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硅铝型天然陶瓷矿物添加剂对柴油机油润滑性能的影响

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  • 发布时间:2014-03-15
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Tribological properties of aluminum silicate (Al4[Si4O10](OH)8) mineral micro-powders, with an average size of 1μm, as diesel engine oil (50CC lubricating oil) additive were evaluated on an end-face friction and wear tester. The morphologies, element distributions and micro mechanical properties of the worn surface were investigated by means of scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and nano-indentation tester, respectively. Results indicate that friction reduction and wear resistance properties of 50CC oil improve effectively by adding natural mineral micro-powder. The minimal value of the coefficient and wear rate can be obtained when the micro-powders concentration is 0.75%(mass fraction). It can be inferred that a protective film composed of Si, A1 and O forms on the worn surface. The film exhibits an average hardness (H) of 7.05 GPa, which is 69.8% higher than that of worn surface lubricated with base oil. Whereas its average modulus (E) is about 237.4 GPa, as is still with steel substrate level.采用端面式摩擦磨损试验机考察平均粒径约为1gm的羟基硅酸铝(Al2[Si2O5](0H)4)天然矿物微粉作为重载车辆柴油机油添加剂的摩擦学性能,利用SEM、EDS和纳米压痕仪对摩擦表面进行形貌、元素和微观力学性能分析。结果表明,硅酸铝矿物微粉作为柴油机油(50CC润滑油)添加剂具有优异的摩擦学性能,可显著提升50CC润滑油的抗磨减摩性能,且在0.75%(质量分数)的添加量下表现出最佳的摩擦学性能。硅酸铝矿物可在摩擦表面形成一层富含Si、Al、O等元素的摩擦表面膜,该膜层的平均硬度达到7.05GPa,较基础油润滑摩擦表面平均硬度高69.8%,而平均弹性模量(E1达237.4GPa,与基体金属相当。

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