表面改性海泡石纳米纤维作为润滑油添加剂的摩擦学行为

doi:10.11896/cldb.20060224

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Abstract Sepiolite natural mineral powders were modified and refined by using the mechanochemistry wet modification process, and the nano-scale sepiolite short-fiber were obtained which could be dispersed stably in lubricating oil. Tribological behaviors of the surface modified sepiolite powders as 500SN mineral oil additives were studied with tribopairs of GCr15/45^# steel by an oscillating wear tester. The morphology, chemical composition and nano-scale mechanical properties of the worn metal surface were analyzed by scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS) and instrumented nanoindentation tester.The anti-wear and friction reducing mechanism of the surface modified sepiolite as lubricating oil additives was discussed. Results show that the surface modified sepiolite exhibited excellent tribological properties as lubricating oil additives,which could significantly reduce the friction coefficient and wear volume. Compared with 500SN oil, the friction coefficient and wear volume of the 45^# steel lubricated by sepiolite oil decreased 69.5% and 71.7% respectively, when the load was 100 N and the frequency was 20 Hz. Partial sepiolite fibers in oil directly participated in the complex tribochemical reactions on the metal surface, and a tribofilm consisting of metal oxide, oxide ceramic, graphite and organics was formed on the worn surface of the 45^# steel. The formation of the film is closely related to (1) the layer structure of sepiolite mineral, (2) its cleavage fracture and release of oxygen under different friction conditions, and (3) the destruction of crystal structure and reorganization of the active groups.

Key words： sepiolite surface modified anti-wear and friction reducing additives

Published: 03 August 2021

CLC number:

TH117.3

Fund:National Key R&D Program of China (2017YFB0310703) and National Natural Science Foundation of China (52075544).

About author:: Yanli Yin received her master degrees in June 2010 from Beijing Institute of Technology. She is currently a lecture in the National Key Laboratory for Remanufacturing of Army Academy of Armored Forces (AAAF) and participates in the research of remanufacturing engineering, lubricant additives and lubricant materials.
Helong Yu received his Ph.D. degree in materials from Army Academy of Armored Forces (AAAF) in 2016. He is currently an associate professor in the National Key Laboratory for Remanufacturing of AAAF and participates in the research of surface engineering, remanufacturing engineering, lubricant additives and military new materials. He has published more than 80 acade-mic papers and authorized 20 national invention patents.

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	YIN Yanli
	YU Helong
	WANG Hongmei
	WeiMin
	SHI Peijing
	BAI Zhimin
	ZHANG Wei
	XU Binshi

Cite this article:

YIN Yanli,YU Helong,WANG Hongmei, et al. Tribological Behaviors of Surface-modified Sepiolite Nanofibers as a Lubricant Additive[J]. Materials Reports, 2021, 35(14): 14017-14024.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20060224 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14017

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