The Fretting Wear Property of Grease Containing Antiwear Nanoparticles Additives

2012 ◽  
Vol 562-564 ◽  
pp. 179-183 ◽  
Author(s):  
Jiu Wang ◽  
Bo Shui Chen ◽  
Jian Hua Fang ◽  
Jiang Wu
Keyword(s):  
Wear Behavior ◽  
Protective Layer ◽  
Fretting Wear ◽  
Wear Volume ◽  
Wear Property ◽  
Synergy Effect ◽  
Mechanical Motion ◽  
High Chemical ◽  
Oil Additives ◽  
High Chemical Activity

First the fretting wear behavior of CuS nanoparticles additives in grease were studied. The results show that the fretting wear volume reduce significantly when CuS nanoparticles additives add to grease. At the same time the existence of sulfid nanoparticles can reduce friction coefficient at the latter fretting time. The results of XPS tests show that Cu, Zn, Ni, S and B elements were founded in the film of wear scar. Secondly the effect of antiwear and oiliness additives on fretting wear behavior of nanoparticles additives in Grease were studied. It was found that when some antiwear, oiliness additives (such as T203, T322, stearyl alcohol or stearic acid) and sulfide nanoparticles were added to urea grease, a synergy effect between the two types of additives made fretting wear volume more small than that of either additive. Based on the results of contrast experiment and some analysis of fretting wear scars, we present the idea that two additives react with friction surface step by step. That is to say, the high chemical activity of CuS nanoparticles decompose first and form protective layer, the heat converted from chemical reaction of CuS decomposition and mechanical motion promote composition of common oil additives, thus protective layer is formed once again and wear volume further decrease.

scholarly journals Experimental Studies on Fretting Wear Behavior of PVDF Piezoelectric Thin Films

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 734
Author(s):  
Yuanjie Shu ◽  
Liaoliang Ke ◽  
Jie Su ◽  
Fei Shen
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Applied Voltage ◽  
Polyvinylidene Fluoride ◽  
Normal Force ◽  
Wear Behavior ◽  
Experimental Studies ◽  
Displacement Amplitude ◽  
Fretting Wear ◽  
Wear Volume

This paper discusses an in-depth experimental study on the fretting wear behavior of PVDF (polyvinylidene fluoride) piezoelectric thin film against a Si3N4 ceramic sphere under air conditions. A fretting wear device with a ball-on-plate contact configuration was applied. The changes of displacement amplitude, normal force, and applied voltage were taken into account. The friction logs were used to determine the contact state of the PVDF thin film during the fretting test. The 3D topography instrument and scanning electron microscope (SEM) were used to measure the details of the surface morphology and wear volume. The test results of PVDF thin films under different normal force, displacement amplitude, and applied voltage are summarized through the collection and analysis of experimental data. It is shown that the creep and plastic deformation lead to obvious winkles at the contact surface, which may decrease the specific wear rate of PVDF thin films.

scholarly journals The Effect of Displacement Amplitude on Fretting Wear Behavior and Damage Mechanism of Alloy 690 in Different Gaseous Atmospheres

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5778
Author(s):  
Long Xin ◽  
Lanzheng Kang ◽  
Weiwei Bian ◽  
Mengyang Zhang ◽  
Qinglei Jiang ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Displacement Amplitude ◽  
Fretting Wear ◽  
Partial Slip ◽  
Wear Volume ◽  
Stick Slip ◽  
Slip Regime ◽  
Mixed Regime ◽  
Alloy 690 ◽  
Strong Adhesion

