Analysis of wear mechanism of ceramic roaring film with CCD microscope tribo-system

CCD显微镜摩擦系统分析陶瓷咆哮膜磨损机理

• 批准号: 12650134
• 负责人: HOKKIEIGAWA Kazuo
• 金额: $ 2.5万
• 依托单位: Tohoku University (2001-2002)Yamagata University (2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650134/
• 关键词: Ceramics; Thin film; Wear; Wear mode; Wear mechanism

The first purpose of this study is to clarify the types of microscopic wear modes on the wide range of normal load and sliding velocity and those mechanisms by performing friction test of ceramic coating with CCD microscope tribo-system, which was developed by the representative of this study. The second purpose of this study is to construct the world's first wear map of ceramic coatings by analysis of the generation condition of each wear modes theoretically, in order to clarify the use standard of ceramic coating as a wear resistant frictional element.In this year the reciprocating pin-on-disk friction test between DLC coating and diamond pin was performed. We performed the friction test on the wide range of normal loads and sliding velocities with directly observing the generation process of wear particles with CCD microscope. Consequently we clarify the several type of the microscopic wear modes depend on apparent contact pressure Pa and those mechanisms described as bellow(1) P_a>P_<c2> : Peeling of the coaling film is generated in the first cycle of friction.(2) P_<c1><P_a<P_<c2> : Peeling of the coating film is generated after given cycles of friction.(3) P_a<P_<c1> : Although the peeling of coating film is not generated, wear of coating film itself is generated.(4) There exist two types of coating film's wear modes as described bellow・ Flake formation : Large scale brittle fracture type wear generated by the effects of apparent contact pressure and apparent shear stress.・ Powder formation: Local brittle fracture type wear (mild wear) generated by the effects of real contact pressure and shear stress in the contact interface.

本研究的第一个目的是通过使用本研究代表开发的CCD显微摩擦系统对陶瓷涂层进行摩擦试验，阐明在宽的法向载荷和滑动速度范围内的微观磨损模式的类型及其机理。本研究的第二个目的是从理论上分析各种磨损模式的产生条件，构建世界上第一个陶瓷涂层的磨损图谱，以明确陶瓷涂层作为耐磨摩擦元件的使用标准。在较宽的法向载荷和滑动速度范围内进行了摩擦试验，并用CCD显微镜直接观察磨粒的生成过程。从而阐明了由表观接触压力Pa决定的几种微观磨损模式，其机理为：（1）P_a&gt;P_a<c2>：在第一次摩擦循环中，涂层膜发生剥落。(2)P_<c1>&lt;P_a&lt;P_<c2>：在给定的摩擦循环之后产生涂层膜的剥离。(3)P_a&lt;P_<c1>：虽然不产生涂膜的剥离，但产生涂膜本身的磨损。(4)涂层膜的磨损模式有两种：·剥落形成：在表观接触压力和表观剪切应力的作用下产生的大规模脆性断裂型磨损。·粉末形成：局部脆性断裂型磨损（轻度磨损），由接触界面中的真实的接触压力和剪切应力的作用产生。