Correlation Between Engine Oil Degradation, Tribochemistry, and Tribological Behavior with Focus on ZDDP Deterioration

2019 ◽  
Vol 67 (2) ◽  
Author(s):  
Nicole Dörr ◽  
Josef Brenner ◽  
Andjelka Ristić ◽  
Bettina Ronai ◽  
Charlotte Besser ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
Engine Oil ◽  
Oil Degradation

scholarly journals Tribological Performance Investigation of a Commercial Engine Oil Incorporating Reduced Graphene Oxide as Additive

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 386
Author(s):  
Hakan Kaleli ◽  
Selman Demirtaş ◽  
Veli Uysal ◽  
Ioannis Karnis ◽  
Minas M. Stylianakis ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Tribological Behavior ◽  
Control Sample ◽  
Protective Layer ◽  
Steel Ball ◽  
Carbon Accumulation ◽  
Engine Oil ◽  
Wear Scar Diameter ◽  
Reduced Graphene

We investigated the tribological behavior of commercialized, fully synthetic engine oil upon the incorporation of reduced graphene oxide in seven different concentrations between 0.01 and 0.2 wt %. Stability of the prepared samples was assessed by turbidimetry and dynamic light scattering measurements, and their tribological properties through a reciprocating tribometer, using a steel ball on special cut steel blocks. The addition of 0.02 wt % of reduced graphene oxide led to an improvement of the tribological behavior compared to the pristine engine oil, by significantly lowering the friction coefficient by 5% in the boundary lubrication regime. Both the surfaces and the reduced graphene oxide additive were thoroughly characterized by microscopic and optical spectroscopy techniques. We also verified that a protective layer was formed between the worn surfaces, due to the presence of reduced graphene oxide. Carbon accumulation and various additive elements such as Ca, Zn, S and P were detected on the rubbing surfaces of both the ball and the block through energy-dispersive X-ray spectroscopy. Finally, it was shown that the wear scar diameter on the surface of the steel ball was lower by 3%, upon testing the engine oil sample containing reduced graphene oxide at concentration 0.02 wt %, compared to the control sample.

Tribological behavior of dodecylamine functionalized graphene nanosheets dispersed engine oil nanolubricants

2019 ◽  
Vol 131 ◽  
pp. 605-619 ◽  
Author(s):  
Gayatri Paul ◽  
Subhasis Shit ◽  
Harish Hirani ◽  
Tapas Kuila ◽  
N.C. Murmu
Keyword(s):  
Tribological Behavior ◽  
Graphene Nanosheets ◽  
Engine Oil ◽  
Functionalized Graphene

Comparison of engine oil degradation observed in laboratory alteration and in the engine by chemometric data evaluation

2013 ◽  
Vol 65 ◽  
pp. 37-47 ◽  
Author(s):  
Charlotte Besser ◽  
Nicole Dörr ◽  
Franz Novotny-Farkas ◽  
Kurt Varmuza ◽  
Günter Allmaier
Keyword(s):  
Data Evaluation ◽  
Engine Oil ◽  
Oil Degradation

scholarly journals Engine Oil Degradation Induced by Biodiesel: Effect of Methyl Oleate on the Performance of Zinc Dialkyldithiophosphate

ACS Omega ◽  
2019 ◽  
Vol 4 (14) ◽  
pp. 16166-16170 ◽  
Author(s):  
Jiu Wang ◽  
Tianxi He ◽  
Chunyu Song ◽  
Xiaoqing Li ◽  
Boshui Chen
Keyword(s):  
Methyl Oleate ◽  
Engine Oil ◽  
Oil Degradation ◽  
Zinc Dialkyldithiophosphate

Synthesis of Surface-Modified Oil-Soluble Silica Nanospheres and Investigation of their Tribological Behavior

2011 ◽  
Vol 266 ◽  
pp. 30-33 ◽  
Author(s):  
Xiao Hong Li ◽  
Jing Jing Huang ◽  
Tian Cong Cai ◽  
Zhi Jun Zhang
Keyword(s):  
Electron Microscope ◽  
Tribological Behavior ◽  
Engine Oil ◽  
Silica Nanospheres ◽  
Covalent Bonds ◽  
Transmission Electron ◽  
Soluble Silica ◽  
Promising Application ◽  
Surface Modified

Silica nanospheres with good dispersibility in oily solvents were prepared using a facile in-situ surface-modification route. The microstructure of resultant surface-capped silica nanospheres was analyzed with a transmission electron microscope. The tribological behavior of the silica nanospheres as additive in engine oil SE 15W/40 was evaluated using a four-ball machine; and the morphology and composition of the worn steel surfaces were analyzed using a scanning electron microscope equipped with an energy dispersive X-ray analysis attachment. It was found that organic modifier hexamethyldisilazane (HMDS) was combined with nano-SiO2 by covalent bonds, resulting in varied surface properties and improved dispersibility of the nanoparticles in many organic mediums. Besides, oil-soluble silica nanospheres as additive in the engine oil had excellent friction-reducing and antiwear abilities, showing promising application prospect.

