Potentiality of triboscopy to monitor friction and wear

Santos, Marcelo Braga dos; Costa, H.L.; Mello, José Daniel Biasoli de

doi:10.1016/j.wear.2014.10.017

Cited by 28 publications

(15 citation statements)

References 34 publications

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“…A high‐frequency acquisition system was adapted to the tribometer in order to allow the acquisition of many points within each stroke using a specially developed LabView® interface. To facilitate the visualisation and interpretation of the data, a program developed in Matlab® generated a 3D triboscopic map of the variables during the tests, where z was the variable being measured (friction coefficient), x was the position of the counter body within each cycle (measured by an additional LVDT sensor) of the tests, and y was the total sliding distance, as shown in Figure B.…”

Section: Methodsmentioning

confidence: 99%

Solid lubrication in fluid film lubrication

Oliveira

Hammes

Binder

et al. 2018

Lubrication Science

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This work aims to study the effect of solid lubrication combined with a liquid lubricant in a cooperative lubrication regime. The solid lubricant consists of sintered composites, which contain solid lubricant dispersed in a metallic matrix. The durability of the lubricious regime (μ < 0.2) was studied. The combined action significantly increased the durability of the lubricious regime (3 orders of magnitude). Additionally, the use of 3D triboscopy made it possible, using an original approach, to verify a significant increase in the friction coefficient at the dead centres of the strokes. This difference between the friction coefficients was discussed in terms of the debris accumulation and the change in the lubrication regime. A preponderant role was assigned to the accumulation of debris.

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Section: Methodsmentioning

confidence: 99%

Solid lubrication in fluid film lubrication

Oliveira

Hammes

Binder

et al. 2018

Lubrication Science

Self Cite

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“…For all conditions evaluated in Fig. 9, electrical contact potential was high in the initial cycles due to the running-in period [41,42]. After stabilizing the tribo lm, also called steady-state, the lm was broken in about 2000 cycles for the dry test.…”

Section: Reciprocate Sliding Testsmentioning

confidence: 97%

Influence of Graphene Nanosheets on Thermo-Physical and Tribological Properties of Sustainable Cutting Fluids for MQL Application in Machining Processes

Baldin

Silva

Gelamo

et al. 2021

Preprint

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This study investigates the effects of applying two vegetable and one mineral-based cutting fluids with 0.05 %wt and 0.1 %wt dispersion of graphene sheets on the tribosystem generated at the interface between the cemented carbide tool and the AISI 1045 steel workpiece. The fluids are firstly characterized (viscosity, thermal conductivity and diffusivity, and wettability) and tested in reciprocating and ramp milling tests. The results show that the graphene sheets alter the thermo-physical and tribological properties of the cutting fluids; in this case, vegetable-based cutting fluids, even in minimum quantities and with graphene nanoparticles, have a high potential for increasing the efficiency and sustainability of the milling process.

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“…The nature of the substrate, DLC and load-bearing films, their respective thicknesses, the nature of the counter faces, together with the environmental conditions, are of paramount importance and play an essential role in friction and wear control of DLCbased tribosystems (Franks et al, 1990;Oguri and Arai, 1991;Donnet and Grill, 1997;Voevodin et al, 1999;Erdemir et al, 2000a,b;Erdemir, 2001;Ohana et al, 2004a,b;Vercammen et al, 2004;Cho et al, 2005;Donnet and Erdemir, 2008).…”

Section: Development Of Oil-less Hermetic Compressors Wisemotion ®mentioning

confidence: 99%

In situ Tribo-Fluorination for Oil-Less Hermetic Compressor Applications

et al. 2021

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In the present work, we overview the multidisciplinary development of a regular, lubricated, hermetic compressor which works in an on-off cycle, circular motion, single-speed, many tribological contacts, into an innovative, linear motion, variable displacement, single tribological contact, oil-less hermetic compressor presenting high versatility in terms of refrigerator design, sustainability and improved efficiency. The original approach encompassed the development of new surface engineering procedures applying purpose-oriented phases to soft substrates. Particular emphasis is given to the in situ fluorination of the tribolayer formed in the piston-cylinder tribopair. Although chlorinated halocarbons (CFC) are efficient refrigerants from a thermodynamic point of view, they do have serious environmental implications that have forced the refrigeration industry to switch to more environmentally friendly hydrofluorocarbon (HFC) based refrigerants. The first and most successful alternative to the CFCs was tetrafluorocarbon, particularly tetrafluoroethane (CF3CH2F), aka R134a refrigerant. The current trend to downsizing mechanical systems, smaller clearances, and increased speeds leading to greater energy efficiencies associated with miscibility issues imposing the use of costly, fully synthetic lubricants with the R134a refrigerant gas led to the introduction of a new hermetic compressor design, the Wisemotion®, the first, and until now, unique, oil-free hermetic compressor on the world market. In this context different types of multi-layers, their thickness, substrate material, processing routes, etc., have been studied and optimized. Si-rich hydrogenated DLC (a:C-H) presented enhanced tribological properties when tested under fluorine-rich atmospheres, and semi-industrial scale tests have been carried out to understand this point further. A homemade tribological emulator was developed allowing close-to-real tribopair, atmosphere, and imposed mechanical conditions used in an oil-free commercial hermetic compressor. The tests were carried under different stroke frequencies (5, 20, and 40 Hz) and atmospheres (R134a, ambient air, and argon). Results showed a strong influence of both atmosphere and stroke frequencies. The friction coefficients were significantly lower (~3.8X) for the refrigerant gas atmosphere, attributed to the fluorine and highly disordered graphitic structures rich tribolayers. Under the high frequency (40 Hz), the energy input seems to be a deterrent to the formation of stable tribolayers, and the DLC coating shatters on the first few sliding meters.

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Potentiality of triboscopy to monitor friction and wear

Cited by 28 publications

References 34 publications

Solid lubrication in fluid film lubrication

Solid lubrication in fluid film lubrication

Influence of Graphene Nanosheets on Thermo-Physical and Tribological Properties of Sustainable Cutting Fluids for MQL Application in Machining Processes

In situ Tribo-Fluorination for Oil-Less Hermetic Compressor Applications

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