scholarly journals The Effect of Honing Angle and Roughness Height on the Tribological Performance of CuNiCr Iron Liner

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 487 ◽  
Author(s):  
Ma ◽  
Liu ◽  
Wang ◽  
Wang ◽  
Huang ◽  
...  
Keyword(s):  
Smooth Surface ◽  
Friction And Wear ◽  
Piston Ring ◽  
Friction Pair ◽  
Tribological Performance ◽  
Roughness Height ◽  
Roughness Parameters ◽  
Slight Effect ◽  
Wear Process ◽  
Worn Surface

This work investigated the effect of honing morphologies of CuNiCr iron liner on its tribological properties sliding against the Cr-Al2O3 coated piston ring. The worn surface morphology and elements distribution as well as the wear behaviors of CuNiCr iron liner were analyzed to explore the influencing of the honing angle and roughness height on the friction and wear resistance. The results show that the optimized honing angle and roughness can improve the tribological performance of the iron liner, and different tribological characteristics are closely related to different roughness parameters. The wear process of the CuNiCr iron liner against Cr-Al2O3 coated piston rings in sequence was platform flattening, plastic flow, growth of the flakes on the platform edge and flakes debonding. For the smooth surface, the plastic deformed flakes were much fewer due to the low height of the platforms, thus the grooves were not fully filled and there was a slight effect of the debonded debris on the friction pair.

scholarly journals Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites

2017 ◽  
Vol 24 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Iskender Ozsoy ◽  
Adullah Mimaroglu ◽  
Huseyin Unal
Keyword(s):  
Fly Ash ◽  
Friction And Wear ◽  
Filler Content ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Atmospheric Conditions ◽  
Wear Rates ◽  
Pin On Disc ◽  
Worn Surface

AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Influence of positive texturing on friction and wear properties of piston ring-cylinder liner tribo pair under lubricated conditions

2019 ◽  
Vol 71 (4) ◽  
pp. 515-524 ◽  
Author(s):  
Venkateswara Babu P. ◽  
Ismail Syed ◽  
Satish Ben Beera
Keyword(s):  
Wear Resistance ◽  
Internal Combustion Engine ◽  
Friction And Wear ◽  
Piston Ring ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Tribological Performance ◽  
Friction Reduction ◽  
Content Type

Purpose In an internal combustion engine, piston ring-cylinder liner tribo pair is one among the most critical rubbing pairs. Most of the energy produced by an internal combustion engine is dissipated as frictional losses of which major portion is contributed by the piston ring-cylinder liner tribo pair. Hence, proper design of tribological parameters of piston ring-cylinder liner pair is essential and can effectively reduce the friction and wear, thereby improving the tribological performance of the engine. This paper aims to use surface texturing, an effective and feasible method, to improve the tribological performance of piston ring-cylinder liner tribo pair. Design/methodology/approach In this paper, influence of positive texturing (protruding) on friction reduction and wear resistance of piston ring surfaces was studied. The square-shaped positive textures were fabricated on piston ring surface by chemical etching method, and the experiments were conducted with textured piston ring surfaces against un-textured cylinder liner surface on pin-on-disc apparatus by continuous supply of lubricant at the inlet of contact zone. The parameters varied in this study are area density and normal load at a constant sliding speed. A comparison was made between the tribological properties of textured and un-textured piston ring surfaces. Findings From the experimental results, the tribological performance of the textured piston ring-cylinder liner tribo pair was significantly improved over a un-textured tribo pair. A maximum friction reduction of 67.6 per cent and wear resistance of 81.6 per cent were observed with textured ring surfaces as compared to un-textured ring surfaces. Originality/value This experimental study is helpful for better understanding of the potency of positive texturing on friction reduction and wear resistance of piston ring-cylinder liner tribo pair under lubricated sliding conditions.

Influence of Nano-Serpentine on Tribological Behaviors and Wear Process of Hybrid PTFE/Kevlar Fabric Composites

2011 ◽  
Vol 418-420 ◽  
pp. 455-459 ◽  
Author(s):  
Ling Lu ◽  
Yu Lin Yang ◽  
Xiao Wen Qi ◽  
Zong Xiang Hou
Keyword(s):  
Laser Scanning ◽  
Friction And Wear ◽  
Confocal Laser Scanning Microscope ◽  
Transfer Film ◽  
Confocal Laser ◽  
Wear Process ◽  
Tribological Behaviors ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Worn Surface

Tribological behaviors and wear process of the unfilled and 2% nano-serpentine filled polymer-based hybrid PTFE/Kevlar fabric composites were evaluated on a MMU-5G friction and wear tester. The variation of the morphologies of the worn surface and the morphologies of transfer film during the wear processes of the two composites were observed and analyzed by means of the confocal laser scanning microscope (CLSM). The results show that the addition of nano-serpentine can effectively slow down the wear process and obviously improve the wear resistance of the hybrid PTFE/Kevlar fabric composite, meanwhile the friction property was ameliorative. That probably because the nano-serpentine does not only have the admirable tribological performance, but also have excellent surface activity, which improved the formation of the self-lubricating transfer film.

