Tribological properties&nbsp; of lube added with lanthanum fluoride nanoparticles

ZHANG Xiang; ZHU Xin-he; FENG Xiao-hui; LIU Ze-ze; YAN Zhi-jun; CHENG Dong

doi:10.16411/j.cnki.issn1006-7736.2017.01.020

Journal of Dalian Maritime University >

2017 , Vol. 43 >Issue 1: 126 - 130

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2017.01.020

Tribological properties of lube added with lanthanum fluoride nanoparticles

ZHANG Xiang ,
ZHU Xin-he ,
FENG Xiao-hui ,
LIU Ze-ze ,
YAN Zhi-jun ,
CHENG Dong

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（Marine Engineering College,Dalian Maritime University,Dalian 116026,China）

Received date: 2016-07-06

Revised date: 2016-08-17

Online published: 2016-08-17

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Abstract

To optimize the preparation method of lanthanum fluoride nanoparticles and explore the tribological properties of lanthanum fluoride as lubricant additive, lanthanum fluoride(LaF₃) particles were prepared by chemical precipitation. After ball milling in all-around planetary ball mill, the grain size of lanthanum fluoride particles was decreased to nanoscale. The sample was charactered by nano laser granulometer and X-ray diffractometer(XRD). Lanthanum fluoride nanoparticles were added to base oil by using peregal OS-15 as surfactant. In order to evaluate the anti-wear and friction reducing properties of lanthanum fluoride nanoparticles in lube, four-ball experiments were carried out on universal friction and wear tester by using nanometer additive lubricating oil. Testing steel balls were observed by metalloscope and scanning electron microscope(SEM) to analyze the mechanism of anti-wear and friction reducing . Results show that the best anti-wear and friction reducing effect is with an added content of nanoparticles 2.5%; the friction coefficient of oil with lanthanum fluoride nanoparticles was reduced by 52.7% compared with that of base oil, and the wear scar diameter was reduced by 29.6%. And the wear scar of oil with lanthanum fluoride nanoparticles was more regular and smooth than that of base oil. Analysis shows that the LaF₃nanoparticles timely fill to the friction surface in the friction and wear process, and easily to combine with matrix to generate chemical reaction film, which can prevent effectively the friction and wear between the metallic matrix, and play a favourable role in reducing friction and wear.

Key words： lanthanum fluoride nanoparticles; surfactant; four-ball experiments; friction coefficient; wear scar diameter

Cite this article

ZHANG Xiang , ZHU Xin-he , FENG Xiao-hui , LIU Ze-ze , YAN Zhi-jun , CHENG Dong . Tribological properties of lube added with lanthanum fluoride nanoparticles[J]. Journal of Dalian Maritime University, 2017 , 43(1) : 126 -130 . DOI: 10.16411/j.cnki.issn1006-7736.2017.01.020

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