Characterization and evolution of the coefficient of friction during pin on disc tribotest: Comparison between C10200 Cu, AA6082-T6 Al and C36000 brass pins under varying normal loads

Anodizing of AA6082-T5 by conventional and innovative treatments: Microstructural characterization and dry sliding behaviour

“…Representative coefficient friction (COF) values recorded as a function of sliding distance under a normal load of 5 N are shown in Figure 6 for both the untreated AA6082 alloy and the anodised surfaces. In the steady-state regime, untreated AA6082 slides against 100Cr6 steel with a COF of about 0.4, lower than for treated samples and consistent with literature data [25][26][27][28]. Moreover, dynamic COF data of the AA6082/steel couple displayed large oscillations, due to stick-slip phenomena [29].…”

“…COFs of ECO and PEO are not significantly influenced by applied load, differently from HA and untreated AA6082. The COF of AA6082 slightly increased with normal load, probably due to the abrasive action of fragments detaching from iron oxide transfer layers [25]. At low normal load, HA shows average COF values similar to ECO, but at 20 N the COF started to increase, probably due to more extensive micro-cracking that forms large abrasive fragments, as previously discussed.…”

Effects of ball milling and load on transfer film formation of copper-based composites

“…As for the material milled for 10 h, there is a transfer film with a high degree of coverage and large thickness. The firm attaching of transfer film can effectively prevent direct contact between the friction pairs, thereby obtaining greater friction performance (Ferreira et al , 2019). As the BM time further increases to 20 h, the transfer film is less continuous.…”

“…Some studies have indicated that the ball milling (BM) technology can greatly enhance the interface bonding strength between the matrix and the second phase (Liu et al , 2022; Yazdani and Isfahani, 2018; Zhang et al , 2019). However, there are few studies so far about how BM technology affects transfer film on counterface during wear process, which is of great importance to the tribological properties of Cu-based composites (Ferreira et al , 2019; Mao et al , 2020). This work systematically explores how BM affects the friction transfer of Cu-based composites with BM time as a variable and investigates the correlation between transfer film and tribological properties under different loads, which may guide the preparation of Cu-based composites with excellent tribological properties.…”

Capillary electroosmosis properties of water lubricants with different electroosmotic additives under a steel-on-steel sliding interface

“…Moreover, it can bring more oxygen molecules into the contact area to form an anti-wear layer, thus achieving a better tribological performance [16]. However, when the load is further increased, the excessive pressure between the friction pairs may cause the anti-wear layer formed on the worn surface to peel off quickly [50], increasing the wear of the friction pairs, as reflected by the larger values of COF.…”