Abstract
Current studies of a seawater axial piston pump mainly solve the problems of corrosion and wear in a slipper pair by selecting materials with corrosion resistance, self-lubrication, and wear resistance. In addition, an appropriate biomimetic non-smooth surface design for the slipper pair can further improve the tribological behavior. In this paper, 316L stainless steel and CF/PEEK were selected to process the upper and bottom specimens, and the biomimetic non-smooth surface was introduced into the interface between the friction pair. The friction and wear tests were performed on a MMD-5A tester at a rotation speed of 1000 r/min and load of 200 N under seawater lubricated condition. The results indicate that the main friction form of the smooth surface friction pair corresponds to abrasive wear and adhesive wear and that it exhibits a friction coefficient of 0.05–0.07, a specimen temperature of 56 °C, a high wear rate, and surface roughness. Pits on the non-smooth surface friction pairs produced hydrodynamic lubrication and reduced abrasive wear, and thus the plowing effect is their main friction form. The non-smooth surface friction pairs exhibit a friction coefficient of 0.03–0.04, a specimen temperature of 48 °C, a low wear rate, and surface roughness. The study has important theoretical significance for enriching the lubrication, friction, and wear theory of a seawater axial piston pump, and economic significance and military significance for promoting the marine development and the national defense military.
Highlights
1 Introduction Various advantages of seawater including cleanliness, safety, and convenience promote the development of seawater hydraulic transmission system
Eng. (2019) 32:66 drag reduction, and wear resistance of the biomimetic non-smooth surface that is extremely important for the practical application of seawater axial piston pump and other seawater hydraulic components
2.1 Materials and Specimens The upper specimen is composed of 316L stainless steel, which is a cost-effective metal material in water hydraulic industry due to its excellent plasticity, toughness, and corrosion resistance
Summary
Various advantages of seawater including cleanliness, safety, and convenience promote the development of seawater hydraulic transmission system. Extant research stagnated in the following three decades and subsequently gained momentum in 1996 when Etsion’s group published a study on surface texturing [11] They used the incompressible two-dimensional Reynolds equation in conjunction with the Half-Sommerfeld cavitation boundary condition to mathematically investigate mechanical seals with hemispherical dimples on mating surfaces. They produced a few seals with micro-dimples by using laser surface texturing (LST) for tests and indicated that each micro-dimple serves either as a micro-hydrodynamic bearing in cases with full or mixed lubrication, a micro-reservoir for a lubricant in cases of starved lubrication, or a micro-trap for wear debris in either lubricated or dry sliding [12, 13]. Friction and wear tests under seawater lubricated condition are performed, the parameters of friction coefficient, specimen temperature, wear rate, and worn surface morphology of the friction pairs with biomimetic non-smooth surface are analyzed, and the friction and wear mechanism are investigated
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