The effect of displacement amplitude on fretting wear behavior and damage mechanisms of alloy 690 in air and nitrogen atmospheres was investigated in detail. The results showed that in air, the friction coefficient gradually increased with the increase in displacement amplitude which conformed to the universal law. In nitrogen, however, it had the highest point at the displacement amplitude of 60 μm due to very strong adhesion. Whether in air or nitrogen, the wear volume gradually increased with the increase in displacement amplitude. The wear volume in air was larger than that in nitrogen except at 30 μm. At 30 μm, the wear volume in air was slightly smaller. With an increase in displacement amplitude, a transformation of fretting running status between partial slip, mixed stick-slip, and final gross slip occurred along with the change of Ft-D curves from linear, to elliptic, to, finally, parallelogrammical. Correspondingly, the fretting regime changed from a partial slip regime to a mixed regime to a gross slip regime. With the increase in displacement amplitude, the transition from partial slip to gross slip in nitrogen was delayed as compared with in air due to the strong adhesion actuated by low oxygen content in a reducing environment. Whether in air or nitrogen, the competitive relation between fretting-induced fatigue and fretting-induced wear was prominent. The cracking velocity was more rapid than the wear. Fretting-induced fatigue dominated at 30 μm in air but at 30–60 μm in nitrogen. Fretting-induced wear won the competition at 45–90 μm in air but at 75–90 μm in nitrogen.

scholarly journals Torsional Fretting Wear Behavior of PVD TiCN Coated CuNiAl Blade Bearing in Oil and Artificial Seawater

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 140 ◽  
Author(s):  
Po Zhang ◽  
Jian Wang
Keyword(s):  
Wear Behavior ◽  
Friction Pair ◽  
Surface Hardness ◽  
Friction Torque ◽  
Artificial Seawater ◽  
Fretting Wear ◽  
Wear Volume ◽  
Wear And Corrosion ◽  
Ticn Coating ◽  
Torsional Fretting

The feasibility of alleviating torsional fretting wear of the blade bearing by preparing PVD TiCN coating was studied. The results show that the friction torque was highly influenced by the wear debris acting as the solid lubricant. The TiCN coating reduced the wear volume by 97.6% and 62.3% in oil and artificial seawater, respectively, which was mainly due to an increase in surface hardness. In oil, the produced sulfates and phosphates prevent seizures between the friction pair and the worn surface was characterized by polishing wear. In artificial seawater, the wear mechanism was a combination of mechanical wear and corrosion wear. This study reveals that the TiCN coating is suitable for alleviation of fretting wear in the blade bearing.

Study on Fretting Wear Behavior of Medium Carbon Steel Used in Steel Worm Gear Pair

2010 ◽  
Vol 34-35 ◽  
pp. 1431-1435
Author(s):  
Zhu Jun Li ◽  
Da Tong Zhang ◽  
Ming Shao
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Medium Carbon Steel ◽  
Worm Gear ◽  
Fretting Wear ◽  
Wear Volume ◽  
Test Frequency ◽  
Test Parameters ◽  
Adhesion Wear

Fretting wear behavior of 40CrNiMoA steel was studied on a SRVⅣoscillating friction and wear tester. The results indicate that the fretting wear volume increase with test frequency, load and amplitude increasing. Meanwhile, the fretting wear mechanism is directly related to test frequency, load and amplitude. When they are small, the main fretting wear mechanism is abrasive wear, with these test parameters increasing, the main fretting wear mechanism turns to a combination of abrasive wear and adhesion wear. Based on the experimental results, the anti-fretting wear measures of steel worm gear pairs used in mechanical tracked regulator of tracked vehicle are discussed.

Study on Fretting Wear Behavior of 40CrNiMoA Steel

2010 ◽  
Vol 139-141 ◽  
pp. 447-451
Author(s):  
Zhu Jun Li
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Experimental Results ◽  
Fretting Wear ◽  
Wear Volume ◽  
Volume Increase ◽  
Test Parameters ◽  
Adhesion Wear

This study deals with fretting wear behavior of 40CrNiMoA steel on a SRVⅣoscillating friction and wear tester. The results indicate that with the frequency and load increasing, both the friction coefficient and fretting wear volume increase. With the amplitude increasing, the fretting wear volume increased too, but the effect of amplitude on friction coefficient was not simple positive correlation according to the experimental results. Meanwhile, the fretting wear mechanism is directly related to test frequency, load and amplitude. When they are small, the main fretting wear mechanism is abrasive wear, with these test parameters increasing, the main fretting wear mechanism turns to a combination of abrasive wear and adhesion wear. Based on the experimental results, the anti-fretting wear measures of steel worm gear pairs used in mechanical tracked regulator of tracked vehicle are discussed.

