firmly attached simultaneously. This created an overall low-friction surface. Additionally, the load conditions under which the texture formed by laser peening would be effective in sliding rolling contact conditions were investigated, and guidelines for optimizing the texture shape were presented.

Free Research Field

機械要素設計・トライボロジー

Academic Significance and Societal Importance of the Research Achievements

近年ますます要求が高まっている機械システムの小型化・省力化のためには，それぞれのトライボ機素の表面耐久性の格段の向上と動力損失の低減が必須であり，その実現には従来技術を凌駕する技術の開発が求められる．本研究では，レーザピーニングを援用してトライボ機素の表面強度向上に加えて，表面テクスチャの形成と低摩擦粒子の付着を同時に行い，表面強さと表面潤滑性の両者を向上させ得る表面創成技術の基礎となる成果を得た．