【作者】 周明；

【导师】 毛大恒；

【作者基本信息】 中南大学 ， 机械工程， 2014， 硕士

【摘要】 摘要：随着石化、冶金、矿山等行业的发展,越来越多的机械设备的润滑处于高温极压环境。为了满足高温、高压极端工况下的需要,本文在高碱性复合磺酸钙基润滑脂基础上通过引入钛基稠化团制备出高碱性复合磺酸钙基-钛基润滑脂,并通过添加纳米WS2/MoS2复合粒子制备出一种高性能纳米复合磺酸钙基-钛基润滑脂。通过电镜面扫描和SEM分析研究了纳米WS2/MoS2复合粒子在润滑脂中的分散均匀性,发现通过传统的单一机械搅拌分散或单一超声波分散对纳米粒子在润滑脂中的分散作用效果不理想,而对纳米粒子在强超声／机械搅拌球磨作用下进行表面修饰处理后再加入润滑脂中可使纳米粒子在润滑脂中均匀分散。通过四球摩擦试验分析了纳米WS2/MoS2复合粒子对复合磺酸钙基-钛基润滑脂摩擦学性能的影响,发现当纳米WS2/MoS2的添加量为1.5wt%时具有最佳的摩擦学性能,此时最大无卡咬负荷值为1323N,烧结载荷超过6370N,分别比基础脂提高了26%和超过30%。并且发现当纳米WS2与纳米MoS2的质量比为3：1时,纳米复合磺酸钙基-钛基润滑脂的摩擦学性能最佳。通过极压抗磨测试和高温台架实验分析了纳米复合磺酸钙基-钛基润滑脂在多种工况下的摩擦学性能,发现纳米WS2/MoS2复合粒子在低温低载下对润滑脂的润滑性能影响较小,而在高温重载下能显著改善润滑脂的摩擦学性能,并延长其使用寿命。更多还原

【Abstract】 Abstract:With the development of the metallurgical, petrochemical and Mine industry etc, increasing numbers of mechanical equipments have been worked in high temperature and extreme pressure environment. To satisfy the needs for high temperature and extreme pressure conditions, calcium sulfonate complex-titanium based composite grease was prepared by introducing titanium thickening clusters into calcium sulfonate complex base grease, and by adding nano WS2/MoS2particles gain a high performance nanometer calcium sulfonate complex-titanium based composite grease.Dispersible uniformity of WS2/MoS2complex nanoparticles in calcium sulfonate complex-titanium based composite grease was studied by SEM analyze and surface scan. It was found that the dispersing effect of nanoparticles in grease was not so well by traditional mechanical agitation or ultrasonic method, while after surface modification treatment under compound action of hign power ultrasonic and ball-milling stir, then added into grease, the nanoparticles can be evenly dispersed in the grease.The effect of nano WS2/MoS2particles on tribology properties of calcium sulfonate complex-titanium based composite grease was analyzed by four-ball tribology tests. The results show that the calcium sulfonate complex-titanium based composite grease has the best tribology properties when its WS2/MoS2complex nanoparticles content is1.5wt%, in this case, the maximum non-seizure load is1323N, sintering load is over6370N, increased by26%and more than30%respectively. And the grease has better tribology properties when the mass ratio of nano-WS2to nano-MoS2is3:1.The tribology properties of calcium sulfonate complex-titanium based composite grease under multi engineering conditions was analyzed by extreme pressure and antiwear testing and high temperature bearing bench testing. The results indicate that under low temperature and low load condition, WS2/MoS2compelx nanoparticles has insignificant effects on grease; while under high temperature and high load condition, WS2/MoS2compelx nanoparticles could significantly improve the tribological performance of grease and prolonging service life.更多还原