| Summary: | 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 Cr<sub>3</sub>C<sub>2</sub>-NiCr, WC-10Co-4Cr, Cr<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>-13%TiO<sub>2</sub> 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 Cr<sub>3</sub>C<sub>2</sub>-NiCr coating could be damaged under high rotational speed. Due to the reaction film produced by the Al<sub>2</sub>O<sub>3</sub>-13%TiO<sub>2</sub> and water, the CF-PEEK/Al<sub>2</sub>O<sub>3</sub>-13%TiO<sub>2</sub> material combination exhibits more excellent tribological behaviors than other tribopairs lubricated with water, and could preferentially be used in water hydraulic piston pumps.
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