scholarly journals Effects of Dispersant and ZDDP Additives on Fretting Wear

2020 ◽  
Vol 69 (1) ◽  
Author(s):  
A. Kontou ◽  
R. I. Taylor ◽  
H. A. Spikes
Keyword(s):  
Bearing Steel ◽  
Fretting Wear ◽  
Significant Protection ◽  
Surface Characterisation ◽  
Stroke Length ◽  
Base Oil ◽  
Wear And Friction ◽  
Dry Conditions ◽  
Wear Damage ◽  
Fretting Damage

AbstractThis paper examines the effect of dispersant and anti-wear additives on fretting wear in lubricated bearing steel contacts. Reciprocating sliding ball-on-flat fretting tests with a stroke length of 50 μm have been carried out on steel-to-steel contacts in both dry and lubricated conditions. Wear and friction coefficient have been measured, and surface characterisation has been carried out using optical techniques to investigate fretting wear. The presence of base oil reduces fretting wear markedly compared to dry conditions, but fretting damage is still observed at low reciprocation frequencies. As frequency is increased, there is a transition from oxidative to adhesive/scuffing damage. The anti-wear additive ZDDP is effective in forming a tribofilm on the surfaces and reducing visible oxidation and wear. A succinimide dispersant also reduces the accumulation of solid debris but does not alleviate wear damage. The combination of both ZDDP anti-wear additive and dispersant in base oil appears to provide significant protection against fretting wear.

scholarly journals Literature Review on Fretting Wear and Contact Mechanics of Tribological Coatings

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 501 ◽  
Author(s):  
Lifeng Ma ◽  
Kilho Eom ◽  
Jean Geringer ◽  
Tea-Sung Jun ◽  
Kyungmok Kim
Keyword(s):  
Literature Review ◽  
Contact Mechanics ◽  
Relative Displacement ◽  
Fretting Wear ◽  
Tribological Coatings ◽  
Review Study ◽  
Stress States ◽  
Wear Damage ◽  
Industrial Solutions ◽  
Fretting Damage

This article reviews fretting wear damage in industries and in the contact mechanics of coated systems. Micro-slip motion resulting in fretting damage is discussed along with major experimental factors. The experimental factors, including normal force, relative displacement, frequency and medium influence are directly compared. Industrial solutions to reduce fretting damages are then discussed. The contact mechanics of a coated system are reviewed to quantify stress states in a coating layer and the substrate. Finally, a literature review on simulation for fretting is carried out. This review study provides useful methods and practical solutions to minimize fretting wear damage.

Comparative study on the fretting wear property of 7075 aluminum alloys under lubricated and dry conditions

Wear ◽  
2021 ◽  
pp. 203760
Author(s):  
Po Zhang ◽  
Liangcai Zeng ◽  
Xue Mi ◽  
Yan Lu ◽  
Shiyuan Luo ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Comparative Study ◽  
Fretting Wear ◽  
Wear Property ◽  
Dry Conditions

Assessment of Fretting‐Wear Damage in Nuclear and Process Equipment

2021 ◽  
pp. 373-395
Author(s):  
Michel J. Pettigrew ◽  
Metin Yetisir ◽  
Nigel J. Fisher ◽  
Bruce A. W. Smith ◽  
Victor P. Janzen
Keyword(s):  
Fretting Wear ◽  
Process Equipment ◽  
Wear Damage

scholarly journals Fretting Wear of a Bearing Steel in Hydrogen Gas Environment Containing a Trace of Water

2011 ◽  
Vol 6 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Naoshi Izumi ◽  
Takehiro Morita ◽  
Joichi Sugimura
Keyword(s):  
Bearing Steel ◽  
Hydrogen Gas ◽  
Fretting Wear ◽  
Gas Environment

Fretting wear damage of HexTOOL™composite depending on the different fibre orientations

2009 ◽  
Vol 5 ◽  
pp. 012019
Author(s):  
S Terekhina ◽  
M Salvia ◽  
S Fouvry ◽  
G Malysheva ◽  
T Tarasova
Keyword(s):  
Fretting Wear ◽  
Wear Damage

Friction and Wear Performances of Magnesium Alloy against Steel under Lubrication of Rapeseed Oil with N-Containing Additive

2012 ◽  
Vol 562-564 ◽  
pp. 350-354
Author(s):  
Jian Hua Fang ◽  
Jiu Wang ◽  
Jiang Wu ◽  
Bo Shui Chen ◽  
Ling Dong
Keyword(s):  
Magnesium Alloy ◽  
Rapeseed Oil ◽  
Friction And Wear ◽  
Chemical Species ◽  
Bearing Steel ◽  
X Ray ◽  
Lubrication Film ◽  
Gcr15 Bearing Steel ◽  
Strong Adsorption ◽  
Wear And Friction

