A phenomenological elevated temperature friction model for viscoelastic polymer coatings based on nanoindentation

Lan, Pixiang; Zhang, Youfeng; Dai, Wei; Polycarpou, Andreas A.

doi:10.1016/j.triboint.2017.11.009

Cited by 29 publications

(11 citation statements)

References 38 publications

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“…On this, the Voigt model was used to determine Young's modulus (elastic) of A, B, C, and E samples. It was calculated by curve tting the slope of the initial unloading curve [50]. e studies demonstrated the elastic modulus values at 0.6 MPa (samples A and B), 6.2 MPa (sample C), and 12 MPa (sample E), according to increased sti ness of polymeric matrix.…”

Section: Infrared Radiation-induced Synthesis and Characterization Ofmentioning

confidence: 99%

PHEMA Hydrogels Obtained by Infrared Radiation for Cartilage Tissue Engineering

Passos

Carvalho

Rodrigues³

et al. 2019

International Journal of Chemical Engineering

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Although the exposure of polymeric materials to radiation is a well-established process, little is known about the relationship between structure and property and the biological behavior of biomaterials obtained by thermal phenomena at 1070 nm wavelength. This study includes results concerning the use of a novel infrared radiation source (ytterbium laser fiber) for the synthesis of poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogel in order to produce medical devices. The materials were obtained by means of free radical polymerization mechanism and evaluated regarding its cross-linking degree, polymer chain mobility, thermal, and mechanical properties. Their potential use as a biomaterial toward cartilage tissue was investigated through incubation with chondrocytes cells culture by dimethylmethylene blue (DMMB) dye and DNA quantification. Differential scanning calorimetry (DSC) results showed that glass transition temperature (Tg) was in the range 103°C–119°C, the maximum degree of swelling was 70.8%, and indentation fluency test presented a strain of 56%–85%. A significant increase of glycosaminoglycans (GAGs) concentration and DNA content in cells cultured with 40 wt% 2-hydroxyethyl methacrylate was observed. Our results showed the suitability of infrared laser fiber in the free radicals formation and in the rapid polymer chain growth, and further cross-linking. The porous material obtained showed improvements concerning cartilage tissue regeneration.

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Section: Infrared Radiation-induced Synthesis and Characterization Ofmentioning

confidence: 99%

PHEMA Hydrogels Obtained by Infrared Radiation for Cartilage Tissue Engineering

Passos

Carvalho

Rodrigues³

et al. 2019

International Journal of Chemical Engineering

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“…At a high applied load of 106 N, the wear track of Inconel 625 becomes rather smooth and is found to be covered with an adhesion tribo-layer. In the previous works, microstructural changes and tribochemical reaction are often observed near wear tracks in microcrystalline materials, most commonly in the form of the nanocrystalline tribo-layer [57][58][59][60][61][62][63][64][65][66]. Such microstructural refinement can result in a further hardened surface and thus leading to the enhancement of the wear-resistance.…”

Section: Tribological Testsmentioning

confidence: 99%

Superior Mechanical Behavior and Fretting Wear Resistance of 3D-Printed Inconel 625 Superalloy

Gao¹,

Zhou

2018

Applied Sciences

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Additive manufacturing (AM) nickel-based superalloys have been demonstrated to equate or exceed mechanical properties of cast and wrought counterparts but their tribological potentials have not been fully realized. This study investigates fretting wear behaviors of Inconel 625 against the 42 CrMo4 stainless steel under flat-on-flat contacts. Inconel 625 is prepared by additive manufacturing (AM) using the electron beam selective melting. Results show that it has a high hardness (335 HV), superior tensile strength (952 MPa) and yield strength (793 MPa). Tribological tests indicate that the AM-Inconel 625 can suppress wear of the surface within a depth of only ~2.4 μm at a contact load of 106 N after 2 × 104 cycles. The excellent wear resistance is attributed to the improved strength and the formation of continuous tribo-layers containing a mixture of Fe2O3, Fe3O4, Cr2O3 and Mn2O3.

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“…Generally, there are three typical stages that occur in the fretting running progress [44][45][46]. In the initial stage (stage I), the friction coefficients are relatively small, which could be due to two reasons: first, because of the protection and lubrication of fresh films on contacting surfaces; and second, because of the relative high roughness at very beginning of contact that causes a higher contact pressure, resulting in low friction [47,48]. After approximately 10 or 100 cycles, the curves increase quickly and enter the ascent stage (stage II), due to the adhesion and abrasion between the contact interfaces that are more flattened with the bigger contact area.…”

Section: Friction Kinetics Behaviormentioning

confidence: 99%

Torsional Fretting Wear Properties of Thermal Oxidation-Treated Ti3SiC2 Coatings

2018

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In this study, efforts were made to oxidize the Ti3SiC2 coating surface to improve its wear resistance by producing oxide layers and healing microcracks that initiated from the thermal sprayed process. Tribological behaviors of the thermal oxidation-treated Ti3SiC2 coatings subjected to various temperatures (200, 300, and 400 °C) and durations (1, 3, and 5 h) were investigated comparatively by fretting wear. The results showed that the thickness of the oxide layer and the average content of element O on the surface were gradually increased with increasing temperature. Lower friction coefficients were observed in coatings at 200–400 °C for 1 h. Better performance of crack-healing features was demonstrated at 400 °C, whereas fresh microcracks were formed under the fretting condition due to the fragility of oxides at the same time. The tribological behavior of thermal oxidation-treated Ti3SiC2 coatings was mainly controlled by delamination and abrasive wear. The volume losses induced by wear scars decreased with the increase in oxidation time under the oxidation treatment at 200 °C and increased with increasing oxidation time under the oxidation temperatures of 300 and 400 °C.

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A phenomenological elevated temperature friction model for viscoelastic polymer coatings based on nanoindentation

Cited by 29 publications

References 38 publications

PHEMA Hydrogels Obtained by Infrared Radiation for Cartilage Tissue Engineering

PHEMA Hydrogels Obtained by Infrared Radiation for Cartilage Tissue Engineering

Superior Mechanical Behavior and Fretting Wear Resistance of 3D-Printed Inconel 625 Superalloy

Torsional Fretting Wear Properties of Thermal Oxidation-Treated Ti3SiC2 Coatings

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