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中文摘要：
以10～50nmSi02制备了分别以二甲基硅油、NBR硅油以及PAO-40为基础油的复合润滑脂，考察了其流变与触变性。采用Casson模型，拟合所得到的复合润滑脂流变曲线表明，纳米SiO2的比表面积越小，所制备的复合润滑脂的屈服应力和表观黏度越大。比表面积大的纳米SiO2制备的复合润滑脂易形成均相非触变流体，升高温度将会显著诱导负触变环的产生，从而降低润滑脂稳定性。在高剪切速率时，在3种制备的复合润滑脂中，纳米SiO2-二甲基硅油复合润滑脂的黏温性能最佳。这种复合润滑脂独特的触变效应是由其内部SiO2纳米粒子絮状微结构和黏滞运动所造成。
英文摘要：
10--50 nm SiO2 was used to prepare composite lubricating greases, in which dimethyl silicon oil, NBR silicon oil and PAO-40 were used as base oil, respectively, and their special rheological properties were investigated. The rheological curves of these composite lubricating greases were fitted by Casson model. Results indicated that the lower specific surface area of nano- SiO2 created the higher yield stress and apparent viscosity of their composite lubricating greases. The composite lubricating grease could easily become a homogeneous non-thixotropic fluid due to the addition of nano-SiO2 of larger specific surface area, which significantly induced the negative thixotropic loop as the temperature rising, resulting in the stability reduction. The viscosity- temperature characteristics of nano-SiO2 composite lubricating grease with dimethyl silicon oil as base oil were the best at relatively high shear rate, compared to that of the other two prepared composite lubricating greases. Such special thixotropic effect was thought to be resulted from the flocculent microstructure and adhesion motion of the nano-SiO2 in the composite lubricating greases.
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