Research On Surface Wettability And Frictional Characteristics Of Seawater Axial Piston Pump Textured Flow Distributor

In recent years,seawater axial piston pumps have been widely used as the core power components of seawater hydraulic systems.As the key friction pair of seawater axial piston pumps,the distribution pair has a significant impact on its operation.Due to the poor environment in which the distribution pair operates,it is prone to corrosion,wear,and failure.In order to improve the friction and wear performance of the distribution pair,scholars at home and abroad have conducted extensive research.This paper applies surface texturing technology to the surface design of the distribution pair,and analyzes the mechanism of the effect of textured surfaces on wettability using theoretical analysis and experimental research.The friction and wear characteristics are also studied to improve the lubrication ability,friction and wear performance,and service life of the distribution pair.The research results can be used to optimize the performance of the distribution pair.This paper takes the distribution pair of seawater axial piston pumps as the research object,and selects SAF2507 super duplex stainless steel and CF/PEEK(carbon fiber reinforced polyetheretherketone)as the paired materials.Different parameter textured pits are machined on the surface of the materials.The theoretical contact angle of the textured pits is calculated using the classical wetting model,and the contact angle data of different textured surfaces are obtained through contact angle experiments.The factors influencing the wettability of the textured surface are analyzed in detail,and the mechanism is analyzed using the classical wetting theory.Specimens are machined on the cylinder liner of the SAF2507 material,and on the distribution disc of the CF/PEEK material.Different parameter textured pits are machined on the upper specimen surface,which is paired with a smooth surface lower specimen.The friction and wear test of the textured cylinder liner distribution pair is carried out using the MMD-5A friction and wear test machine to obtain friction coefficient,wear amount,and surface morphology data.The friction and wear characteristics of the textured cylinder liner are studied,and the relationship between wettability and friction and wear is analyzed in combination with the change in contact angle.Based on the experimental results of the textured cylinder liner distribution pair,optimized textured pits are machined on the lower specimen surface,which is paired with a smooth surface upper specimen.The friction and wear test of the textured distribution disc distribution pair is carried out on the friction and wear test machine under actual working conditions to obtain friction coefficient data.The friction and wear characteristics of the textured distribution disc are studied,and the relationship between wettability and friction and wear is analyzed and explained.