Large-scale tests on friction and wear of engineering polymers for material selection in highly loaded sliding systems

Samyn, Pieter; Baets, Patrick De; Schoukens, Gustaaf; Peteghem, A.P. Van

doi:10.1016/j.matdes.2004.12.021

Cited by 31 publications

(17 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The friction coefficient values of the PET coatings are slightly lower than that of the reference sample, 0.1, but this difference is not significant. Unal and Mimaroglu 20 reported a friction coefficient of 0.06 for PTFE, while Samyn et al 21 found a friction coefficient of 0.06 for composite PET/PTFE.In agreement with the statistical analyses of the friction coefficient, the design of experiments presented that main effects and the 2nd order interactions were not significant (Figure 6). Thus, the Hutchings 10 attributes the friction between polymers to two main mechanisms: deformation and adhesion.…”

supporting

confidence: 72%

See 1 more Smart Citation

Wear, friction, and microhardness of a thermal sprayed PET: poly (ethylene terephthalate) coating

et al. 2009

View full text Add to dashboard Cite

The effects of combustion thermal spraying parameters namely combustion pressure, feeding rate, and carrier gas on the wear resistance, friction coefficient, and Knoop hardness of poly (ethylene terephthalate) (PET) films were investigated. The PET coatings were characterized by measuring the wear coefficients by calowear-type testing, the friction coefficients by a pin-on-disk test, and Knoop hardness. The abrasive wear and friction coefficients of the coatings were compared with the values of a post consumer PET bottle chip reference sample. The structural characteristics of the coatings were investigated by X ray diffraction. Statistical analysis of the results allowed for the systematic characterization of the influence of the process variables mentioned above on the coating wear, friction, and microhardness values. Specifically, this study shows that the process parameters affect the wear coefficient and Knoop hardness significantly, but not the friction coefficient. The degree of crystallinity of the PET coatings varied from 20 to 26%. Keywords: thermal spray, PET, tribology*e-mail: rogerioxavier@yahoo.com.br, jose.branco@cetec.br, vilmaccosta@hotmail.com, calado@eq.ufrj.br 122 Nunes et al. Materials Researchparameters were 10 rpm, 14 mm trail diameter, 10-N load, 50 turns, and a traveled distance of 2,200 mm. Each sample was measured in triplicate. The samples were weighed before and after testing for calculation of mass loss. Wear testAbrasive wear was evaluated by calowear testing, which involves the interaction of a rotating steel sphere with the sample surface with alumina as an abrasive. A semi-spherical crater was formed on the contact surface of the sample. The wear rate was calculated from the crater dimension using Equations 2, 3, and 4:where D is the crater diameter, n the number of turns, R the sphere radius, V the lost volume, S the sliding distance, and Q the wear rate 12 .The wear coefficient (K) was calculated with the Archad equation 10 , where W is the applied load and H the hardness.The sliding distances of the sphere were 100, 200, 300, 500, and 1000 turns and the applied load was 13.7 N. Each sample was measured in triplicate. The crater diameter was measured by 3D profilometry. Results and Discussion Coating structureUsing an optical microscope, the presence of bubbles or pores at the substrate/coating interface and in the PET coating medium was not observed. However, they were observed on the coating-free surface. The formation of bubbles is explained in the following way. The final coating temperature was around 410 °C, below the degradation temperature of PET (420 °C). Apparently, the temperature reached by the deposited layers was sufficient for their complete coalescence between the substrate and the coating medium. Particle degradation was insignificant. This will be further discussed with the results of the infrared spectroscopy. Due to the heterogeneous size of the PET particles, the smallest ones probably melted, while the larger ones were semi-melted. During the natural cool...

show abstract

supporting

confidence: 72%

Section: Wear and Frictionmentioning

confidence: 98%

Wear, friction, and microhardness of a thermal sprayed PET: poly (ethylene terephthalate) coating

et al. 2009

View full text Add to dashboard Cite

show abstract

“…In conventional tribotesting, small-scale tests performed on unidirectional rotating pin-on-disc, bloc-on-ring or reciprocating cylinder-on-plate test rigs are mainly used because of their cost-and time-effectiveness and ease of handling small samples. However the selection of the appropriate testing equipment is not obvious (Samyn et al 2006). Test conditions can strongly differ from the real application, and extrapolations towards the actual working conditions are hard to make and often result in significant errors.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of sliding materials for seismic isolation systems