Experimental Research of Scuffing of Friction Pair

2014 ◽  
Vol 697 ◽  
pp. 254-257
Author(s):  
Jie Lin Xu ◽  
Zeng Xiong Peng ◽  
Nan Wang ◽  
Shan Lin Xu
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
High Speed ◽  
Friction And Wear ◽  
Friction Pair ◽  
Common Phenomenon ◽  
Working Pressure ◽  
Wear Characteristics ◽  
Worn Surface ◽  
Friction And Wear Characteristics

The scuffing of friction pair is a common phenomenon in conditions of high speed and pressure. It was researched on scuffing characteristics in this paper. By using UMT-3 friction and wear tester, the friction and wear characteristics of slipper pair material in hydraulic component were investigated, and the friction coeficient-speed curves in the different pressures were got, as well as the wear rate-speed curves. The worn surface morphology of pin specimen was photographed by SEM, and the formation mechanism of the worn surface was analyzed. The results suggested that: friction coefficient and wear rate would have a jump when the scuffing occurred, the friction and wear characteristics would be affected by the interaction of pressure (P) and speed (V) . The PV characteristic restricted the correlation between working pressure and speed.

High Temperature Tribological Performance of Steel/Copper Friction Pairs Lubricated With a Modified C-WS2-(Fe3O4+TiN) Nanoadditives in Non-Copper Coated Solid Wires

2021 ◽  
Author(s):  
Hong Li ◽  
Jing Zhu ◽  
Yu Zhang ◽  
Zhuoxin Li ◽  
Bo Meng
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Tribological Performance ◽  
Wear Volume ◽  
Test Results ◽  
Nanoparticle Concentration ◽  
Tribological Test ◽  
Average Coefficient ◽  
Worn Surface

Abstract In this study, four kinds of nanoparticles: graphite, WS2, Fe3O4 and TiN were used as lubricating additives for steel/copper friction pairs to solve the problem of welding contact tube wear with non-copper-coated solid wire at high temperature. The single and composite nanoparticles have excellent dispersion stability in absolute ethanol under the action of the compound surfactant NaSTA+OA+PVP. The tribological test results showed that the maximum decrement with reference to the average coefficient of friction and wear volumes were measured with nanoparticle concentration in 1:1:1 ratio at 300℃. Compared with dry friction, the average friction coefficient and wear volume are reduced by 74.3% and 84.8%, respectively, which may be attributed to the formation of a stable tribo-film mainly composed of C-O, Fe2O3, WO3, TiO2, TiNxOy composite on the worn surface. Therefore, it is considered that the combined lubrication effects of the ball-bearing effect, repairing of worn surfaces and the tribo-film resulted in the lowest friction and wear.

Performance Evaluation of Piston Compression Ring Through Accelerated Wear in Engine Tests

2012 ◽  
Author(s):  
Nicholas Morris ◽  
Homer Rahnejat ◽  
Ramin Rahmani ◽  
Paul King ◽  
Brian Fitzsimons
Keyword(s):  
Mechanical Property ◽  
Piston Ring ◽  
Tribological Performance ◽  
Engine Test ◽  
Average Flow ◽  
Wear Process ◽  
Fundamental Knowledge ◽  
Compression Ring ◽  
Method Of Solution ◽  
Cylinder Bore

Both the piston ring and cylinder bore experience wear throughout their life cycle. Therefore change occurs in the geometrical profile and topography of the ring. In addition, coating on the ring is also subject to wear, thus altering the physical/mechanical property of the contacting surface. These changes affect the tribological performance of the ring-bore conjunction. Geometrical changes often alter the ring contacting profile, which affects the entrainment of the lubricant into the conjunction. This can affect the regime of lubrication, thus mechanisms that contribute to friction. Wear of surfaces also plays some role in boundary friction in terms of topographical changes as well as surface properties such as hardness and asperity shear strength. Most analysis does not take into account changes in tribological conditions which occur as the result of these salient changes in practice. The paper intends to bridge this gap in the fundamental knowledge and provide explanations for some in-field experiences noted with wear of a compression ring in a typical engine test. The method of solution used is based on the average flow factors which are indicative of entrainment of the lubricant through the rough ring-bore conjunction. This approach was initiated by Patir and Cheng, for which realistic topographical parameters according to the stage of the wear process is included. Changes in friction and fuel energy consumed are predicted.

Characterisation of abrasive worn surfaces by surface microtopography parameters

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
I. Barányi ◽  
G. Kalácska ◽  
Patrick De Baets
Keyword(s):  
Surface Roughness ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Dual Role ◽  
Roughness Parameters ◽  
Wear Process ◽  
Functional Parameters ◽  
Surface Microtopography ◽  
Before And After ◽  
Roughness Measurements

Surface microtopography plays a dual role in the course of friction and wear processes. It affects the contact and temperature conditions, and it undergoes significant changes in accordance with the wear mechanism. The amplitude, spacing, hybrid and functional parameters of microtopographies provide opportunities for understanding more deeply the wear process. Wear experiments and surface roughness measurements before and after the wear were performed. The aim of this study was to define the availability of the roughness parameters to describe the microtopography modification during the abrasive tribological process.

