scholarly journals Tribological Properties of ZrO2 Coating on the Ball Joint of an Axial Piston Pump in High Water-Based Emulsion Medium

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Baofu Kou ◽  
Zhenshun Li ◽  
Zhang Zhang ◽  
Ruiqing Li
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
High Water ◽  
Wear Loss ◽  
Ball Joint ◽  
Zro2 Coating ◽  
Ceramic Ball ◽  
Water Based ◽  
Axial Piston ◽  
Emulsion Concentration

This paper studies the tribological properties of the ZrO2-coated spherical joint pair of the axial piston pump in a high water-based emulsion medium. Firstly, atmospheric plasma spraying was used to prepare the ZrO2 coating on the surface of the spherical joint pair. Secondly, the tribological characteristics of the steel-steel pair and ceramic-ceramic pair were analyzed by the friction and wear testing machine under the conditions of a high water-based emulsion concentration, load size, and load frequency. White light interference three-dimensional surface profiler and scanning electron microscope were used to analyze the original and worn surfaces of the samples, and then the friction and wear of the different material pairs were discussed. The results show that the friction reduction and wear resistance of the ceramic ball joint are superior to those of the steel ball joint. When the load is 100 N, the frequency is 1 Hz, and the emulsion concentration is 5%, and the friction coefficient and wear loss of the ceramic-ceramic ball joint pair are the lowest. The emulsion concentration and load have great influence on the friction coefficient and wear amount, while the frequency has little influence on them. With increasing concentration of the emulsion, the friction coefficient decreases and tends to be stable, but with increasing of load, the friction coefficient and wear increase. The friction coefficient and wear loss of the ceramic-ceramic ball joint in pure water are 0.25 times higher than those of the steel ball joint under the same working conditions. Therefore, when the concentration of the high water-based emulsion is 5%, 100 N load, 1 Hz frequency, the ceramic-ceramic ball joints display the best friction and wear resistance of the two. The research results provide a theoretical basis for the design, manufacture, and application of the ceramic coating hydraulic components in a high water-based emulsion medium.

Experimental Research on Wear Loss of Slipper Pair in Axial Piston Hydraulic Motor Lubricated with High Water Based Fluid

2012 ◽  
Vol 452-453 ◽  
pp. 119-123
Author(s):  
Yong Xia Gu ◽  
Zhong Ning Zhou ◽  
Fei Gao
Keyword(s):  
Experimental Research ◽  
High Water ◽  
Experimental Results ◽  
Wear Volume ◽  
Wear Loss ◽  
Hydraulic Motor ◽  
Water Based ◽  
Wear And Tear ◽  
Axial Piston

The slipper pairs with concaves of reasonable and unreasonable structures and without concave originally are chosen for the experiment. The experimental results show that appropriate concave distribution can improve the wear and tear condition of the slipper bottom. Under the same experimental condition, the fringe wear volume can be reduced by 28.77%, and the overall wear volume 68.72%, which is the best result.

Tribological behavior of UHMWPE in water lubrication: the effect of molding temperature

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xincong Zhou ◽  
Chaozhen Yang ◽  
Jian Huang ◽  
Xueshen Liu ◽  
Da Zhong ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Wear Loss ◽  
Content Type ◽  
Molding Temperature ◽  
Melting Temperatures ◽  
Ultra High Molecular Weight ◽  
Wear Tests ◽  
Friction And Wear Tests

Purpose Ultra-high molecular weight polyethylene (UHMWPE) is adopted in water-lubricated bearings for its excellent performance. This paper aims to investigate the tribological properties of UHMWPE with a molecular weight of 10.2 million (g mol‐1) under different molding temperatures. Design/methodology/approach The UHMWPE samples were prepared by mold pressing under constant pressure and different molding temperatures (140°C, 160°C, 180°C, 200°C, 220°C). The friction and wear tests in water were conducted at the RTEC tribo-tester. Findings The friction coefficient and wear loss decreased first and rose later with the increasing molding temperature. The minimums of the friction coefficient and wear loss were found at the molding temperatures of 200°C. At low melting temperatures, the UHMWPE molecular chains could not unwrap thoroughly, leading to greater abrasive wear. On the other hand, high melting temperatures will cause the UHMWPE molecular chains to break up and decompose. The optimal molding temperatures for UHMWPE were found to be 200°C. Originality/value Findings are of great significance for the design of water-lubricated UHMWPE bearings.

