Purpose

This study aims to investigate the effect of MoS2 powder on tribological properties of sliding interfaces.

Design/methodology/approach

Loose MoS2 powder was introduced in the gap of point-contact friction pairs, and sliding friction test was conducted using a testing machine. Friction noise, wear mark appearance, microstructure and wear debris were characterized with a noise tester, white-light interferometer, scanning electron microscope and ferrograph, respectively. Numerical simulation was also performed to analyze the influence of MoS2 powder on tribological properties of the sliding interface.

Findings

MoS2 powder remarkably improved the lubrication performance of the sliding interface, whose friction coefficient and wear rate were reduced by one-fifth of the interface values without powder. The addition of MoS2 powder also reduced stress, plastic deformation and friction temperature in the wear mark. The sliding interface with MoS2 powder demonstrated lower friction noise and roughness compared with the interface without powder lubrication. The adherence of MoS2 powder onto the friction interface formed a friction film, which induced the wear mechanism of the sliding interface to change from serious cutting and adhesive wear to delamination and slight cutting wear under the action of normal and shear forces.

Originality/value

Tribological characteristics of the interface with MoS2 powder lubrication were clarified. This work provides a theoretical basis for solid-powder lubrication and reference for its application in engineering.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0150/

中文翻译：

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二硫化钼粉末润滑界面的摩擦学特性

目的

本研究旨在研究二硫化钼粉末对滑动界面摩擦学性能的影响。

设计/方法/方法

在点接触摩擦副的间隙中引入松散的二硫化钼粉末，在试验机上进行滑动摩擦试验。摩擦噪声、磨痕外观、微观结构和磨屑分别用噪声测试仪、白光干涉仪、扫描电子显微镜和铁谱仪进行表征。还进行了数值模拟以分析二硫化钼粉末对滑动界面摩擦学性能的影响。

发现

MoS2粉末显着改善了滑动界面的润滑性能，其摩擦系数和磨损率降低了无粉末界面值​​的五分之一。MoS2 粉末的加入还降低了磨损痕处的应力、塑性变形和摩擦温度。与没有粉末润滑的界面相比，具有二硫化钼粉末的滑动界面表现出更低的摩擦噪音和粗糙度。MoS2粉末粘附在摩擦界面上形成了摩擦膜，导致滑动界面的磨损机制在法向力和剪切力的作用下，由严重的切割和粘附磨损转变为分层和轻微的切割磨损。

原创性/价值

阐明了与 MoS2 粉末润滑界面的摩擦学特性。该工作为固体粉末润滑提供了理论依据，为其在工程中的应用提供了参考。

同行评审

本文的同行评审历史可从以下网址获得：https://publons.com/publon/10.1108/ILT-04-2020-0150/