Steel Tribopair Research Articles

Effect of Ag Content in Palygorskite/Ag Blending Nanocomposite on Friction and Wear Properties of 45 Mild Steel Tribopair

The in situ mechanochemical auto-restoration technology of tribosurfaces has become a subject of great interest in recent years. This paper reports a study of the effect of Ag content in palygorskite (P)/Ag nanocomposites on friction-reducing and anti-wear properties of 45 mild steel tribopair. The electron microprobe has been used in its surfaces topography and elemental analysis. The study shows the auto-restoration layers formed on the tribopairs can decrease the wear mass loss and friction coefficient of these samples remarkably; when the Ag content in P/Ag was properly increased, it can help to decrease the friction coefficient of the tribopair samples.

Experimental investigation of dynamic friction at high contact pressure applied to an aluminium/stainless steel tribo pair

The paper describes a new dynamic friction experiment developed in order to provide data for direct code and model comparison. A plane shock wave generated by plate impact is applied to a specific target made up of two parts: a central cone surrounded by a confinement material. The geometry of the target ensures the contact at the interface. Free surface velocity measurement of the central cone allows us to indirectly determine the dynamic friction coefficient between the constituent materials of the target. This is calculated by comparing experimental and numerical simulation test results. Various contact pressure and sliding velocity are achievable by changing the nature of the flyer and the impact speed or the angle of the cone. Plate impact experiments with different impact velocities were conducted to investigate dry sliding characteristics of Al 5083 on AISI 321 stainless steel at high contact pressure, up to 10 GPa, and high sliding velocity, up to 400 m/s. Experimental results are presented and compared with calculations involving a modified Coulomb friction law.