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Lubricants, Volume 2, Issue 2 (June 2014), Pages 44-112

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Review

Open AccessReview Graphite and Hybrid Nanomaterials as Lubricant Additives
Lubricants 2014, 2(2), 44-65; doi:10.3390/lubricants2020044
Received: 3 January 2014 / Revised: 3 March 2014 / Accepted: 7 March 2014 / Published: 24 April 2014
Cited by 6 | PDF Full-text (1457 KB) | HTML Full-text | XML Full-text
Abstract
Lubricant additives, based on inorganic nanoparticles coated with organic outer layer, can reduce wear and increase load-carrying capacity of base oil remarkably, indicating the great potential of hybrid nanoparticles as anti-wear and extreme-pressure additives with excellent levels of performance. The organic part [...] Read more.
Lubricant additives, based on inorganic nanoparticles coated with organic outer layer, can reduce wear and increase load-carrying capacity of base oil remarkably, indicating the great potential of hybrid nanoparticles as anti-wear and extreme-pressure additives with excellent levels of performance. The organic part in the hybrid materials improves their flexibility and stability, while the inorganic part is responsible for hardness. The relationship between the design parameters of the organic coatings, such as molecular architecture and the lubrication performance, however, remains to be fully elucidated. A survey of current understanding of hybrid nanoparticles as lubricant additives is presented in this review. Full article
(This article belongs to the Special Issue Additives for Lubricants)
Open AccessReview Abrasive Resistant Coatings—A Review
Lubricants 2014, 2(2), 66-89; doi:10.3390/lubricants2020066
Received: 27 February 2014 / Revised: 31 March 2014 / Accepted: 18 April 2014 / Published: 21 May 2014
Cited by 11 | PDF Full-text (2459 KB) | HTML Full-text | XML Full-text
Abstract
Abrasive resistant coatings have been widely used to reduce or eliminate wear, extending the lifetime of products. Abrasive resistant coatings can also be used in certain environments unsuitable for lubrications. Moreover, abrasive resistant coatings have been employed to strengthen mechanical properties, such [...] Read more.
Abrasive resistant coatings have been widely used to reduce or eliminate wear, extending the lifetime of products. Abrasive resistant coatings can also be used in certain environments unsuitable for lubrications. Moreover, abrasive resistant coatings have been employed to strengthen mechanical properties, such as hardness and toughness. Given recently rapid development in abrasive resistant coatings, this paper provides a review of major types of abrasive coatings, their wearing mechanisms, preparation methods, and properties. Full article
Open AccessReview Reducing Friction and Wear of Tribological Systems through Hybrid Tribofilm Consisting of Coating and Lubricants
Lubricants 2014, 2(2), 90-112; doi:10.3390/lubricants2020090
Received: 6 March 2014 / Revised: 8 April 2014 / Accepted: 17 April 2014 / Published: 23 June 2014
Cited by 7 | PDF Full-text (754 KB) | HTML Full-text | XML Full-text
Abstract
The role of surface protective additives becomes vital when operating conditions become severe and moving components operate in a boundary lubrication regime. After protecting film is slowly removed by rubbing, it can regenerate through the tribochemical reaction of the additives at the [...] Read more.
The role of surface protective additives becomes vital when operating conditions become severe and moving components operate in a boundary lubrication regime. After protecting film is slowly removed by rubbing, it can regenerate through the tribochemical reaction of the additives at the contact. However, there are limitations about the regeneration of the protecting film when additives are totally consumed. On the other hand, there are a lot of hard coatings to protect the steel surface from wear. These can enable the functioning of tribological systems, even in adverse lubrication conditions. However, hard coatings usually make the friction coefficient higher, because of their high interfacial shear strength. Amongst hard coatings, diamond-like carbon (DLC) is widely used, because of its relatively low friction and superior wear resistance. In practice, conventional lubricants that are essentially formulated for a steel/steel surface are still used for lubricating machine component surfaces provided with protective coatings, such as DLCs, despite the fact that the surface properties of coatings are quite different from those of steel. It is therefore important that the design of additive molecules and their interaction with coatings should be re-considered. The main aim of this paper is to discuss the DLC and the additive combination that enable tribofilm formation and effective lubrication of tribological systems. Full article
(This article belongs to the Special Issue Tribology of Carbon-Based Coatings)
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