Significant enhancement of tribological properties of microcapsule/epoxy composites in the presence of high loads by incorporating PTFE
Although microcapsules can remarkably diminish the friction coefficient and wear rate of the composites, most of the superior tribological properties are achieved under small contact areas and low loads. To enhance the tribological performance of microcapsule-containing composites at large contact areas and high loads, the PTFE is introduced to construct PTFE/microcapsule/epoxy composites. The resulted composites maintain a low coefficient of friction (COF) of 0.057 and a wear rate of 1.45✕10 −7 mm 3 /Nm against PH13–8Mo Steel in ring-on-ring test configuration at 1500 N (12.7 MPa), where the microcapsule/epoxy composite fails to ensure constant and adequate lubrication . The effect of the PTFE content on the mechanical and tribological properties has been methodically examined and discussed in some detail. The analysis results provide evidence that the island-like transfer film associated with the PTFE is essential for the intense enhancement of tribological properties, in which composition is confirmed by exhaustive analysis. The transfer film tends to lessen the solid friction resulting from the direct contact of asperities in mixing or boundary lubrication while the reducing lubricant film failure is essentially caused by high flash temperature. Additionally, the oleophobic properties of the PTFE promote oil lubrication under a limited oil supply. This work aims to extend service conditions and promote applications of microcapsule/epoxy composites in mechanical components.
危险品化学品经营许可证（带存储）