Ashless Phosphorus–Containing Lubricating Oil Additives

2017 ◽  
pp. 157-196
Author(s):  
W. David Phillips ◽  
Neal Milne
Keyword(s):  
Lubricating Oil ◽  
Oil Additives ◽  
Phosphorus Containing ◽  
Lubricating Oil Additives

Tribological Properties of Zirconium Oxide, Spinel and Mullite Nanopowders as Lubricating Oil Additives

2016 ◽  
Vol 721 ◽  
pp. 451-455
Author(s):  
Armands Leitans ◽  
Eriks Palcevskis
Keyword(s):  
Tribological Properties ◽  
Zirconium Oxide ◽  
Friction Pair ◽  
Synthesis Method ◽  
Lubricating Oil ◽  
Nanosized Powders ◽  
Base Oil ◽  
Oil Additives ◽  
Oxide Spinel ◽  
Lubricating Oil Additives

In work investigated effects of zirconium oxide (ZrO2), spinel (MgAl2O4) and mullite (Al6Si2O13) nanosized powders on the base oil tribological properties. The nanosized (30-40nm) powders manufactured by plasma chemical synthesis method. Tribological experiments used on ball-on-disc type tribometer, measured coefficient of friction and determined metalic disc wear. Base oil used selectively purified mineral oil (conform SAE-20 viscosity) without any functional additives. Nanosized powders dispersed in base oil at 0.5; 1.0; 2.0; wt.%. At work cocluded, that the adition nanoparticles in base oil, possible reduced friction pair wear and friction coefficient. As the main results include spinel (MgAl2O4) nanoparticles 0.5 and 1.0 wt. % concentration ability reduced friction coeffiecient value.

Interactions Between Sealing Materials and Lubricating Oil Additives

1987 ◽  
Author(s):  
R. Winkenbach ◽  
E. M. von Arndt ◽  
H. Mindermann
Keyword(s):  
Lubricating Oil ◽  
Oil Additives ◽  
Lubricating Oil Additives ◽  
Sealing Materials

Tribological performance of nanoparticles as lubricating oil additives

2016 ◽  
Vol 18 (8) ◽  
Author(s):  
M. Gulzar ◽  
H. H. Masjuki ◽  
M. A. Kalam ◽  
M. Varman ◽  
N. W. M. Zulkifli ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Lubricating Oil ◽  
Oil Additives ◽  
Lubricating Oil Additives

Synthesis and Tribological Properties of S- and P-Free Borate Esters With Different Chain Lengths

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Guangbin Yang ◽  
Zhanming Zhang ◽  
Guihui Li ◽  
Jinfeng Zhang ◽  
Laigui Yu ◽  
...  
Keyword(s):  
Alkyl Chain ◽  
Liquid Paraffin ◽  
Alkyl Chain Length ◽  
Lubricating Oil ◽  
Oil Additives ◽  
Borate Esters ◽  
Lubricating Oil Additives ◽  
Steel Balls ◽  
Chain Lengths ◽  
Antiwear Ability

Three kinds of S- and P-free borate esters containing N with different alkyl chain lengths were prepared by using boric acid, ethanolamine, and alkyl-alcohol as the starting materials. The chemical structure of the products was analyzed by means of Fourier transformation infrared spectrometry, elemental analysis, and so on. The thermal stability of the products was evaluated by thermogravimetric analysis. The tribological properties of the synthesized borate esters as lubricating oil additives in liquid paraffin were evaluated using a four-ball friction and wear tester while the morphologies of the worn scars of the steel balls were observed using a scanning electron microscope. The chemical components on the worn surfaces of the steel balls were analyzed using an X-ray photoelectron spectroscopy. Results show that all the three kinds of synthetic borate esters as additives in liquid paraffin possess good antiwear performance and may be used as promising S- and P-free environmentally acceptable lubricating oil additives. Particularly, borate ester with short alkyl chain length at a low concentration in liquid paraffin was more effective in reducing wear, and the antiwear ability of the additives decreased with increasing alkyl chain length. The antiwear ability of the N-containing borate esters as additives in liquid paraffin might be closely related to the formation of hydrogen bonds via N with a high electronegativity and small atomic radius and the easy permeation of electron-deficient B on the rubbing steel surfaces.

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