Analysis on the mechanical characteristics of PTFE oil seal for the rear part in the automotive engine

Choi, Hyun-Jin; Park, Chulwoo; Lee, Jong‐Cheol; Kim, Jong-Gab; Choi, Seong-Dae

doi:10.1007/s12541-011-0062-3

Cited by 14 publications

(8 citation statements)

References 1 publication

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“…The polymer lip seals, which are strained as a result of shaft mounting, have received a great deal of attention as they are often used in mechanical engineering. A lot of studies and simulations have been developed and presented, in which strain and stress in shaft-seated seals have been determined [11,12,13,14]. Their aim was to obtain the possibility of forecasting frictional resistance and durability of seals.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Kujawa¹,

Kowalewski²,

Wieleba³

2019

Polymers

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Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state that they interact frictionally, e.g., in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of, e.g., assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 h. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness, and surface free energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Deformed materials have a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Deformation under tension without heating of polymeric material (PE-HD), e.g., as a result of assembly, has been qualified as a threat to be taken into account when designing and analysing polymeric sliding elements.

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Section: Introductionmentioning

confidence: 99%

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Kujawa¹,

Kowalewski²,

Wieleba³

2019

Polymers

View full text Add to dashboard Cite

show abstract

“…The polymer lip seals, which are strained as a result of shaft mounting, have received a great deal of attention because they are often used in mechanical engineering. Many studies and simulations have been developed and presented, thanks to which strain and stress in shaft-seated seals have been determined [11][12][13][14][15]. Their aim was to obtain the possibility of forecasting frictional resistance and durability of seals.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Kujawa

Kowalewski

Wieleba

2019

Preprint

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Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state they interact frictionally e.g. in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of e.g. assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 hours. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness and free surface energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Strained material had a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Tension without heating of polymeric material (PE-HD), e.g. as a result of assembly, has been qualified as a hazard to be taken into account when designing and analysing polymeric sliding elements.

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“…Among several polymers that are often utilized as mechanical components, polytetrafluoroethylene (PTFE) is an especially important industrial polymer as it is chemically stable and has relatively low friction coefficient . PTFE is generally used as an anti‐adhesion coating due to its low surface energy and good hydrophobicity . However, PTFE also has disadvantages of having relatively low mechanical strength and poor wear resistance .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of polytetrafluoroethylene–carbon nanotube composite coatings for friction and wear reduction

et al. 2016

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Polytetrafluoroethylene (PTFE) matrix with inherently low friction was prepared in the form of a coating and reinforced with carbon nanotubes (CNTs) to enhance its wear resistance. PTFE–CNT composite coatings with various CNT contents were deposited on silicon (100) substrates by spin coating followed by a heat treatment process. The effects of cooling rate during the heat treatment process on the morphology, mechanical properties as well as friction and wear behavior of the coatings were investigated under different loading conditions. It was revealed that the slow‐cooled PTFE–CNT composite coating containing 1 wt% and 5 wt% CNT had the highest wear resistance with respect to the applied normal load. The overall experimental results demonstrated that, in comparison to pure PTFE coating, the friction and wear behavior of PTFE–CNT composite coatings could be improved by incorporating an optimum amount of CNT in the PTFE matrix and performing the heat treatment under a specified condition. POLYM. COMPOS., 39:E710–E722, 2018. © 2016 Society of Plastics Engineers

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Analysis on the mechanical characteristics of PTFE oil seal for the rear part in the automotive engine

Cited by 14 publications

References 1 publication

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Fabrication of polytetrafluoroethylene–carbon nanotube composite coatings for friction and wear reduction

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