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Study on the Preparation and Tribological Properties of NbX2 （X=S, Se） Nanolubricants

Author: ZhangWei
Tutor: LiChangSheng
School: Jiangsu University
Course: Materials Science
Keywords: Nanomaterial Solid-reaction Solid-lubricate Additive Transitional metal dichalcogenides Tribological Capability
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 78
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Abstract


Adding additives into oil reduce friction and wear and even to mend the worn surface has been widely applied in lubrication engineering for quite a long time.But,the research and development of more effective additives have never been ceased since all kinds of additives mentioned above are still not perfect,especially their effect of the wear repairing is far from satisfactory.With the aid of nano-materials,a lot of novel work has been done with enormous encouraging achievements obtained because the tribological properties have been anhanced obviously.So transitional metal dichalcogenides were prepared as nanostructures（such as tubes,wires and particles）,the unique closed nanostructure（nanotubes, nanowires,nanobundles） formed with rolled up materials have eliminated the fringe dangling bonds,thereafter they improve the chemical stability. Applied in lubricating oil,one sides,the nano-materials act as spacer between the two friction surface,and some ever proposed that the nano-materials were rolling like a ball in the grinding area which leads to the reduction of friction coefficient.Another sides,nano-materials deposit on the friction surfce and compensate the loss of mass,the so-called mending effect.In this article,experimental investigation and theoretical analysis were carried out on the preparation process and tribological properties of transitional metal dichalcogenides and diselenium NbX2（X=S,Se） nanostructures.Firstly,The solid-phase reaction was used to produce NbS2 nanotubes（nanowires）,in evacuated and sealed quartz ampoules by mixed S and Nb powder.The component and microstructure of NbS2 were investigated by means of X-ray diffraction（XRD）,scanning electronic microscope（SEM） and transmission electronic microscope（TEM）.Secondly,NbSe2 nanofibers were obtained by heating sealed quartz ampoules by mixed Se and Nb in high temperature boxed furnace.Besides, the mixture of Se and Nb powders were milling in high energy ball-milling machine,the mixture after milling were heat in tubular furnace,a lot of NbSe2 nanoparticles produced in mixture of Ar and N2.The component and microstructure of NbSe2 were investigated by means of X-ray diffraction （XRD）,scanning electronic microscope（SEM） and transmission electronic microscope（TEM）.Thirdly,for example NbSe2,the growth and conditions of nanowires （nanofibers） and were discussed including reactional temperature,keep temperature time,coefficient of exceeding Se and so on,and the growth mechanism of NbSe2 nanostructures were discussed in simply.Fourthly,The tribological properties of NbS2 and NbSe2 nanowires, acting as additives,were investigated in UMT-2 machine.Besides,NbSe2 nanoparticles were added in basic oil,the tribological properties of them were UMT-2 test in different conditions.Then the tribological behavior of them were discussed and the tribological properties of different shapes NbSe2 were compared.At last,the friction mechanism of lubrication including NbX2 as additives was discussed preliminary.The lubrication has excellent tribological proerties in high load may be due to the following factors:one dimensional nanomaterial has unique closed structures,lubrication films and fill up-repair mechanism.

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