The Effect of Slider Geometry on the Performance of a Powder Lubricated Bearing

Heshmat, Hooshang; Heshmat, Crystal A.

doi:10.1080/10402009908982264

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…An innovative promising approach has been recently identified as powder lubrication at which granular flow concept has to be applied and studied. The results of Heshmat [2] attests to powders' capability to generate ''quasi-hydrodynamic type'' pressure and thus yield positive load-carrying capacity. Heshmat's measurements reveal about ''powder pressure'' in the clearance space of a sliding bearing with very similar features to that of a liquid lubricated bearing.…”

Section: Introductionmentioning

confidence: 96%

“…Conventional liquid lubricants are completely ineffective under extremely hot operating conditions (at temperatures greater than 200°C) as they tend to lose their lubricating capability. At the high contact stresses and temperatures, conventional liquid lubricants are unable to withstand the temperatures because of its' destruction [2]. Some engine components suffer poor lubrication at elevated temperatures that presents a serious problem for many mechanical systems such as bearings and piston rings.…”

Section: Introductionmentioning

confidence: 99%

“…As shown by Heshmat [2], there are huge technological gains that can be achieved due to characterization of the powder lubricant behavior in high temperature sliding bearings and other friction units. Most lubrication schemes at these higher temperatures have centered on solid lubricants applied as coatings, generated as replenishing films, or introduced as flowing granules.…”

Section: Introductionmentioning

confidence: 99%

“…The surface engineering approach of solid lubrication with MoS2 and WS2 nanoparticles is discussed in this paper. The * METAL FORMING INSTITUTE, 14 JANA PAWŁA II STR., 61-139 POZNAŃ, POLAND # Corresponding author: weinert@inop.poznan.pl nanoparticle dichalcogenide powders chosen for lubrication are known to be attractive solid lubricants because they exhibit low values of friction coefficients [1,2]. For example, experimental results from a conventional pin-on disk apparatus at low speeds have suggested tungsten disulfide, WS2, as superior lubricant to molybdenum disulfide, MoS2, because it maintains a lower coefficient of friction and provides higher wear resistance of counterparts for a higher temperature conditions [2].…”

Section: Introductionmentioning

confidence: 99%

“…Heshmat's measurements reveal about ''powder pressure'' in the clearance space of a sliding bearing with very similar features to that of a liquid lubricated bearing. An improvement of sliding bearing performance with solid lubricant powders using Heshmat [2] quasi-hydrodynamic approach and Khonsary et al [5][6][7] theory of granular lubrication is still lacking in literature, in particular, for the high temperature conditions. the determination of influence of surface modification of high temperature sliding bearings with solid lubricant nanoparticles on the friction and wear properties of the is shown to be very important, and it is the main goal of this paper, which is continuation of analysis shown in [3].…”

Section: Introductionmentioning

confidence: 99%

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Surface Modification Of The High Temperature Porous Sliding Bearings With Solid Lubricant Nanoparticles

Wiśniewska-Weinert¹

2015

Archives of Metallurgy and Materials

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A surface modification of stainless steel bearing sleeves is developed to improve the tribology characteristics at high temperature. Solid lubricant nano-and microparticles are applied for this purpose. To create the quasi-hydrodynamic lubrication regimes, the solid lubricant powder layer is made by developed pressure impregnation technique. Porous sliding bearing sleeve prototypes were made by powder metallurgy technique. The purpose of the paper is to define the friction and wear characteristics of the sleeves and to determine the influence of sealing of the sliding interface on these characteristics. It is found that application of WS 2 sold lubricant nano-and micro-particles and preservation of a particle leakage out of interface allows to achieve at the high temperature the friction coefficients comparable to those at ambient temperature.Keywords: bearing sleeves, solid lubricant, powder layer, powder metallurgy, nano-and micro-particles Opracowano modyfikację powierzchni bieżni łożysk wykonanych ze stali nierdzewnej w celu poprawy charakterystyki tribologicznej w podwyższonej temperaturze poprzez zastosowanie stałego czynnika smarnego w postaci nano-i mikro-cząstek. W celu wytworzenia warunków kwasi-hydrodynamicznego smarowania, wytworzono warstwę z proszku smarnego na drodze infiltracji ciśnieniowej. Celem pracy było wyznaczenie charakterystyki ściernej i zużyciowej bieżni oraz określenie wpływu uszczelnienia ślizgających się powierzchni na te charakterystyki. Stwierdzono, że zastosowanie WS 2 jako stałego smaru w postaci nano-i mikro-cząstek oraz zabezpieczenie wypływu z granicy fazowej pozwala uzyskać wartość współczynnika tarcia porówny-walną z otrzymywaną dla temperatury otoczenia.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface Modification Of The High Temperature Porous Sliding Bearings With Solid Lubricant Nanoparticles

Wiśniewska-Weinert¹

2015

Archives of Metallurgy and Materials

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Prediction of coefficient of friction of solid powder lubricants under high pressure conditions using machine learning algorithms

Jose,

Suryawanshi,

Behera

2024

Materialwissenschaft Werkst

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Conventional liquid lubricants prove inadequate for effective lubrication in conditions characterized by high temperatures and high vacuum environments. In such extreme scenarios, powder lubricants emerge as a more viable solution. The present study is to conduct a series of experiments using a reciprocating wear test setup and evaluate the capability of four different machine learning models in analysing the tribological attributes of metals when lubricated with three distinct powder types: zirconium dioxide, copper oxide, and molybdenum disulfide, specifically under conditions of elevated contact pressures and dry environments. The experiments were systematically carried out encompassing a range of load and temperature combinations. Four different machine learning models (MLP, KNN, extreme gradient boosting and light gradient‐boosting machine) were used for predicting the coefficient of friction of metals lubricated with different powders. Extreme gradient boosting machine learning model gives better result than the other models with mean absolute error, root mean squared error, R2 value and average absolute deviation percentage of 0.0215, 0.0278, 0.9962 and respectively.

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