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Zhang B.,No. 92117 Troops | Xu Y.,Academy of Armored force Engineering | Wang J.-H.,No. 92117 Troops | Wang X.-B.,CAS Lanzhou Institute of Chemical Physics
Mocaxue Xuebao/Tribology | Year: 2014

Some No. 3 non-soap greases were prepared using sub-micron attapulgite powders as the thickenerwhich were modified by organic agent, and the gather alpha olefins synthetic base oil. The SRV-IV type friction and wear tester was used to carry on the friction and wear test, and scanning electron microscopy, energy dispersive spectrometry and X-ray photoelectron spectroscopy were used to analyze the wear surface and cross-section morphology, element composition, distribution and valence, and the phase composition. Results show that the non-soap attapulgite grease form an uneven composite repairing layer which was composed of multi-elements (e.g. Mg, O, Fe, C, Si), multiple phase on the frictional surface. Finally, the repair layer formation mechanism was proposed. ©, Science Press. All right reserved.

Zhang B.,No. 92117 Troops | Xu Y.,Academy of Armored force Engineering | Wang J.-H.,No. 92117 Troops | Wu Q.-T.,No. 92117 Troops | Kang Z.-Q.,No. 91278 Troops
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

The natural silicate mineral attapulgite powders were modified respectively by a silane coupling agent KH-550 and cationic surface active agent cetyltrimethyl ammonium bromide (CTAB). Then the powder surface successfully connected branches organic group. With organic modified attapulgite powders as a thickening agent, the different labels high temperature greases were prepared, which had the dropping point above 280℃. The technical indicators of various grease samples were investigated with GB and industry standards. The German Optimal SRV-IV friction and wear machine was used to evaluate the tribological properties of grease samples under the given load variable speed and constant speed variable load conditions. And SEM, EDS and XPS were used to analyze the friction surface. The results showed that: each grease sample's technical indicators are in line with national standards and industry standards for grease performance requirements, and greases have excellent extreme pressure; the load and speed affect the tribological properties of grease samples made of KH-550 modified attapulgite very much, tribological properties of which are lower than the overall samples which were prepared by CTAB modified attapulgite powders; the high-temperature grease, whose thickener was organic attapulgite powders, has a forming repairing layer on the friction surface function in lubrication process.

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