Tribological Performance of CF‐PEEK Sliding Against 17‐4PH Stainless Steel with Various Cermet Coatings for Water Hydraulic Piston Pump Application

Abstract

To improve the abrasion resistance performance of the critical tribopairs within water hydraulic piston pumps, tribological characteristics of the stainless steel 17‐4PH and 17‐4PH coated with Cr3C2‐NiCr, WC‐10Co‐4Cr, Cr2O3 and Al2O3‐13%TiO2 sliding against carbon fiber reinforced polyetheretherketone (CF‐PEEK) composite under water‐lubricated condition were experimentally studied using a pin‐on‐ring test bench with different working conditions. It has been demonstrated by the experimental results that the tribological behaviors of CF‐PEEK/cermet coatings tribipairs were better than that of CF‐PEEK/17‐4PH tribopair under water lubrication. However, the Cr3C2‐NiCr coating could be damaged under high rotational speed. Due to the reaction film produced by the Al2O3‐13%TiO2 and water, the CF‐PEEK/Al2O3‐13%TiO2 material combination exhibits more excellent tribological behaviors than other tribopairs lubricated with water, and could preferentially be used in water hydraulic piston pumps.