A Transient Heat Transfer Model for Assessment of Flash Temperature During Dry Sliding Wear in a Pin-on-Disk Tribometer

Mondal, Manas Kumar; Biswas, Koushik; Maity, Joydeep

doi:10.1007/s11661-015-3224-6

Cited by 23 publications

(9 citation statements)

References 20 publications

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“…This is because at elevated temperatures, the composite coating is softened, and the material is easier to flow than at room temperature. The temperature at the point of contact may even reach the melting point of the polymer, 48 , 49 which results in the irregular wear tracks.…”

Section: Resultsmentioning

confidence: 99%

Characterization of graphene-filled fluoropolymer coatings for condensing heat exchangers

Cierpisz

McPhedran

et al. 2021

Journal of Composite Materials

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Condensing heat exchangers are thermal devices subjected to extremely corrosive environments due to the formation of acidic condensates on the heat-exchange elements during service. To protect the heat exchangers from chemical attack, perfluoroalkoxy (PFA) coating has been applied as a barrier layer onto the surfaces of the heat-exchange elements to prevent corrosion. However, PFA has intrinsically poor thermal conductivity, and low wear resistance; thus, it is not naturally a good material for heat exchanger application. In this study, graphene nanoplatelets (GNPs) are incorporated into PFA powder as coating materials to improve the thermal properties of the fluoropolymer, for condensing heat exchangers application. Two grades of GNPs (8 nm and 60 nm layer thickness) are tested to evaluate the effect of graphene addition on the thermal, adhesion, electrical, and wear properties of the composites, which are compared to those mixed with multi-walled carbon nanotubes (MWCNTs). The results showed that both grades of GNPs significantly increased the thermal conductivity, i.e., ∼8× that of the virgin PFA. The composites incorporated with both grades of GNPs also demonstrated good coating adhesion strength and wear resistance, as well as excellent corrosion resistance. The composite filled with MWCNTs exhibited poor surface finish and minimal improvement in thermal performance.

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Section: Resultsmentioning

confidence: 99%

Characterization of graphene-filled fluoropolymer coatings for condensing heat exchangers

Cierpisz

McPhedran

et al. 2021

Journal of Composite Materials

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“…In this paper, although the radius of diamond tip was 30 mm, the actual contact areas between tip and PI composites were far less than the nominal contact area. Consequently, the flash temperature at contact point caused by friction was much higher than the bulk temperature (Mondal et al, 2016). Due to the low thermal conductivity of the PI composites, flash temperature caused by friction at the contact point would soften the contact layer and deteriorate the mechanical properties of PI composites (Zhang et al, 2009).…”

Section: Friction and Wear Behaviors Of The Porous Polyimide Compositesmentioning

confidence: 99%

“…Due to the low thermal conductivity of the PI composites, flash temperature caused by friction at the contact point would soften the contact layer and deteriorate the mechanical properties of PI composites (Zhang et al, 2009). Moreover, higher flash temperature generated with increasing of sliding velocity and normal load inevitably (Mondal et al, 2016). Consequently, the friction coefficient decreased with increasing sliding velocity due to the thermal softening at the contact point.…”

Section: Friction and Wear Behaviors Of The Porous Polyimide Compositesmentioning

confidence: 99%

“…Moreover, some pits caused by adhesive wear were observed under 3 and 5 N, as shown in Figure 8(b) II and III. According to the frictional heat formula, flash temperature is proportional to normal load (Mondal et al, 2016). Consequently, the higher normal loads can accurate the removal of the soft layer caused by frictional heating and some pits caused by adhesive wear were appeared in the wear track [Figure 8(b)].…”

Section: Morphologies Of the Porous Polyimide Compositesmentioning

confidence: 99%

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The friction and wear behaviors of polyimide bearing retainer under point-contact condition

Zhang

Zhang²,

Zhou³

et al. 2020

ILT

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Purpose Random point-contact between the space bearing retainer and the rolling elements may cause wear of the space bearing retainer. The paper aims to clarify the friction and wear behaviors of polyimide bearing retainer under point-contact condition. Design/methodology/approach Space bearing retainers were cut into flat specimens and the tribological behaviors of the specimens were studied under point-contact condition using a friction and wear testing machine. Different sliding velocities and normal loads were used to simulate the running state of space bearing retainer. The wear behaviors of the space bearing retainer were analyzed by SEM and white light interferometer. Findings The friction coefficient of the polyimide composites decreased with increase in sliding velocity from 1 to 5 mm/s. Moreover, with increase in sliding velocity and normal load, the wear rate of the polyimide composites decreased and increased, respectively. Moreover, the wear behaviors of the polyimide composites were mainly determined by the combined actions of ploughing friction and adhesive friction. The lubricating properties of transfer film and wear debris were limited under point-contact condition. Practical implications The paper includes implications for the understanding of the wear mechanism of the polyimide composites space bearing retainer under point-contact condition and then to optimize space bearing retainer materials further. Originality/value Under point-contact condition, wear debris can hardly participate in the friction process because of limited contact area. Consequently, the wear debris has limited impact on the wear process to decrease the friction and wear. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0017/

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“…The change in friction coefficient and temperature equations [125] with time for transient and steady-state adhesive wear can be determined using Equations (22) and (23), respectively.…”

mentioning

confidence: 99%

A Unified Treatment of Tribo-Components Degradation Using Thermodynamics Framework: A Review on Adhesive Wear

Koottaparambil

Khonsari

2021

Entropy

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An extensive survey of open literature reveals the need for a unifying approach for characterizing the degradation of tribo-pairs. This paper focuses on recent efforts made towards developing unified relationships for adhesive-type wear under unlubricated conditions through a thermodynamic framework. It is shown that this framework can properly characterize many complex scenarios, such as degradation problems involving unidirectional, bidirectional (oscillatory and reciprocating motions), transient operating conditions (e.g., during the running-in period), and variable loading/speed sequencing.

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A Transient Heat Transfer Model for Assessment of Flash Temperature During Dry Sliding Wear in a Pin-on-Disk Tribometer

Cited by 23 publications

References 20 publications

Characterization of graphene-filled fluoropolymer coatings for condensing heat exchangers

Characterization of graphene-filled fluoropolymer coatings for condensing heat exchangers

The friction and wear behaviors of polyimide bearing retainer under point-contact condition

A Unified Treatment of Tribo-Components Degradation Using Thermodynamics Framework: A Review on Adhesive Wear

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