The Ti2AlNb‐based self‐lubricating composite material reinforced with silver particles of 0 wt% to 15 wt% was prepared by spark plasma sintering, and the microhardness, compression performance and high‐temperature tribological properties were investigated. The results show that the silver is distributed in the Ti2AlNb matrix as small islands. The microhardness reaches the maximum at 5 wt% silver content but then decreases sharply. The compressive strength is reduced due to the silver‐rich areas have become the initiation points of cracks, and the softening of silver at high temperatures intensifies the process. The friction coefficient and wear rate of the composite material at 500 °C are significantly reduced by silver, and the lubrication mechanism is attributed to the synergistic effect of silver and oxides.

Molybdenum disulfide (MoS2) is widely used in the field of lubrication due to its unique layered structure. But in a high temperature environment, MoS2 can be greatly deteriorated by severe oxidation, showing a higher friction coefficient and a shorter service life. The modified Stöber method was used to coat SiO2 on the surface of MoS2, so that MoS2 was converted into layered α-MoO3 in a confined space at high temperature. The morphology, size and composition of the prepared α-MoO3@SiO2 core-shell nanoparticles were investigated using transmission electron microscopy, scanning electron microscopy, x-ray diffraction and Raman spectroscopy. The tribological properties of the prepared nanoparticles were investigated by ball-disk friction experiments. The results show that the prepared nanoparticles have uniform particle size, high shell coverage and excellent anti-wear properties. Based on the analysis of the wear scars and the existing elements on the friction surface, the lubrication mechanism of the core-shell structure in the friction experiment was discussed.