New Life Prediction Method of the Grease by the Activation Energy

Ide, Azusa; Asai, Yasufumi; Takayama, Akio; Akiyama, Motoharu

doi:10.2474/trol.6.45

Cited by 6 publications

(2 citation statements)

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“…A decrease in the yield stress of the lithium grease at elevated temperature was reported in Reference [19]. Ide et al [20] found the activation energy based on Arrhenius's law as an appropriate parameter for life prediction of lithium greases.…”

Section: Degradation Systems Of Greasesmentioning

confidence: 90%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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The aim of the paper was to discuss different effects, such as, among others, agglomeration of selected nanoparticles, particularly those from zirconia, on the tribological behavior of lubricants. The explanation of the difference between the concepts of ‘aggregation’ and ‘agglomeration’ for ZrO2 nanoparticles is included. The factors that influence such an agglomeration are considered. Classification and thickeners of grease, the role of additives therein, and characteristics of the lithium grease with and without ZrO2 additive are discussed in the paper. The role of nanoparticles, including those from ZrO2 utilized as additives to lubricants, particularly to the lithium grease, is also discussed. The methods of preparation of ZrO2 nanoparticles are described in the paper. The agglomeration of ZrO2 nanoparticles and methods to prevent it and the lubrication mechanism of the lithium nanogrease and its tribological evaluation are also discussed. Sample preparation and a ball-on disc tester for investigating of spinning friction are described. The effect of ZrO2 nanoparticles agglomeration on the frictional properties of the lithium grease is shown. The addition of 1 wt.% ZrO2 nanoparticles to pure lithium grease can decrease the friction coefficient to 50%. On the other hand, the agglomeration of ZrO2 nanoparticles in the lithium grease can increase twice the friction coefficient relative to that for the pure grease.

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Section: Degradation Systems Of Greasesmentioning

confidence: 90%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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“…A decrease in grease yield stress at higher temperature was also shown by Karis,et al (16), Gow (17), and Froishterer (18). Ide, et al (19) predicted the grease life of lithium soap-thickened grease using thermogravimetry tests. They concluded that the activation energy based on Arrhenius's law is an appropriate parameter in grease life prediction.…”

Section: Introductionmentioning

confidence: 99%

A Master Curve for the Shear Degradation of Lubricating Greases with a Fibrous Structure

Zhou

Bosman

Lugt

2018

Tribology Transactions

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In this article, the mechanical aging behavior of lubricating greases with a fibrous structure is studied by aging fresh samples at controlled shear rates and temperatures in an in-house-made Couette aging machine. The rheological properties of fresh and aged samples were evaluated in a plate-plate rheometer. In the absence of oxygen, no chemical reactions occurred. The results showed that shear degradation is accelerated by increasing the temperature. This thermal effect can be described by an Arrhenius law. A grease aging master curve was created to describe the influence of shear and temperature on the mechanical aging of fibrous structured grease. Next, the model was validated using a conventional grease worker test. Finally, the model was applied to full ball bearings using an R0F þ bearing test rig. The master curve forms an important contribution to the development of grease life models.

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An engineering model to estimate consistency reduction of lubricating grease subjected to mechanical degradation under shear

Rezasoltani

Khonsari

2016

Tribology International

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New Life Prediction Method of the Grease by the Activation Energy

Cited by 6 publications

References 0 publications

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

A Master Curve for the Shear Degradation of Lubricating Greases with a Fibrous Structure

An engineering model to estimate consistency reduction of lubricating grease subjected to mechanical degradation under shear

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