Investigation of the Elevated Temperature Tribological Property and Wear Mechanism of Fe–15Cu–0.8C Materials Containing Mo‐Coated MoS₂Powders

Abstract

In this work, MoS2 solid lubricant was introduced in the form of Mo‐coated MoS2 powder, to enhance the antifriction properties of sintered ferrous antifriction materials (FAMs). The microstructure, phase composition, and tribological properties of Fe‐15Cu‐0.8C‐3.75 (Mo‐coated MoS2) (MC1) were investigated and compared with Fe‐15Cu‐0.8C (M0) samples, with a discussion on the wear mechanism at a wide temperature range of room temperature (RT) to 600 °C. The study revealed that the addition of Mo‐coated MoS2 powders effectively prevents the decomposition of MoS2 during sintering, enhances the bonding strength between MoS2 and the substrate, and significantly improves the hardness of the sintered Fe‐15Cu‐0.8C samples. In comparison to the sintered Fe‐15Cu‐0.8C samples, the sintered Fe‐15Cu‐0.8C‐3.75(Mo‐coated MoS2) samples exhibit good antifriction properties with a frictional coefficient of 0.23 at 600 °C and a wear rate of 6.3 × 10‐7 mm3/N·mm at 300 °C. Introducing Mo‐coated MoS2 significantly reduces the average friction coefficient and wear rate of the sintered FAMs at elevated temperatures, attributed to the formation of FeMoO4. The antifriction performance of MC1 samples notably decreases with increasing test temperatures. The main wear mechanism is oxidative wear above 300°C.This article is protected by copyright. All rights reserved.