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.
Tribology International – Elsevier
Published: Jun 1, 1997
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