Influence of boric acid additive size on green lubricant performance

Lovell, Michael R.; Kabir, M. A.; Menezes, Pradeep L.; Higgs, C. Fred

doi:10.1098/rsta.2010.0183

Cited by 109 publications

(61 citation statements)

References 52 publications

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“…The inorganic fullerenes have a layer lattice structure which, once exfoliation occurs, is believed to provide low shear strength sheets that adhere to the surfaces to reduce sliding friction in a similar fashion. Other nanoparticulate solids also having layer lattice structure, such as hexagonal boron nitride [224,235] and boric acid [236], have also been shown to reduce friction, probably by a similar mechanism.…”

Section: Nanoparticle Additive Research; 1990 To Presentmentioning

confidence: 99%

Friction Modifier Additives

2015

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The need for energy efficiency is leading to the growing use of additives that reduce friction in thin film boundary and mixed lubrication conditions. Several classes of such friction modifier additive exist, the main ones being organic friction modifiers, functionalised polymers, soluble organo-molybdenum additives and dispersed nanoparticles. All work in different ways. This paper reviews these four main types of lubricant friction modifier additive and outlines their history, research and the mechanisms by which they are currently believed to function. Aspects of their behaviour that are still not yet fully understood are highlighted.

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Section: Nanoparticle Additive Research; 1990 To Presentmentioning

confidence: 99%

Friction Modifier Additives

2015

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“…, solid lubricants such as boric acid and hexagonal boron nitride (hBN) have excellent lubrication properties [65,70,71]. These additives are readily available and environmentally safe.…”

Section: Tribology Of Green Additivesmentioning

confidence: 99%

Tribology of Green Lubricants

Mannekote

Menezes

Kailas

et al. 2013

Tribology for Scientists and Engineers

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Increased demand to protect the environment from mineral oil based lubricants has necessitated replacing them with products derived from natural resources. In addition to this a combination of environmental, health, and economic challenges has also renewed interest in the development and use of green lubricants over the last two decades. This chapter gives an overview of green lubricants beginning from their ancient use to the challenges prospective of the lubricant industry. The review includes structural and chemical properties of important vegetable oils and chemical modification of vegetable oils. Tribological behavior of products based on vegetable oils, green additives, and ionic liquids under varied testing conditions is also presented. This study also gives an insight into the testing procedures and sustainability aspects of green lubricants and additives.

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“…These oils include engine oils, transmission fluids, hydraulic fluids, and gear oils. These products are not typically environmentally friendly or biodegradable and can introduce significant quantities of pollutants into the waste stream [3]. Thus, disposal of these large volumes of material obviously represents an environmental burden.…”

Section: Introductionmentioning

confidence: 99%

Self-Lubricating Behavior of Graphite-Reinforced Composites

Menezes

Reeves

Rohatgi

et al. 2013

Tribology for Scientists and Engineers

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Lubricants are extensively used between contacting surfaces to reduce friction and wear. Typically, liquid lubricants are used to achieve low friction and wear. However, these lubricants are not effective in elevated temperature applications or vacuum environments. For these reasons, solid lubricants are utilized to meet these operational needs, where liquid lubrication is impractical. Solid lubricants are only effective as long as they are present in the tribo-interface. Therefore, it is desirable to provide a constant supply of solid lubricant material to the contacting surface. This is often achieved by incorporating solid lubricants as a second phase in the base material. These composite materials have the ability to achieve low friction and wear at the contact surfaces without any external supply of lubrication during sliding. Metal matrix composites reinforced with lamellar solid lubricant particles such as graphite are being used as self-lubricating materials for various engineering applications. In this chapter, the tribological behavior of metal and ceramic matrix composites reinforced with graphite particles has been reviewed. More specifically, copper-graphite, nickel-graphite, magnesiumgraphite, silver-graphite, aluminum-graphite, silicon nitride-graphite, and alumina-graphite composites are studied. The influence of various environmental and mechanical parameters on the friction coefficient and wear rate is discussed. It was found that the amount of graphite released on the worn surface forms a thin transfer film on the contact surfaces. This transfer film reduces the overall friction coefficient and wear rate. The presence of the graphite-based transfer film increases the seizure resistance and enables the contacting surfaces to run under boundary lubrication without galling. The formation and retention of this transfer film on the sliding surface as well as its composition, area fraction, thickness, and hardness are important factors in controlling the friction and wear behavior of the material. The effectiveness of the transfer film also depends on the nature of the sliding surface, the test condition, environment, and the graphite content in the composite.

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Influence of boric acid additive size on green lubricant performance

Cited by 109 publications

References 52 publications

Friction Modifier Additives

Friction Modifier Additives

Tribology of Green Lubricants

Self-Lubricating Behavior of Graphite-Reinforced Composites

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