Experimental Study on Fretting Wear Behavior of Steel Worm Gear Pair

2011 ◽  
Vol 328-330 ◽  
pp. 755-759
Author(s):  
Zhu Jun Li ◽  
Ze Yu Chen ◽  
Xuan Min Chen ◽  
Ying Li
Keyword(s):  
Friction And Wear ◽  
Room Temperature ◽  
Wear Behavior ◽  
Worm Gear ◽  
Test Method ◽  
Fretting Wear ◽  
Wear Volume ◽  
Dry Sliding ◽  
Gear Pair ◽  
Volume Loss

In order to prolong the life of steel worm pair used in track tension adjuster, a test method was designed to evaluate the effect of hardness on the fretting wear behavior of steel worm gear on a SRVⅣoscillating friction and wear tester. Through this method the fretting wear behavior of 40CrNiMoA steel-18Cr2Ni4WA steel with different hardness matching was studied under dry sliding condition at room temperature. The results show that in the steel worm gear pair composed of 40CrNiMoA steel and 18Cr2Ni4WA steel, the fretting wear volume loss of 40CrNiMoA steel decreased and that of the 18Cr2Ni4WA steel worm material increased with the hardness of 40CrNiMoA steel increasing. When the hardness of 40CrNiMoA steel is about HRC49, fretting wear volumes of the worm specimen was equal to that of the worm wheel specimen. Based on the experimental results, reasonable hardness matching for prolonging the life of steel worm pair used in track tension adjuster was proposed.

An investigation of impact-sliding behavior and fretting wear of tubes against different supports in steam generators

2020 ◽  
Vol 72 (10) ◽  
pp. 1295-1301
Author(s):  
Kai Guo ◽  
Zhongli Han ◽  
Yipeng Wang ◽  
Yang Wang ◽  
Wei Tan
Keyword(s):  
Peer Review ◽  
Wear Behavior ◽  
Fretting Wear ◽  
Impact Factors ◽  
Wear Volume ◽  
Steam Generators ◽  
Content Type ◽  
Circular Holes ◽  
Wear Calculation ◽  
Interaction Characteristic

Purpose The purpose of this study is to reveal the interaction behavior between tubes and supports in steam generators and study the fretting wear of tubes in different load conditions. Design/methodology/approach The fretting wear tests were conducted to investigate the fretting wear behavior of the tubes against three kinds of supports: the drilled circular holes (DCH), anti-vibration bars (AVBs) and trefoil orifice holes (TOH), which are widely used supports in nuclear steam generators. In this paper, the comparison of the interaction characteristic with different impact factors was established such as clearances and loads in the three kinds of supports. The fretting wear volume and scars were analyzed by a scanning electron microscope and 3D profiler. Findings The results show that impact can play a more important role in the DCH and TOH supports than that in AVBs. The normal work rate can be underestimated in the DCH and TOH supports. Originality/value The results of this study can be reference of fretting wear calculation in the design of steam generators with different kinds of supports and can be guidance in the maintenance of steam generators. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2019-0513/

scholarly journals Effects of Temperature on the Fretting Wear Behavior of 2.25Cr-1Mo Tubes against Gr5C12 Rods

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3388
Author(s):  
Xu-Dong Chen ◽  
Li-Wen Wang ◽  
Ling-Yun Yang ◽  
Rui Tang ◽  
Zhen-Bing Cai
Keyword(s):  
Elevated Temperatures ◽  
Wear Behavior ◽  
Normal Load ◽  
Engineering Application ◽  
High Hardness ◽  
Fretting Wear ◽  
Wear Volume ◽  
Wear Depth ◽  
Material Transfer ◽  
Effects Of Temperature

