This study investigates tribological performance of MoS2 coating on slipper pair in axial piston pump.Firstly,the MoS2 coating on the surface of slipper pair was prepared by atmospheric plasma spraying treatment techn...This study investigates tribological performance of MoS2 coating on slipper pair in axial piston pump.Firstly,the MoS2 coating on the surface of slipper pair was prepared by atmospheric plasma spraying treatment technology.Secondly,the tribological characteristics of slipper pair under various working conditions were evaluated on ring-on-block tester in oil lubrication.The original and worn surfaces of the specimens were analyzed with scanning electron microscope and energy dispersive spectrometer,and then the wear morphologies of the MoS2 coatings were imaged by X-ray photoelectron spectroscopy.The experimental results showed that the friction coefficients of Cu-based materials with MoS2 coating decreased by about 0.05 at 800 N.Especially,when the external load was set to 800 N,the wear rate of the ZY331608 decreased by about 16.4%after the substrates were treated by the MoS2 coating,which exhibited excellent anti-friction and wear resistance.The formation of the MoS2 lubricating film could be classified into four stages,including the initial friction stage,anchoring stage of MoS2 on friction surface,covering stage of the sliding surface by MoS2 and the formation stage of MoS2 film.The dominating wear mechanisms of Cu-based materials with MoS2 coating were adhesive wear and abrasive wear accompanied with oxidative wear.展开更多
Hydrostatic slipper was often used in friction bearing design, allowing improvement of the latter's dynamic behavior. The influence of thermal effect on hydrostatic slipper bearing capacity of axial piston pump wa...Hydrostatic slipper was often used in friction bearing design, allowing improvement of the latter's dynamic behavior. The influence of thermal effect on hydrostatic slipper bearing capacity of axial piston pump was investigated. A set of lumped parameter mathematical models were developed based on energy conservation law of slipper/ swash plate pair. The results show that thermal equilibrium clearance due to solid thermal deformation periodically changes with shaft rotational angle. The slipper bearing capacity increases dramatically with decreasing thermal equilibrium clearance. In order to improve the slipper bearing capacity, length-to-diameter ratio of fixed damper varies from 3.5 to 8.75 and radius ratio of slipper varies from 1.5 to 2.0. In addition, the higher slipper thermal conductivity is useful to improve slipper bearing capability, but the thermal equilibrium clearance is not compromised.展开更多
基金Project(51805376)supported by the National Natural Science Foundation of ChinaProject(LQ17E050003)supported by the Zhejiang Provincial Natural Science Foundation of China+1 种基金Project(GZKF-201719)supported by the Open Foundation of the State Key Laboratory of Fluid Power and Mechatronic Systems,ChinaProject(G20180019)supported by the Basic Scientific Research Projects Foundation of Wenzhou,China。
文摘This study investigates tribological performance of MoS2 coating on slipper pair in axial piston pump.Firstly,the MoS2 coating on the surface of slipper pair was prepared by atmospheric plasma spraying treatment technology.Secondly,the tribological characteristics of slipper pair under various working conditions were evaluated on ring-on-block tester in oil lubrication.The original and worn surfaces of the specimens were analyzed with scanning electron microscope and energy dispersive spectrometer,and then the wear morphologies of the MoS2 coatings were imaged by X-ray photoelectron spectroscopy.The experimental results showed that the friction coefficients of Cu-based materials with MoS2 coating decreased by about 0.05 at 800 N.Especially,when the external load was set to 800 N,the wear rate of the ZY331608 decreased by about 16.4%after the substrates were treated by the MoS2 coating,which exhibited excellent anti-friction and wear resistance.The formation of the MoS2 lubricating film could be classified into four stages,including the initial friction stage,anchoring stage of MoS2 on friction surface,covering stage of the sliding surface by MoS2 and the formation stage of MoS2 film.The dominating wear mechanisms of Cu-based materials with MoS2 coating were adhesive wear and abrasive wear accompanied with oxidative wear.
基金Projects(51475332,51275356)supported by the National Natural Science Foundation of China
文摘Hydrostatic slipper was often used in friction bearing design, allowing improvement of the latter's dynamic behavior. The influence of thermal effect on hydrostatic slipper bearing capacity of axial piston pump was investigated. A set of lumped parameter mathematical models were developed based on energy conservation law of slipper/ swash plate pair. The results show that thermal equilibrium clearance due to solid thermal deformation periodically changes with shaft rotational angle. The slipper bearing capacity increases dramatically with decreasing thermal equilibrium clearance. In order to improve the slipper bearing capacity, length-to-diameter ratio of fixed damper varies from 3.5 to 8.75 and radius ratio of slipper varies from 1.5 to 2.0. In addition, the higher slipper thermal conductivity is useful to improve slipper bearing capability, but the thermal equilibrium clearance is not compromised.
