Influence of post-sintering sizing process on the tribological behaviour of self-lubricating iron-based composite

Anselmo, Letícia Maria; Lamim, Thiago de Souza; Hromatka, Matheus; Mello, José Daniel Biasoli de; Klein, Aloı́sio Nelmo; Hammes, Gisele; Binder, Cristiano

doi:10.1016/j.wear.2022.204287

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…The strong influence of the surface finish on the tribological behaviour observed for the self-lubricating composites [141] led the group to focus on surface finish, in particular resulting from turning [187,188], post-sintering sizing [189], and cryogenic hardening [190]. Also noteworthy are some activities associated with fundamental aspects of tribomaterials, such as a thermodynamic approach to sintering [191], the thermal stability of MoS 2 in powder injection moulding [192], physicochemical characterization of tribolayers by micro-Raman and glow-discharge optical emission spectroscopy (GDOES) [193], and finally, bio tribological aspects affecting the development of dispersions to mitigate the oropharyngeal dysphagia [194].…”

Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

Brazilian Tribology: origin, status quo and future perspectives

de Mello,

Costa

2023

Surf. Topogr.: Metrol. Prop.

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This first regional issue published in STMP highlights the potential and importance of the research carried out in Latin America regarding surface engineering and tribology. In order to celebrate this important initiative, a complete historical account of Brazilian tribology is presented for the first time. It initiates with the first steps of Brazilian tribology in the 1980s, followed by the evolution and expansion of tribology research both in academic centres and industry. Focus is given to two outstanding achievements of Brazilian tribology: the fully flexible engines that run at any proportion of ethanol and gasoline and a fully innovative, completely oil-less family of hermetic compressors. The status-quo of the current research groups on tribology is described. Finally, the future trends envisaged by the Brazilian tribology community are presented.

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Section: Brazilian Tribology: Status Quomentioning

confidence: 99%

Brazilian Tribology: origin, status quo and future perspectives

de Mello,

Costa

2023

Surf. Topogr.: Metrol. Prop.

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“…Porous iron-based slide bearings are being produced as pure iron bearings without any additions, with a small graphite addition (0.4–1.0% or 0.5–2% of C), and with considerable copper content (1–5% or even 15–25% Cu) with or without graphite. There are also iron bearings being made with up to 3.5% lead added, depending on the application and needs, as well as iron bearings with added manganese, silicon, tin, nickel, or molybdenum disulfide [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, sleeves sintered from iron powder with the addition of a selected amount of hexagonal boron nitride (h-BN) to allow for increased load-bearing capacity and durability, and with the use of appropriately selected lubricating oil, are not widely known, at this time [ 2 , 6 ]. In this study, the maximum content of boron nitride in the tested bearings was set at 3% by weight, which resulted from previous tests carried out by the authors of [ 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Permeability and Load Capacity of Iron Porous Bearings with the Addition of Hexagonal Boron Nitride

et al. 2022

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Due to their properties, porous sliding bearings are considered to be maintenance-free, which means that no lubrication is required during operation. Their design enables operation at low rotational speeds with high load. Another effect of this bearing design is the lubrication continuity in the tribological pair. In this study, the selected tribological properties (such as load capacity and permeability) of new-generation iron porous bearings with boron nitride powder were experimentally investigated. Tests were carried out under various conditions, using unique test apparatus. The addition of 3% (weight) of hexagonal boron nitride (hBN) significantly increased the load capacity of tested porous bearings in comparison to the same standard bearings containing 2.5% copper. The obtained pgr·v rating reached almost 7 MPa, which is a value almost three times higher than the requirements for this type of bearing. It is worth emphasizing that such a result was obtained despite a noticeable deterioration in the air and oil permeability of the bearing.

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Dual in-situ observation of tribochemical and morphological evolution of single-layer WS2 and multi-layer WS2/C coatings

Liu,

Han,

et al. 2024

Friction

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The outstanding tribological performance of transition metal dichalcogenides (TMDs) is attributed to their unique sandwich microstructure and low interlayer shear stress. This advantageous structure allows TMDs to demonstrate exceptional friction reduction properties. Furthermore, the incorporation of TMDs and amorphous carbon (a-C) in multi-layer structures shows excellent potential for further enhancing tribological and anti-oxidation properties. Amorphous carbon, known for its high ductility, chemical inertness, and excellent wear resistance, significantly contributes to the overall performance of these multi-layer coatings. To gain an in-depth understanding of the tribological mechanism and evolution of TMDs’ multi-layer coatings, a dual in-situ analysis was carried out using a tribometer equipped with a 3D laser microscope and a Raman spectrometer. This innovative approach allowed for a comprehensive evolution of the tribological, topographical, and tribochemical characteristics of both single-layer WS2 and multi-layer WS2/C coatings in real time. The findings from the dual in-situ tribotest revealed distinct failure characteristics between the single-layer WS2 coating and the multi-layer WS2/C coating. The single-layer WS2 coating predominantly experienced failure due to mechanical removal, whereas a combination of mechanical removal and tribochemistry primarily influenced the failure of the multi-layer WS2/C coating. The tribological evolution process of these two coatings can be classified into four stages on the basis of their tribological behavior: the running-in stage, stable friction stage, re-deposition stage, and lubrication failure stage. Each stage represents a distinct phase in the tribological behavior of the coatings and contributes to our understanding of their behavior during sliding.

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Influence of post-sintering sizing process on the tribological behaviour of self-lubricating iron-based composite

Cited by 3 publications

References 27 publications

Brazilian Tribology: origin, status quo and future perspectives

Brazilian Tribology: origin, status quo and future perspectives

Permeability and Load Capacity of Iron Porous Bearings with the Addition of Hexagonal Boron Nitride

Dual in-situ observation of tribochemical and morphological evolution of single-layer WS2 and multi-layer WS2/C coatings

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