In the heat exchangers of sodium-cooled fast reactors, sodium flow can cause the tubes to vibrate, resulting in fretting wear damage due to the contact between the tubes (2.25Cr-1Mo steel) and their support plate (Gr5C12 alloy). In this work, the effects of temperature on the fretting wear behavior of a 2.25Cr-1Mo heat transfer tube on a Gr5C12 alloy rod were studied. The results showed that the coefficient of friction (COF) and wear volume increased first and then decreased with the increase in temperature. Moreover, 2.25Cr-1Mo showed great wear performance at high temperatures than at room temperature and 80 °C, because of the antifriction nature of the oxidative layer and the high hardness of the tribological transformed structure layer. As the temperature increased, material transfer and plastic deformation became increasingly obvious, but average wear depth decreased. This provides data support for the practical engineering application of 2.25Cr-1Mo steel at elevated temperatures. Wear mechanisms were found to depend modestly on temperature and largely on normal load. As temperature increases, the wear mechanism gradually changes from abrasive wear to adhesive wear.

Fretting Wear Behavior of Burnished Pure Copper under Oil Lubrication

2012 ◽  
Vol 591-593 ◽  
pp. 1108-1112 ◽  
Author(s):  
Ning Li ◽  
Jing Zhao ◽  
Wei Xia ◽  
Feng Lei Li
Keyword(s):  
Friction Coefficient ◽  
Wear Behavior ◽  
Pure Copper ◽  
Fretting Wear ◽  
Coarse Grained ◽  
Wear Volume ◽  
Wear Properties ◽  
Fatigue Wear ◽  
Corrosion Properties ◽  
Increasing Load

Burnishing is an important mechanical surface enhancement technique which can smooth the component surface and improve the component’s fatigue, wear and anti-corrosion properties. Fretting tests lubricated with mineral oil were performed on a pure copper (PC) against a Si3N4 ball. The burnished surface exhibited a significantly improved fretting wear resistance and higher friction coefficient in comparison with the coarse-grained (CG) form. The wear volume of the burnished PC is quite lower than that of the CG PC. The friction coefficient of the CG PC increases with an increasing load, while the friction coefficient of burnished PC decreases with an increasing load up to 100N and then increases. The enhanced wear properties of the burnished surface are correlated with the compressive residual stress and work-hardening, which may partly result from grain refinement induced by burnishing.

Effects of Nb Content and Heat Treatment on Fretting Wear Behavior of Ti-Nb Alloys

2021 ◽  
Vol 1016 ◽  
pp. 1846-1850
Author(s):  
Naoki Nishimura ◽  
Eri Miura-Fujiwara ◽  
Tohru Yamasaki
Keyword(s):  
Corrosion Potential ◽  
Wear Behavior ◽  
Open Circuit ◽  
Potential Difference ◽  
Fretting Wear ◽  
Wear Volume ◽  
Test Machine ◽  
Heat Treated ◽  
Nb Content ◽  
The Relationship

Ti-Nb alloys in deionized water and Hanks' balanced salt solution were investigated at 310K using a ball-on-disc type frictional test machine with a ZrO2 ball counterface. In this study, besides the fretting wear behavior of Ti-Nb alloys was investigated, the relationship between the microstructure and mechanical properties of the Nb-added Ti alloy was investigated, and the relationship between the composition and hardness on the fretting wear of the alloy will be clarified from the results of the wear volume and surface analysis of wear track. The results obtained from the frictional test indicate that the dynamic coefficient of friction converged to a constant value with time variation. Also, wear volume in HBSS was smaller than in water, and wear volume of heat-treated became smaller than As-Rolled. Microstructural observations suggest the scars of adhesive wear were observed. Comparing each morphology, the ratio of the peeling part was more significant in Ti-Nb alloys, which have α+β than in Ti-Nb alloys, which have only β. Moreover, the results of Open circuit potentiometry indicate that the corrosion potential difference increased with wear. This is most likely due to the passive film was damaged. Besides, the corrosion potential difference of β-Ti-Nb alloy heat-treated with HBSS is small. It is assumed that there is an influence of HBSS besides the fine structure.

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