Study on Friction and Wear Properties of Self-Lubricating Impregnated Diamond Bit Cutters

2011 ◽  
Vol 175 ◽  
pp. 136-139 ◽  
Author(s):  
Bing Suo Pan ◽  
Xiao Hong Fang ◽  
Ming Yuan Niu
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Matrix Material ◽  
Wear Loss ◽  
Wear Properties ◽  
Wear Process ◽  
Impregnated Diamond Bit ◽  
Pin On Disc ◽  
Friction And Wear Properties ◽  
Diamond Bit

To reduce the friction coefficient between impregnated diamond bit and rock, experiments on addition of graphite to the matrix material of bit cutters were conducted. The cutters were made up of diamond contained working layers and binding layers. The friction and wear properties of cutters and binding layers were investigated using a pin-on-disc friction & wear tester with granite as tribopair. The results showed that with addition of graphite, the hardness and friction coefficient of binding layer decreased, but its wear resistance increased; compared to cutters without graphite, those cutters containing graphite had lower wear loss and friction coefficient and their sliding wear process was much steadier, but diamond protrusion was still normal.

Effect of Wettability on Tribological Properties of Porous UHMWPE

2012 ◽  
Vol 549 ◽  
pp. 670-673
Author(s):  
Gang Wu ◽  
Shuang Kun Chen ◽  
Hong Ling Qin ◽  
Chun Hua Zhao
Keyword(s):  
Contact Angle ◽  
Friction Coefficient ◽  
Porous Layer ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Loss ◽  
Hot Press ◽  
Different Characteristics ◽  
Press Molding

Porous UHMWPE with different characteristics are prepared by hot press molding in Metallographic Sample Mounting. Friction and wear loss of porous UHMWPE samples are studied under different loads and lubricant on an improved tribological tester. The friction coefficient and wear loss of samples with porosity of 5.44% are lower than that of samples with porosity of 10.17%. Thickness of porous layer has little effect on the tribological properties of porous UHMWPE. Contact angle remarkable decreases with increasing porosity of UHMWPE samples. The change of wettability is the primary cause of the improving tribological properties of porous UHMWPE.

Wear Testing of Principal Friction Pairs in Axial Piston Pump Based on Taguchi Design Method

2015 ◽  
Vol 779 ◽  
pp. 26-34 ◽  
Author(s):  
Cun Ran Zhao ◽  
Ji Hai Jiang ◽  
Chong Ke
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Design Method ◽  
Friction Pair ◽  
Piston Pump ◽  
Wear Testing ◽  
Wear Loss ◽  
Axial Piston Pump ◽  
Axial Piston ◽  
Selection Of

While axial piston pump is the core component of hydraulic system, its service life and reliability depend much on the selection of materials, friction pairs and process parameters. To identify these factors, wear condition of friction pair is conducted by using MWF-10 wear rig. Based on ANOVA of Taguchi Method,the influences of surface roughness and hardness on wear loss and friction coefficient are compared. In addition, the results show that the optimal friction pair and surface roughness of hard specimens have influence mostly on the wear loss and the friction coefficient.

scholarly journals A Piston-Swiveling-Cylinder Pair in a High Water-Based Hydraulic Motor with Self-Balanced Distribution Valves

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3175 ◽  
Author(s):  
Jiyun Zhao ◽  
Bingjing Qiu ◽  
Jiaxiang Man
Keyword(s):  
Friction Coefficient ◽  
Fluid Structure Interaction ◽  
High Water ◽  
Hydraulic Motor ◽  
Working Pressure ◽  
Structure Interaction ◽  
Water Based ◽  
Balanced Distribution ◽  
Working Performance ◽  
The Difference

To improve the low viscosity and poor lubrication characteristics of high-water-based hydraulic liquid, the abrasion and leakage problems in hydraulic components need to be addressed. In a high water-based hydraulic motor with self-balanced distribution valve (HWBHM-SDV), there are two key friction pairs: the piston-crankshaft pair and piston-swivelling-cylinder (PSC) pair. To study the working performance of the PSC pair in HWBHM-SDV, we firstly designed the structural parameters. We found that, within the working speed 0–100 rpm, the leakage in the PSC pair is mainly caused by pressure-gradient flow, and the influence of the seal will not be significant when the seal length is 24 mm. Then, the friction coefficients of different matching materials were tested. It was found that the friction coefficient of 316L stainless steel with OVINO-GIC (OVINO-graphite intercalated compound) coating (316L-GIC)/PEEK reinforced with 30% carbon fibre (PEEK-30CF) is about 0.02~0.04, and the friction coefficient of 316L-GIC/316L-GIC is about 0.05–0.07. Finally, the influences of factors (clearance, temperature, pressure, and material) on leakage performance were analysed based on an orthogonal test method considering fluid-structure interaction. It was found that clearance has the most significant influence on leakage, followed by pressure and liquid temperature, and the difference between matching materials 316L-GIC/316L-GIC and 316L-GIC/PEEK-30CF is insignificant when the clearance is less than 8 μm and the working pressure is less than 10 MPa. Moreover, the difference in volume efficiency loss between theoretical analysis and calculated result considering fluid-structure interaction increases with the increase of working pressure and working speed. To ensure good working performance of a PSC pair, matching materials 316L-GIC/PEEK-30CF could be selected for pressures below 15 MPa, while 316L-GIC/316L-GIC could be used at 28 MPa.

