Experimental research on tribological characteristics of TiAlN coated valve plate in electro-hydrostatic actuator pumps

Zhao, Jingcheng; Fu, Yongling; Wang, Mingkang; Fu, Jian; Chao, Qun; Wang, Shaopeng; Deng, Ming

doi:10.1016/j.triboint.2020.106782

Cited by 19 publications

(14 citation statements)

References 13 publications

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“…Details about this experimental method followed the literature. 35 The hydraulic schematic diagram of the test rig is shown in Figure 3. The integrated cylinder shaft is driven by a spindle motor, with rotational speed ranging from 300 to 18,000 rpm.…”

Section: Experimental Device Considering Flow Fieldmentioning

confidence: 99%

“…By using a 3D measuring laser microscope, the wear depths and surface topography of each specimen is observed and evaluated. 35 The test rig of friction and wear is emplaced in a constant temperature laboratory, equipped with an oil cooler to maintain the oil temperature at 30°C. A dedicated temperature rise test is designed to reduce the impact of the temperature rise.…”

Section: Test Proceduresmentioning

confidence: 99%

“…Those tin bronze particles been torn off fill in the grooves on TiAlN coating surface and smoothen the surface. 35 Therefore, the tin bronze/TiAlN matching material has relatively low friction. For the W9Mo3Cr4V/ TiAlN matching material, abrasive wear and fatigue wear occur on the W9Mo3Cr4V surface.…”

Section: Friction Coefficient Analysismentioning

confidence: 99%

“…When the pump is loaded with high pressure and rotates at high speed, the oil film fails to maintain its integrity, thus resulting in semi-dry friction or even bad dry friction between the sliding surfaces. Therefore, researchers are committed to 35 optimizing the oil film performance of the cylinder block/valve plate interface, mainly including promoting the bearing capacity of the oil film and reducing the wear resistance of the interface. 26 To promote the bearing capacity of the cylinder block/valve plate interface, researchers have proposed structural and surface shaping optimal methods based on hydrodynamic or micro motion effects, including hydrodynamic bearing pads, 27 waved microstructures, 28 surface textures, 29 and floating valve plates.…”

Section: Introductionmentioning

confidence: 99%

“…However, their experimental apparatus was not designed for simulating the wide working condition of the EHA pump. To make a connection with the wide working condition existing in the actual EHA pump, Zhao et al 35 built an EHA high-speed and high-pressure piston pump test rig and established the friction and wear test apparatus for the EHA pump cylinder block/valve plate interface. Then, under the actual wide working condition, the valve plate coated with TiAlN cermet was tested.…”

Section: Introductionmentioning

confidence: 99%

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Tribological characteristics of hard-to-hard matching materials of cylinder block/valve plate interface in electro-hydrostatic actuator pumps

Fu,

Lyu,

Kang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Axial piston pumps, serving as the essential power component in electro-hydrostatic actuators (EHA), play a crucial role in achieving advanced actuation by ensuring high efficiency and reliability. The cylinder block/valve plate interface, which is the greatest contact area inside the axial piston pump, significantly affects both leakage and energy dissipation. The interface experiences significant friction loss and severe wear in aerospace applications, primarily due to the rapidly changing mixed and boundary lubrication conditions under a wide range of speed and pressure. Therefore, to improve the efficiency and reliability of electro-hydrostatic actuators, strengthening the cylinder block/valve plate interface is a key problem to overcome. Previous studies have demonstrated that the utilization of soft-to-hard matching materials enhances the friction characteristics of the interface, but it also results in relatively severe wear on the soft material. Therefore, in this study, we propose the concept of employing hard-to-hard matching materials as a strategy to mitigate wear in axial piston pumps. An optimized friction simulation test apparatus is adopted, which contains a simulated piston structure to take the piston stirring effect into consideration. Experimental results show that the implementation of hard-to-hard materials leads to a substantial improvement in the wear resistance of the interface under a wide range of rotational speed (300–6000 rpm). The wear depths of the TiAlN/TiAlN (hard-to-hard) matching material are only 28.6%~34.7% of the tin bronze/TiAlN (soft-to-hard) matching material. Besides, compared with traditional tin bronze/nitrided (soft-to-hard) matching material, the hard-to-hard matching materials improve both friction and wear performance. The hard-to-hard matching materials provide a novel approach to reinforce the cylinder block/valve plate interface, and thus to promote volumetric efficiency and extend the service life of the axial piston pump.

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Section: Experimental Device Considering Flow Fieldmentioning

confidence: 99%

Section: Test Proceduresmentioning

confidence: 99%

Section: Friction Coefficient Analysismentioning

confidence: 99%