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Tong WU, Yuan GAO, Wei WANG, Kuaishe WANG. Preparation and High Temperature Tribological Properties of Core-Shell MoS2@SiO2 Nanocomposites[J]. Acta Materiae Compositae Sinica.
Citation: Tong WU, Yuan GAO, Wei WANG, Kuaishe WANG. Preparation and High Temperature Tribological Properties of Core-Shell MoS2@SiO2 Nanocomposites[J]. Acta Materiae Compositae Sinica.

Preparation and High Temperature Tribological Properties of Core-Shell MoS2@SiO2 Nanocomposites

Funds:  National Natural Science Foundation of China (52005386) and The Scientific and Technological Innovation Team Project of Shaanxi Innovation Capability Support Plan, China (2022TD-30)
  • Received Date: 2022-11-17
  • Accepted Date: 2022-12-21
  • Rev Recd Date: 2022-12-16
  • Available Online: 2023-01-10
  • Molybdenum disulfide (MoS2) is easy to be oxidized when used at high temperature, which leads to significant deterioration of its tribological properties, showing a high friction coefficient. In order to improve the tribological properties of MoS2 lubricant under high temperature environment, core-shell MoS2@SiO2 Nanocomposites was formed by hydrothermal method and improved Stöber method. The morphology, size and composition of the nano materials were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The micro results show that the core-shell structure composite was successfully prepared, with an average particle size of 250 nm. The high temperature friction test of prepared MoS2@SiO2 solid lubrication coating was carried out, and the MoS2 coating was used as a comparison. The morphology and structure of the coating were characterized by SEM and XRD, and the wear rate of the coating was characterized by a 3D profiler. The results show that the friction coefficient of the MoS2@SiO2 coating at 680℃ was 0.2 and relatively stable, while MoS2 coating rapidly failed. The MoS2@SiO2 coating had better wear resistance, with a wear rate 25.86% lower than that of MoS2 coating. After the friction tests, MoS2 still exists in the wear scar area of the MoS2@SiO2 coating, which was covered by the lubricating film; However, the substrate in the wear zone of MoS2 coating was completely exposed. The results show that the coating of SiO2 shell delayed the rapid oxidation of MoS2 at high temperature, and the synergistic lubricating extend the service life of the coating.

     

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