Synergistic Effects of Ultrasonic Rolling Textures and PTFE‐PPS/SiO₂ Coatings on Dry Friction and Wear Properties of GCr15 Steel Surfaces

Ultrasonic surface rolling processing (USRP) is used to fabricate textures with different shapes and processing times on the surface of GCr15 substrates. The polytetrafluoroethylene‐polyphenylene sulfide/silicon dioxide (PTFE‐PPS/SiO₂) lubricant coating is subsequently deposited on texture surfaces by electrohydrodynamic atomization. USRP texturing not only forms the texture shapes but also realizes the strengthening effects of increased hardness and residual stress. Synergistic effects of the PTFE‐PPS/SiO₂ coating and different USRP textures on dry friction and wear properties are investigated. The results show that the synergistic effect of the linear texture with two processing times and the PTFE‐PPS/SiO₂ coating achieves better dry friction and wear performance than the individual effect. The texture shape and the processing times both affect the synergistic effect. The increase in processing times has a positive effect on synergistic improvement. The linear texture plays a better synergistic effect compared with that of the wavy texture with the same processing times. The USRP textures affect the tribological properties of texture‐coating samples by mainly influencing the coating‐substrate adhesion. The texture with an appropriate shape and height can improve the adhesion with the coating, and thus synergistically improve the dry friction and wear properties of the substrate.