Tribological properties and wear mechanism of Ag@Ti3C2Tx phosphate coatings from room temperature to 800 °C

MXene, a novel two-dimensional layered material, finds extensive applications in solid lubrication. However, its practical use is limited by lubrication failures at high temperatures. To increase the service temperature of Ti3C2Tx solid lubricants, phosphate lubricating coatings were prepared using Ag@Ti3C2Tx as solid lubricants, which exhibits superior tribological properties. Compared with Ti3C2Tx phosphate coating, the friction coefficient and wear rate of Ag@Ti3C2Tx phosphate coating significantly decrease between 400 °C and 800 °C. Especially at 800 ℃, the friction coefficient of Ag@Ti3C2Tx phosphate coating reaches 0.09, and the wear rate shows extremely low. This study lays the foundation for the application of Ti3C2Tx in the field of solid lubricants across a wide temperature range.