Comprehensive mechanical and tribological characterization of metal-polymer PTFE+Pb/Bronze coating by in-situ electrical contact resistance measurement augmented tribo-mechanical tests

Maculotti, Giacomo; Goti, Edoardo; Genta, Gianfranco; Mazza, Luigi; Galetto, Maurizio

doi:10.1016/j.triboint.2024.109397

Tribology International

2024

DOI: 10.1016/j.triboint.2024.109397

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Comprehensive mechanical and tribological characterization of metal-polymer PTFE+Pb/Bronze coating by in-situ electrical contact resistance measurement augmented tribo-mechanical tests

Giacomo Maculotti,

Edoardo Goti,

Gianfranco Genta

et al.

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2024

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Cited by 3 publications

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Advancement of constant and progressive load multi‐cycle indentation method on surface properties characterization of polymers

Guru,

Sarangi

2024

Polymers for Advanced Techs

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In recent years, polymers have been popular in industrial applications due to their lightweight, corrosion‐resistant, improved surface polish, ease of manufacturing, cost‐effectiveness, and so forth. Similarly, micro/nano‐indentation has gained popularity as a technique for assessing the surface mechanical characteristics of polymers. The present study conducted comprehensive experiments using cyclic micro‐indentation on engineering polymers, specifically poly‐ether‐ether‐ketone (PEEK), poly(methyl methacrylate) (PMMA), and poly(tetra‐fluoroethylene) (PTFE). An appropriate and optimal indentation method has been proposed after analyzing the behavior and significance of all the input parameters in evaluating the properties. Both constant load multi‐cycle (CLMC) and progressive load multi‐cycle (PLMC) were considered for this investigation. A comparative evaluation has been conducted to assess two multi‐cycle tests on these materials. From the analysis of the input parameters, including maximum loads, loading and unloading rates, and the number of cycles, the unloading rate and indentation cycle are crucial factors in determining hardness (H) and elastic modulus (E). Increasing the loading rates leads to an increase in H and a reduction in E for all three materials. This effect arises from the thermal effect, which is characterized by the creep modulus and a closed hysteresis loop. Employing the holding duration and multiple cycle data in constant load multi‐cycle can significantly influence the creep behavior and use of the hysteresis loop for fatigue behavior. Similarly, a progressive load multi‐cycle indentation with a force greater than 0.5 N and a minimum of five cycles is the most accurate approach for evaluating surface mechanical parameters.

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Advancement of constant and progressive load multi‐cycle indentation method on surface properties characterization of polymers

Guru,

Sarangi

2024

Polymers for Advanced Techs

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Thin coatings thickness measurement by augmented nanoindentation data fusion

Genta,

Maculotti

2024

CIRP Annals

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Investigation of Tribological Behavior of PTFE Composites Reinforced with Bronze Particles by Taguchi Method

Ficici,

Ozdemir,

Grund

et al. 2024

J. Compos. Sci.

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Reinforced PTFE materials can be designed to show high mechanical stability against harder materials under sliding wear conditions. Especially bearing metal-reinforced PTFE is of high practical interest. In this class of materials, bronze-filled PTFE was reported to obtain high wear resistance, a low coefficient of friction (COF), and excellent self-lubrication properties in sliding conditions. In the statistical approach of this work, PTFE composites reinforced with 25 vol%, 40 vol%, and 60 vol% bronze particles were evaluated against pure PTFE regarding wear behavior under varied wear test parameters, i.e., material, normal load, and sliding speed. Wear tests were planned to use a standard orthogonal array based on the Taguchi design method. An analysis of variance test was utilized to quantify the effects of test parameters on the wear behavior of the bronze/PTFE composites and pure PTFE. According to the variance analysis, the material type has the largest influence on the COF and the specific wear rate (SWR) under test conditions of this work. Both COF and SWR were found to be influenced by the material type (29.83% and 96.16%), the normal load (33.34% and 0.95%), and sliding speed (9.14% and 1.28%). The lowest SWR and COF values were achieved at the optimum wear test conditions where the wear test parameters were 1 m/s sliding speed (A4B2C2) at PTFE + 60 vol.% bronze reinforced composite 50 N application load and 0.32 m/s sliding speed (A4B3C1) at PTFE + 60 vol.% bronze reinforced composite 100 N application load, respectively.

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Comprehensive mechanical and tribological characterization of metal-polymer PTFE+Pb/Bronze coating by in-situ electrical contact resistance measurement augmented tribo-mechanical tests

Cited by 3 publications

References 36 publications

Advancement of constant and progressive load multi‐cycle indentation method on surface properties characterization of polymers

Advancement of constant and progressive load multi‐cycle indentation method on surface properties characterization of polymers

Thin coatings thickness measurement by augmented nanoindentation data fusion

Investigation of Tribological Behavior of PTFE Composites Reinforced with Bronze Particles by Taguchi Method

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