Fei Gao

TL;DR: In this paper, the authors investigated the tribological properties of copper-based friction materials with exogenous copper powder third body and found that the friction coefficient can be average increased by 0.03 by the presence of exogenous powder on the friction surface compared with the non-exogenous copper based friction materials.

TL;DR: In this paper, a tribological behavior of copper-graphite powder third body on copper-based friction materials was investigated by adding different percentage copper and graphite mixed powder into the friction surface during dry sliding.

Abstract: In this paper, the influence of graphite (Gr) on the dry sliding tribological properties of phenolic resin (PF) composites was studied under different sliding speeds of 3.1–47.1 m/s. The wear mechanism was investigated by the observation of the morphology of the transfer layer during the dry sliding process. It was found that the addition of Gr could decrease the friction coefficient and wear rate effectively, and the friction coefficient and wear rate decreased with the increase of Gr content in the range of 10–30 vol.%. The dominant wear mechanisms of PF-based friction composites changed from adhesive wear to fatigue wear (in the form of peeling-off) in the high sliding speed condition after the addition of Gr. The addition of Gr effectively reduced the sensitivity of PF-based friction materials to sliding speeds, and thus enhanced the stability of the friction coefficient. When the content of Gr was above 20 vol.%, the stability of the friction coefficient was relatively steady.

TL;DR: In this article, a well-established metal forming method, the continuous extrusion forming (CONFORM) process, was employed as a severe plastic deformation route to refine the microstructure of Mg alloys.

TL;DR: In this article, the influence of the degree of morphological variances of third body on the friction coefficient is investigated using a pin-on-disc tribometer by a method of interface interference caused by various grit size abrasive papers by grinding the friction surface during friction.