Effects of frictional heat on the tribological properties of Ni3Al matrix self-lubricating composite containing graphene nanoplatelets under different loads

2017 ◽  
Vol 232 (6) ◽  
pp. 645-656 ◽  
Author(s):  
Yuchun Huang ◽  
Xiaoliang Shi ◽  
Kang Yang ◽  
Xiyao Liu ◽  
Zhihai Wang
Keyword(s):  
Working Conditions ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Tribological Behavior ◽  
Tribological Performance ◽  
Graphene Nanoplatelets ◽  
Frictional Heat ◽  
Worn Surface ◽  
Al Matrix ◽  
Better Than

In order to analyze the effects of frictional heat on the tribological performance of Ni3Al matrix self-lubricating composite containing 6.2 vol.% graphene nanoplatelets (NB), the dry sliding friction tests of Ni3Al-based alloy and NB against GCr15 steel ball are undertaken under different loads from 3 to 18 N. The effects of different amount of frictional heat on the friction and wear mechanism of NB are also studied. The results show that tribological performance of NB is better than that of Ni3Al-based alloy under same working conditions. The addition of graphene nanoplatelets promotes the formation of stable glaze layer on worn surface. In addition, graphene nanoplatelets enhance the thermal conductivity of NB, which makes the surface temperature of wear scar of NB in a proper range (about 413 ℃) at 13 N and avoids the serious friction and wear caused by the accumulation of frictional heat. At 13 N, NB shows the lower friction coefficient (0.32) and wear rate (3.6 × 10−5 mm3·N−1·m−1). It is attributed to the appropriate local temperature (about 413 ℃) of worn surface, resulting in the formation of stable glaze layer with good friction reducing and wear resistance on worn surface. This study was meaningful for optimizing applied loads to realize the appropriate frictional heat and good tribological behavior of NB.

scholarly journals Tribological performance of nano-diamond composites-dispersed lubricants on commercial cylinder liner mating with CrN piston ring

2020 ◽  
Vol 9 (1) ◽  
pp. 455-464
Author(s):  
Ruoxuan Huang ◽  
Zichun Wang ◽  
Xiaoshuai Yuan ◽  
Tianchi Zhang ◽  
Siqi Ma ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Friction And Wear ◽  
Piston Ring ◽  
Negative Impact ◽  
Friction Pair ◽  
Cylinder Liner ◽  
Lubricating Oil ◽  
Wear Loss ◽  
Base Oil ◽  
Cylinder Liners

AbstractThis work investigated the effect of nanodiamond (ND) additives on the tribological properties of CrN-coated piston ring mating with the chromium-plated and BP alloy iron cylinder liners, which is one of the key friction pairs in the internal combustion engines. To enhance the dispersion of the NDs in the base oil, the surface of ND particles was modified with polyaniline via in situ polymerization. The friction and wear as well as the scuffing characteristics of the friction pair lubricated with different contents of ND composite-added base oil were evaluated by using the reciprocating tribotests, which are close to the actual conditions. The wear surface morphologies and elements distribution were analyzed to explore the wear behaviors and the associated mechanisms of friction pairs under the lubrication incorporated with the ND composites. The results show that the ND additive is beneficial for the pair of Cr liner and CrN-coated piston ring in the friction and wear as well as scuffing properties, and the best concentration of ND additive is expected to be around 1 wt%. But for the BP liner, the developed nanocomposite has a negative impact. The friction force and the wear loss of the pair lubricated by the ND composite-added oil are even worse than that tested with the base lubricating oil.

Investigation of the Tribological Characteristics of ZCuPb20Sn5 and No.45 Steel under Emulsion Lubrication

2011 ◽  
Vol 338 ◽  
pp. 603-606
Author(s):  
Zhen Hui Luan ◽  
Ming Ding ◽  
Xiang Fei Wu
Keyword(s):  
Electron Microscope ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Scanning Electron Microscope ◽  
Friction And Wear ◽  
Friction Pair ◽  
Tribological Characteristics ◽  
Oil Lubrication ◽  
Worn Surface ◽  
Scanning Electron

As friction pair, ZCuPb20Sn5 and No.45 steel are most in use in gear motor under oil lubrication. In order to investigate the tribological characteristics of ZCuPb20Sn5 and No.45 steel under emulsion lubrication, the authers tested them on MMW-1 friction and wear tester with sample pin and thrust ring. The relationships between the friction coefficient and the load, the friction coefficient and the speed, the wear rate and the load, the wear rate and the speed were provided. The worn surface of ZCuPb20Sn5 were investigated by means of scanning electron microscope. The results showed that, alone with the raising of the load and the speed, the wear rate of ZCuPb20Sn5 increased, but the friction coefficient reduced.

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