A Comparative Study on the Tribological Behavior of SAE-AISI 1055 Steel and Brass (CuZn39Pb2) a Pin on Disc Type of Contact

2019 ◽  
Vol 397 ◽  
pp. 147-160
Author(s):  
Bougoffa Mohammed Seyf Eddine ◽  
Mebrouki Noura
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Test Bench ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Normal Load ◽  
Wear Loss ◽  
Initial Surface ◽  
Sliding Speed ◽  
Friction And Wear Behavior

The paper assesses and compares the friction and wear behavior of SAE-AISI 1055 steel and brass (CuZn39Pb2) under dry sliding condition. The tribological behavior was investigated and compared by conducting two different experiments, the first experiment conducted on a CSM tribometer, and the second experiment was carried out on a test bench in horizontal lathe machine where device holder pin is fabricated and mounted on a test bench and a rotating disc, varying the normal load exert on the disc by the pin and the rotation speed of the disc. These tests consisted of measuring friction coefficient and wear loss of samples. Experiments are carried out in normal load 5-10 N, sliding speed 0.24-0.35 and 0.48 m/s. Variations of coefficient of friction during sliding at different initial surface roughness, normal load and sliding speed are investigated. Results show that the two alloys had different friction and wear behavior, for steel friction coefficient increase slowly with the increase of normal load and sliding speed. For brass friction coefficient decreases with the increase of normal load and sliding speed. On the other hand, it is also found that wear loss increase with sliding distance. Microscopic of worn surfaces for each alloy were carried out and compared.

Effect of Acrylamide Modified Liner on Properties of Self-Lubricating Spherical Plain Bearings

2014 ◽  
Vol 668-669 ◽  
pp. 306-309
Author(s):  
Ming Qiu ◽  
Ren Song Hu ◽  
Ying Chun Li ◽  
Zhuo Pei Yang ◽  
Chuang Chuang Duan
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Loss ◽  
Wear Properties ◽  
Bonding Properties ◽  
Friction Temperature ◽  
Spherical Plain Bearing ◽  
Correlational Dependence

The effects of acrylamide modified liner on bonding properties and tribological properties of self-lubricating spherical plain bearings were explored by used of Instron5944 electronic universal testing machine and homemade spherical plain bearings friction and wear tester. The results showed that the bonding properties of bearings modified by acrylamide modified liner were much more improved than those of the unmodified bearings; Self-lubricating spherical plain bearing friction and wear properties and oscillating frequency obvious correlational dependence. With the increase of the oscillation frequency, the friction coefficient and the wear loss increased, while the friction temperature rose. The friction coefficient, wear loss and friction temperature of bearings modified were much more improved than those of the unmodified bearings. It showed that the liners after modification treatment can improve the tribological properties of self-lubricating spherical plain bearings.

The Influence of Porous Structure on Tribological Properties of Porous UHMWPE

2012 ◽  
Vol 482-484 ◽  
pp. 954-957
Author(s):  
Gang Wu ◽  
Shuang Kun Chen ◽  
Hong Ling Qin ◽  
Chun Hua Zhao
Keyword(s):  
Friction Coefficient ◽  
Porous Structure ◽  
Porous Layer ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Loss ◽  
Hot Press ◽  
Press Molding

Porous UHMWPE with different character were prepared by hot press molding in Metallographic Sample Mounting. Friction and wear loss of porous UHMWPE samples were studied under different loads and lubricant on an improved tribological tester. The friction coefficient and wear loss of samples with porosity of 5.44% are lower than that of samples with porosity of 10.17%, which attribute to the better porous structure and extrusion effect of lubricant in testing. Among the increasing of loads, friction and wear loss of porous samples are enhance rapidly. It is also found that the thickness of porous layer has little effect on the tribological properties of porous UHMWPE.

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