A N-containing additive, amide type modified rapeseed oil (named as NRO), was prepared by chemical modification of rapeseed oil and characterized by infrared spectrum The friction and wear performances of AZ91D magnesium alloy against GCr15 bearing steel under the lubrication of rapeseed oil formulated with NRO were evaluated on a SRV tribotester. The topographies and the chemical species of the worn surfaces of magnesium alloy were analyzed by a scanning electron microscope (SEM) and an X-ray photoelectron spectroscope (XPS), respectively. The results indicated that the friction and wear of the magnesium alloy—steel tribomates could be effectively reduced by formulating NRO into rapeseed oil lubricant. The friction coefficients and the wear volumes of magnesium alloy decreased with increasing contents of NRO. The surface lubricated with NRO-doped rapeseed oil was characterized by less wear as compared with that lubricated with neat rapeseed oil. The enhanced anti-wear and friction-reducing abilities of rapeseed oil by NRO in the lubrication of magnesium alloy against steel were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of NRO and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with magnesium alloy.

scholarly journals Micro-Pitting and Wear Assessment of PAO vs Mineral-Based Engine Oil Operating under Mixed Lubrication Conditions: Effects of Lambda, Roughness Lay and Sliding Direction

Lubricants ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 42 ◽  
Author(s):  
Aleks Vrček ◽  
Tobias Hultqvist ◽  
Yannick Baubet ◽  
Marcus Björling ◽  
Pär Marklund ◽  
...  
Keyword(s):  
Bearing Steel ◽  
Mixed Lubrication ◽  
Operating Conditions ◽  
Engine Oil ◽  
Engine Oils ◽  
Rolling Contacts ◽  
Steel Surfaces ◽  
Wear Damage ◽  
Lubrication Conditions ◽  
Ball On Disc

Under certain operating conditions, rolling contacts have been shown to experience some challenges when lubricated with engine oils containing zinc dialkyldithophosphate (ZDDP) anti-wear additive. In order to better understand the main damage mechanisms during various operating conditions, further studies are needed. This article studies micro-pitting and wear damages of bearing steel surfaces under mixed lubrication conditions in a ball-on-disc setup, lubricated with different engine oils. Based on the results, micro-pitting and wear damage is shown to be highly case-dependent. In general, PAO-based engine oil tends to eliminate micro-pitting damage compared to mineral-based engine oil at less severe lubricating conditions. Moreover, a critical lambda was found for both oils, where the highest micro-pitting damage was observed.

Tribological Investigation of Nanographite Platelets as Additive in Anti-Wear Lubricant: A Top-Down Approach

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Flavio A. C. Vidal ◽  
Antonio F. Ávila
Keyword(s):  
Friction Coefficient ◽  
Friction Reduction ◽  
Wear Properties ◽  
Top Down ◽  
Base Oil ◽  
Graphene Layers ◽  
Sliding Mechanism ◽  
Wear And Friction ◽  
Different Types ◽  
Mineral Base

A top-down approach is employed to investigate the tribological effect of adding nanographite platelets (NGPs) to mineral base oil (MBO). The performance of the NGP-modified MBO was evaluated by examining the friction and anti-wear properties. Four different types of NGPs produced by two different processes were employed. The optimal NGP-modified MBO attained a significant wear and friction reduction when compared with the MBO without NGPs. The process used to exfoliate the graphite nanoplatelet samples provided better wear properties because of the graphene layers' smoother sliding mechanism. Graphene layers seeped inside the groove marks to keep the friction coefficient low.

A study on the fretting wear characteristic of SCM415 alloy steel

2018 ◽  
Vol 32 (19) ◽  
pp. 1840055 ◽  
Author(s):  
Jong Seok Kim ◽  
Yeong Min Park ◽  
Sang Yoon Kim ◽  
Mun Ki Bae ◽  
Dong Qi ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Fatigue Testing ◽  
Low Cost ◽  
Testing Machine ◽  
Wear Test ◽  
Lap Joints ◽  
Fretting Wear ◽  
Relative Slip ◽  
Normal Forces ◽  
Fretting Damage

Fretting occurs at the contact area between two materials under load and in the presence of minute relative surface motion by vibration or external force. Bearings, clutches, riveted and bolted lap joints are subjected to fretting damage. Friction coefficient, materials of the specimen, contact surface pressure, relative slip amplitudes, temperatures and environment have an effect on the fretting. In this study, fretting wear test is conducted with SCM415 (Cr–Mo alloy steel) which are much used for making gears and shafts because of its excellent machinability, good mechanical properties and low cost, compared with those of the existing machine structural steels. In order to determine the fretting wear type, fretting wear fixture which can be attached to the servo hydraulic fatigue testing machine is made. And then, specimens and fretting pad with a constant curvature are made of SCM415 materials. Different normal forces and displacement amplitudes are applied to the fretting pad and diamond-like carbon (DLC) is coated on the fretting pad for fretting wear test.

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