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  • 1
    Language: English
    In: Tribology Letters, 2013, Vol.52(1), pp.47-55
    Description: In the present paper, the influence of load and sliding speed on super-low friction of Nitinol 60 alloy was investigated experimentally using Nitinol 60 alloy pin sliding over GCr15 steel disk under castor oil lubrication. Super-low coefficient of friction (COF) of Nitinol 60 alloy was achieved at the stable state, corresponding to so-called superlubricity regime in the presence of castor oil. The experimental results indicate that sliding speed employed in the friction tests plays great roles in the lubrication behaviors of Nitinol 60 alloy. When the friction tests are executed from low sliding speed to high sliding speed, COF decreases at the initial stage and on the contrary, COF increases at the stable stage. However, with the increase in load, COF firstly increases and then decreases at the initial stage. COF is unstable but still super low and remains almost the same value at the stable stage. These phenomena are explained and discussed in viewpoint of the characteristics of castor oil during the friction tests. It is found that the influence of sliding speed on the lubrication behaviors of Nitinol 60 alloy under castor oil lubrication is more obvious than that of load due to the characteristics structure of castor oil, therefore maintaining appropriate level of sliding speed to achieve super-low friction of Nitinol 60 alloy.
    Keywords: Super-low friction ; Nitinol 60 alloy ; Castor oil ; Test parameters ; Lubrication behaviors
    ISSN: 1023-8883
    E-ISSN: 1573-2711
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  • 2
    Language: English
    In: Tribology Letters, 2015, Vol.60(2), pp.1-12
    Description: The lubrication mechanism of nanoinorganic particles during friction process has been widely investigated. However, the physical adsorption action mechanism between the nanoparticles (after modification) and friction pairs has so far never been studied in detail. In this study, the various concentrations of polyisobutyleneamine succinimide (PIBS) by weight in paraffin oil were applied to study their effect on the tribological behaviors of nano-MoS 2 oil. And the tribological results were further discussed to understand the lubricating action mechanism of nano-MoS 2 particles additive. The results show that the tribological behavior of modified nanoparticles was significantly influenced by PIBS concentration. The COF reduced from 0.139 to 0.090 with low PIBS concentration (less than 0.1 wt%), while the COF reduced to 0.126 with higher PIBS concentration (more than 0.2 wt%). By scanning electron microscopic (SEM) and energy-dispersive X-ray spectroscopy, some mechanisms likely related to this interesting results are revealed. It is identified that: (1) production of MoS 2 tribofilm on steel surface reduces the COF and wear, (2) wear scar is smooth with low PIBS concentration, while it shows plowing wear with high PIBS concentration, (3) the MoS 2 tribofilm is found by SEM on the wear scar of the nano oil with 0.05 wt% PIBS. A three-step lubricating action mechanism of the modified nano-MoS 2 particles has been proposed as an explanation for the interesting results. The results indicate that physical adsorption provide an initial action for nanoparticle lubricant to form tribofilm in boundary lubrication.
    Keywords: MoS ; Nanoparticles ; Physical adsorption ; Lubricating action mechanism ; Oil
    ISSN: 1023-8883
    E-ISSN: 1573-2711
    Library Location Call Number Volume/Issue/Year Availability
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