Effect of surface texturing on friction reduction between ceramic and steel materials under lubricated sliding contact

FZG Gear Efficiency and Pin-on-Disc Frictional Study of Sintered and Wrought Steel Gear Materials

“…There are some differences between the size of the porosities of the AQ gear tooth and pin with the porosities in [10][11][12], but the sizes are not that different. Wakuda [10] recommended a dimple size of approximately 100 lm under the tested friction conditions. Pettersson [11] showed that the 5-and 20-lm grooved textures and the surface with 5-lm depressions exhibited good frictional properties for all 200,000 cycles.…”

“…The low gear mesh torque loss and friction coefficient of RS-AQ combination are mainly due to the porosities on the surfaces of the AQ parts, which act as oil reservoirs to supply enough lubricant to lubricate the contact surfaces. References [10][11][12] show that controlled dimples on contact surfaces act as lubricant reservoirs and play a role in promoting better lubrication and a decrease in friction. By calculation, the size (average value of length and width) of pores in the AQ pin and gear tooth is between 30 and 40 lm.…”

“…The surface textures in Wakuda [10] and Kovalchenko [12] are in the form of circular dimples with [11], there are two different surface textures: the first is in the form of grooves 5, 20 and 50 lm wide, and the second one is grids with the same length and widths of 5, 20 and 50 lm. There are some differences between the size of the porosities of the AQ gear tooth and pin with the porosities in [10][11][12], but the sizes are not that different. Wakuda [10] recommended a dimple size of approximately 100 lm under the tested friction conditions.…”

“…One of the presumed effects of surface texturing under boundary lubrication conditions is that micro-dimples may act as fluid reservoirs and play a role in promoting the retention of a lubricating film. By using pinon-disc tests, Wakuda [10] verified the effect of microdimples on the frictional properties of a silicon nitride ceramic on hardened steel and successfully reduced the friction coefficient from 0.12 to 0.10 under lubricated conditions. Using reciprocating sliding of a ball-bearing steel against textured diamond-like carbon (DLC) surfaces, Pettersson [11] showed that under boundary lubrication conditions, some textured DLC surfaces exhibited excellent performance.…”

The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact

“…The positive impacts of the micro-dents were demonstrated. Wakuda et al [33] studied the influences of the dimple size, density, and shape on the friction behavior of a contact formed by the textured ceramic disk and the non-textured steel pin under the contact pressure of 0.78GPa and the sliding speed ranging from 0.012 to 1.2 m/s. The results showed the effects of the dimple size and density on the friction reduction were similar to those under the low loading condition [23][24][25]29].…”