Lubricant Degradation Studies Using a Single Cylinder Research Engine

2005 ◽  
Author(s):  
P. M. Lee ◽  
M. Priest ◽  
M. S. Stark ◽  
J. J. Wilkinson ◽  
J. R. Lindsay Smith ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Tribological Performance ◽  
Operating Conditions ◽  
Engine Oil ◽  
Oil Degradation ◽  
Lubricant Degradation ◽  
Reduce Fuel Consumption ◽  
Single Cylinder ◽  
Degradation Studies ◽  
Piston Assembly

With increasing pressure on engine oil manufacturers to extend oil drain intervals and reduce fuel consumption, whilst changing the composition of fully formulated oils to meet new CEC, ILSAC and OEM specifications, there is ever increasing need to understand the effect of oil degradation on the operating conditions and tribological performance of engines. This poster presents mechanical changes made to a single cylinder research engine to enable the study of lubricant degradation, its transport and how this links to piston assembly tribology. A summary of the research undertaken using these changes and a sample of results obtained to date are also presented.

Comparing oil condition in diesel and gasoline engines

2020 ◽  
Vol 72 (8) ◽  
pp. 1033-1039
Author(s):  
Adam Agocs ◽  
Serhiy Budnyk ◽  
Marcella Frauscher ◽  
Bettina Ronai ◽  
Charlotte Besser ◽  
...  
Keyword(s):  
Design Methodology ◽  
Engine Oil ◽  
Base Number ◽  
Oil Degradation ◽  
Special Issue ◽  
Maintenance Strategies ◽  
Content Type ◽  
Gasoline Engines ◽  
Total Base ◽  
New Generation

Purpose This paper aims to compare the conditions of in-service oils from diesel and gasoline engines, with focus on nitration. Design/methodology/approach Oil conditions of seven engine oil samples from five diesel-fueled vehicles and nine oil samples from eight gasoline-fueled vehicles with total mileage ranging from 13,600 to 30,000 km were determined via Fourier-transform infrared spectroscopy as well as neutralization number (NN) and total base number titration. Findings Chemical deterioration was characterized by significant differences in oxidation, nitration, NN increase and residual aminic antioxidant contents. Social implications Submitted in connection with the Special Issue, “Young Tribologists – Insights into the work of the new generation”. Originality/value Uncovering differences in the oil degradation of oils from gasoline and diesel engines enables improved condition-based maintenance strategies and the prediction of oil condition dependent tribological performance.

Preparation of Warm Compacted NbC Reinforced Iron-Based Composite and Its Tribological Behavior

2007 ◽  
Vol 534-536 ◽  
pp. 913-916
Author(s):  
Zhi Yu Xiao ◽  
Tungwai Leo Ngai ◽  
Li Pin Wen ◽  
Yuan Yuan Li
Keyword(s):  
Tribological Behavior ◽  
Combustion Engine ◽  
Wear Behavior ◽  
Engine Oil ◽  
Bench Test ◽  
Mixed Powder ◽  
Severe Wear ◽  
Warm Compaction ◽  
Suitable Material ◽  
Iron Based

A 15 wt.% NbC particulate reinforced iron-based composite was prepared by using warm compaction PM technique. It possesses a high relative density of 98%, a tensile strength of 515 MPa, a hardness of HRC 58 and a remarkable tribological behavior. Warm compaction was used because it can provide compacts with high green density and also increase the formability of the mixed powder. Furthermore, it can provide green strength that is strong enough to handle compacts before sintering. Block on ring tribotester was employed to study the compact’s friction and wear behavior using GCr15 steel as counterpart. A load of 980 N was used. The friction coefficient was 0.085 when the number 20 engine oil as lubricant was used. The results showed that the sintered composite has excellent wear resistivity. This material was then applied in the valve-guide cup of a combustion engine and subject to 500 hour bench test. The cup showed good performance for this test and did not shown any severe wear on the working surface after the test was completed. Therefore, it is a suitable material for parts that are exposed to severe wear condition.

The Tribological and Chemical Analysis of Top Ring Zone Samples of Fully Formulated Oil Taken From a Four Stroke Gasoline Engine

2005 ◽  
Author(s):  
Peter M. Lee ◽  
M. Priest ◽  
M. S. Stark ◽  
J. J. Wilkinson ◽  
J. R. Lindsay-Smith ◽  
...  
Keyword(s):  
Steady State ◽  
Chemical Analysis ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Tribological Performance ◽  
Operating Conditions ◽  
Engine Oil ◽  
Oil Degradation ◽  
Reduce Fuel Consumption ◽  
Work Samples

With increasing pressure on engine oil manufacturers to extend oil drain intervals and reduce fuel consumption, whilst changing the composition of fully formulated oils to meet the new CEC, ILSAC and OEM specifications, there is an ever increasing need to understand the effect of oil degradation on the operating conditions and tribological performance of engines [1]. This work samples oil from the rear of the top piston ring of an engine during the first 15 minutes from cold start and operating at steady state under three different loads. These samples, used 40 hour sump oil and fresh oil have been subjected to tribological tests and chemical analysis.

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