Antiwear function and mechanism of borate containing nitrogen

Antiwear function and mechanism of borate containing nitrogen The antiwear capacity of a borate containing nitrogen was evaluated. The four-ball test indicated, with the increase of load, the wear scar diameters increased at first, but then decreased to and maintained a lower value after a critical maximum, when lubricated by an oil containing such borate. Surface analyses by X-ray photoelectron spectroscopy (XPS) and 18 kW rotating anode X-ray diffractometer (XRD) revealed that there were borate and boron nitride on the rubbing surfaces under high load in comparison to only borate found under low load. Therefore, it can be considered that, under mild conditions, the borate ester is absorbed physically and chemically on the rubbing surface, providing antiwear function at low load, and under severe conditions, some of absorbed borate films degrade and form boron nitride tribochemically, developing antiwear performance at high load. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tribology International Elsevier

Antiwear function and mechanism of borate containing nitrogen

Tribology International, Volume 30 (6) – Jun 1, 1997

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Ltd
ISSN
0301-679X
eISSN
1879-2464
DOI
10.1016/S0301-679X(96)00060-6
Publisher site
See Article on Publisher Site

Abstract

The antiwear capacity of a borate containing nitrogen was evaluated. The four-ball test indicated, with the increase of load, the wear scar diameters increased at first, but then decreased to and maintained a lower value after a critical maximum, when lubricated by an oil containing such borate. Surface analyses by X-ray photoelectron spectroscopy (XPS) and 18 kW rotating anode X-ray diffractometer (XRD) revealed that there were borate and boron nitride on the rubbing surfaces under high load in comparison to only borate found under low load. Therefore, it can be considered that, under mild conditions, the borate ester is absorbed physically and chemically on the rubbing surface, providing antiwear function at low load, and under severe conditions, some of absorbed borate films degrade and form boron nitride tribochemically, developing antiwear performance at high load.

Journal

Tribology InternationalElsevier

Published: Jun 1, 1997

References

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