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Lubricants, Volume 1, Issue 2 (June 2013), Pages 22-60

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Research

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Open AccessArticle Interaction between Lubricants Containing Phosphate Ester Additives and Stainless Steels
Lubricants 2013, 1(2), 48-60; doi:10.3390/lubricants1020048
Received: 6 April 2013 / Revised: 16 April 2013 / Accepted: 25 April 2013 / Published: 17 May 2013
Cited by 5 | PDF Full-text (4252 KB) | HTML Full-text | XML Full-text
Abstract
One way to improve fuel efficiency in today’s jet aircraft engines is to create an environment for higher operating temperatures and speeds. New and improved lubricants and bearing materials must be developed to remain stable in these elevated operating temperatures. Three lubricants, [...] Read more.
One way to improve fuel efficiency in today’s jet aircraft engines is to create an environment for higher operating temperatures and speeds. New and improved lubricants and bearing materials must be developed to remain stable in these elevated operating temperatures. Three lubricants, with varying amounts of tricresyl phosphate added as an anti-wear/extreme pressure additive were tested on two different stainless steels at varying temperatures ranging from 300 °C to 350 °C in vacuum. Significant decomposition of the lubricant base-stocks and the phosphate ester additive did occur in most of the trials resulting in the formation of carboxylic acids and phenols. In these cases a film containing phosphorus was deposited onto the stainless steel substrate. Full article
(This article belongs to the Special Issue Additives for Lubricants)
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Review

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Open AccessReview Nanotribological Behavior of Carbon Based Thin Films: Friction and Lubricity Mechanisms at the Nanoscale
Lubricants 2013, 1(2), 22-47; doi:10.3390/lubricants1020022
Received: 31 December 2012 / Revised: 28 January 2013 / Accepted: 1 March 2013 / Published: 2 April 2013
Cited by 12 | PDF Full-text (512 KB) | HTML Full-text | XML Full-text
Abstract
The use of materials with very attractive friction and wear properties has raised much attention in research and industrial sectors. A wide range of tribological applications, including rolling and sliding bearings, machining, mechanical seals, biomedical implants and microelectromechanical systems (MEMS), require thin [...] Read more.
The use of materials with very attractive friction and wear properties has raised much attention in research and industrial sectors. A wide range of tribological applications, including rolling and sliding bearings, machining, mechanical seals, biomedical implants and microelectromechanical systems (MEMS), require thin films with high mechanical strength, chemical inertness, broad optical transparency, high refractive index, wide bandgap excellent thermal conductivity and extremely low thermal expansion. Carbon based thin films like diamond, diamond-like carbon, carbon nitride and cubic boron nitride known as “super-hard” material have been studied thoroughly as the ideal candidate for tribological applications. In this study, the results of experimental and simulation works on the nanotribological behavior of carbon films and fundamental mechanisms of friction and lubricity at the nano-scale are reviewed. The study is focused on the nanomechanical properties and analysis of the nanoscratching processes at low loads to obtain quantitative analysis, the comparison obtain quantitative analysis, the comparison of their elastic/plastic deformation response, and nanotribological behavior of the a-C, ta-C, a-C:H, CNx, and a-C:M films. For ta-C and a-C:M films new data are presented and discussed. Full article
(This article belongs to the Special Issue Nanotribology and Atomic Mechanisms of Friction)
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