Quaglini

Dubini

Poggi

2011

Bull Earthquake Eng

View full text Add to dashboard Cite

Novel self-lubricating materials are currently being proposed to be used in sliding isolation systems such as the curved surface sliding isolator system, or pendulum bearing system, for the protection of buildings and structures. The current codes for anti-seismic devices are focused on the evaluation of the performance of the whole isolation system; as a consequence, a reliable procedure for the pre-assessment of the material combinations of sliding interfaces is currently missing. Therefore in this paper, an experimental methodology is proposed for the characterization of self-lubricating materials through tests on small-scale specimens performed using customized equipment able to reproduce the operational conditions\ud of real isolation systems as per contact pressure, sliding velocity, temperature and slide path. The testing sequence has been designed in order to evaluate the sliding properties of the material in terms of static and dynamic coefficient of friction and wear resistance. Examples are reported for the assessment of two self-lubricating materials with different sliding characteristics.\ud In order to validate the method and to confirm the reliability of extrapolating the results to real working conditions, prototypes of pendulum isolation systems incorporating the assessed materials have been tested according to North American specifications and the relevant dynamic properties assessed from the Horizontal Load—Displacement loops. The experimental outcomes confirmed\ud that the frictional characteristics provided by the proposed procedure can be reliably used in the design of seismically isolated structure

show abstract

“…The base pressure in the chamber was 4·10 -4 Pa. A 27.13 MHz RF plasma generator was applied (Dressler, Germany). High purity (4.5) N 2 was used with a flow rate of 25 cm 3 ·min -1 (STP), radiofrequency power of 75 W. The PIII treatment of the samples was performed by a high voltage pulser (ANSTO, Australia) with an accelerating voltage of 30 kV, ion fluence of 3·10 -17 cm -2 and fluence rate of 5·10 13 cm -2 ·s -1. Surface composition of the modified layer was determined by XPS (X-ray photoelectron spectroscopy) analysis by a Kratos XSAM800 spectrometer using MgK" 1,2 radiation and fixed analyser-transmission mode (using 80 and 40 eV pass energies for survey and detailed spectra, respectively).…”

Section: Methodsmentioning

confidence: 99%

“…The thermal state of contact points is often decisive on the evaluation of frictional materials. Control of temperature at the polymer contact zone is of the highest importance to ensure beneficial wear and friction behaviour, because any increase in temperature may induce changes in the material bulk properties [12,13] and polymer transfer processes. The thermal behaviour of the counter-surface could be also crucial for the temperature and tribological performance of the contact surfaces.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of plasma modified polyethylene terephthalate and polyamide-6 layers

Kalácska¹,

Keresztes

Foldi³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Tribological performance of the materials greatly depends on the temperature of the contacting zones and surfaces and hence on the heat conducting behaviour of the materials. Heat conduction of polymers is, however, greatly affected even by a very narrow (few tens of nm) modified layer formed on the surface after subjecting the polymer to plasma treatment. In this article the heat flow inhibiting properties of plasma modified surface layers were investigated on polyethylene terephthalate (PET) and polyamide-6 (PA6) engineering polymers. Nitrogen Plasma Immersion Ion Implantation gave rise to compositional and structural changes of the polymers in a depth of 110 nm. It was found that even this thin layer exhibited significant heat flow inhibiting effect. The modified layer considerably decreased the thermal conductivity coefficient of the treated polymer and resulted in a reduced heat transmission for PET and PA6 by 33 and 28%, respectively. This new information supports and is in accordance with the former tribological results about extra friction heat generation experienced under NPIII surface layer of PA6 and PET during dry sliding.

show abstract

Large-scale tests on friction and wear of engineering polymers for material selection in highly loaded sliding systems

Cited by 31 publications

References 28 publications

Wear, friction, and microhardness of a thermal sprayed PET: poly (ethylene terephthalate) coating

Wear, friction, and microhardness of a thermal sprayed PET: poly (ethylene terephthalate) coating

Experimental assessment of sliding materials for seismic isolation systems

Thermal conductivity of plasma modified polyethylene terephthalate and polyamide-6 layers

Contact Info

Product

Resources

About