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使用AMSLER摩擦磨损试验机进行摩擦磨损试验,研究超细羟基硅酸镁粉体作为润滑油添加剂在磨损后摩擦副表面的自修复特性。使用扫描电子显微镜、能谱仪和X射线光电子能谱分析了2种润滑油润滑下磨损后的45#钢环的表面形貌和化学组成。结果显示:经50h纯润滑油润滑后在45#钢表面出现了大量的划痕,而之后经50h含添加剂润滑油润滑后这些划痕被自修复膜所覆盖。这层自修复膜主要由Fe,O,Si,C和Mg构成,这表明粉体添加剂在摩擦磨损过程中可以向磨损的金属表面发生转移。自修复膜的形成原理是这些粉体可以吸附到钢的磨损后新鲜表面,之后在接触表面的剪切应力下铺展于磨损后金属表面。这层自修复薄膜可以明显提高金属摩擦副的抗磨损性能。
AMSLER friction and wear testing machine friction and wear tests to study ultrafine hydroxy magnesium silicate powder as a lubricant additive friction after wear on the surface of the self-healing properties. The surface morphology and chemical composition of 45 # steel rings worn by two lubricating oils were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. The results showed that a large amount of scratches appeared on the surface of 45 # steel after 50 hours of pure lubricating oil, and then the scratches were covered by self-repairing membrane after 50 hours of lubricating oil containing additives. This layer of self-healing film is mainly composed of Fe, O, Si, C and Mg, indicating that the powder additive can migrate to the worn metal surface during the friction and wear process. Self-healing membranes are formed on the principle that these powders can adsorb to the wear fresh steel surface and then spread to the worn metal surface under the shear stress of the contact surface. This layer of self-healing film can significantly improve the wear resistance of the metal friction pair.