Synthesis of Ultrathin WS2 Nanosheets and Their Tribological Properties as Lubricant AdditivesReportar como inadecuado




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Nanoscale Research Letters

, 11:442

First Online: 01 October 2016Received: 21 July 2016Accepted: 22 September 2016

Abstract

In this paper, ultrathin WS2 nanosheets with thickness of about 5 nm were successfully prepared by a facile solid phase reaction method. The as-synthesized samples were characterized by X-ray diffraction XRD, scanning electron microscopy SEM, and transmission electron microscopy TEM. On the basis of experimental results obtained under different reaction durations, a possible formation mechanism of WS2 nanosheets is proposed. The tribological performance of ultrathin WS2 nanosheets as additives in the 500SN base oil was tested by an UMT-2 ball-on-disc tribotester, and the worn surface of the steel disc was investigated by a non-contact optical profile testing instrument and SEM. The results showed that the friction coefficient and anti-wear property of base oil can be improved strikingly by adding ultrathin WS2 nanosheets. Especially, when the concentration of WS2 nanosheets was 1.0 wt.%, the corresponding lubricating oil exhibited the best tribological properties. Moreover, according to the investigation of the wear scar, an anti-friction and anti-wear mechanism is proposed. It is believed that the reduction of friction and wear must come from the addition of ultrathin WS2 nanosheets which can penetrate and enter the friction interface and form a continuous tribofilm on the rubbing face.

KeywordsWS2 Nanosheets Lubricant additives Tribological properties AbbreviationsEDSEnergy-dispersive spectrum

FESEMField scanning electron microscope

SAEDSelected area electron diffraction

SEMScanning electron microscopy

TEMTransmission electron microscopy

WSDWear scar diameters

XPSX-ray photoelectron spectroscopy

XRDX-ray diffraction

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Autor: Xianghua Zhang - Hongxiang Xu - Jiangtao Wang - Xia Ye - Weining Lei - Maoquan Xue - Hua Tang - Changsheng Li

Fuente: https://link.springer.com/



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