【作者】 徐喆；

【导师】 连峰；

【作者基本信息】 大连海事大学 ， 机械电子工程， 2012， 硕士

【摘要】 A1-Mg合金具有密度小,质量轻,导电导热性好,抗腐蚀性好等优点,是目前工业领域中应用较为广泛的一类有色金属。但是由于A1-Mg合金表面耐磨性能较差,一直制约着该材料的应用。本文旨在通过改变Al-Mg合金表面润湿性,从而提高A1-Mg合金表面在水润滑条件下的摩擦学性能,为制备新型超疏水耐磨A1-Mg合金表面提供理论依据和技术支持。主要研究工作及结果如下：1、利用激光加工技术在Al-Mg合金表面加工圆台、凹坑及棱台形微结构,并沉积自组装分子膜,制备出了超疏水A1-Mg合金表面。根据三种微结构的形态建立数学模型,定量分析微结构尺寸参数对润湿性的影响。结果表明：制备的超疏水A1-Mg合金最大接触角为156。,沉积长链分子膜时的接触角随微结构间距增大而减小,沉积短链分子膜时的接触角随微结构间距增大而增大。2、在抛光Al-Mg合金表面沉积自组装分子膜,得到不同润湿性的表面,分别在干摩擦、浸水润滑、喷水润滑条件下,研究不同润湿性的A1-Mg合金表面的摩擦学性能,结果表明：对于疏水或亲水的Al-Mg合金采用喷水润滑更有利于增强表面的耐磨性,其中摩擦系数最小可达0.2239,并且三种润滑方式下的摩擦系数对比符合：干摩擦>浸水润滑>喷水润滑。研究还发现,在同种润滑方式下,疏水的A1-Mg表面耐磨性强于亲水的Al-Mg表面。3、利用环氧树脂溶液将Si02颗粒粘滞在抛光Al-Mg和摩擦偶件Si3N4表面,制备了接触角为156。的超疏水抛光Al-Mg合金和125。的疏水Si3N4,同样在干摩擦、浸水润滑、喷水润滑条件下,研究超疏水A1-Mg合金的摩擦学性能。结果表明：对超疏水Al-Mg合金采用浸水润滑方式更有利于增强表面耐磨性,其中摩擦系数最小可达0.3342,并且三种润滑方式下的摩擦系数对比符合：干摩擦>喷水润滑>浸水润滑。对于同种润滑方式下,疏水表面的耐磨性最优,超疏水表面次之,亲水表面最差。研究还发现,在摩擦与被摩擦介质之间涂覆相同材料或性能的介质时,摩擦过程中容易产生同性吸引的粘滞现象,降低了材料的耐磨性。更多还原

【Abstract】 Al-Mg alloy has a low density, light weight, good thermal conductivity, good corrosion resistance, it is a class of ferrous metals widely used in industrial areas in the current. However, due to surface wear resistance of Al-Mg alloy is poor, application of this material has been restricted. This article aims to change the surface wettability of Al-Mg alloy, thus, to improve the surface tribological properties of Al-Mg alloy under water lubrication, provide a theoretical basis and technical support for manufacture Al-Mg alloy of super-hydrophobic and wear. The main research work and results are as follows:1、Micro-structures were processed on surface of Al-Mg alloy by laser processing technology, such as frustum of a cone、notch of taper hole and pyramid, and self-assembled monolayers were deposited, Al-Mg alloy surface of superhydrophobic was prepared. The mathematical model was built according to three kinds of micro-structure morphology, quantitative analysis the affect of micro-structural size parameters on wettability. The results show that the biggest contact angle of superhydrophobic Al-Mg alloy can reach156°, the contact angles tend to smaller as the increment of the spacing of surface texture when the long-chain self-assembled monolayers were deposited, the contact angles tend to biger as the increment of the spacing of surface texture when the short-chain self-assembled monolayers were deposited.2、Self-assembled monolayers were deposited on surface of polished Al-Mg alloy, get different surfaces of wettability technology, study tribological properties of different wettability on Al-Mg alloy surface in conditions of dry friction, soaking lubrication, water-jet lubrication respectively, the results show that:more conducive to enhancing the wear resistance in water-jet lubrication for the hydrophobic or hydrophilic Al-Mg alloys, the smallest friction coefficient can reach0.2239, and contrast to coefficient of friction in three kinds of lubrications:dry friction> soaking lubrication> water-jet lubrication. The study also found that surface wear resistance of hydrophobic Al-Mg better than hydrophilic surface of Al-Mg alloy in same kinds of lubrication mode.3、SiO2particles were adhesived in the polished Al-Mg and surface of friction parts by epoxy resin solution, the contact angle of156°polished Al-Mg alloys of superhydrophobic and125°Si3N4of hydrophobicity were prepared, in conditions of dry friction, soaking lubrication, water-jet lubrication also, research on the friction properties of superhydrophobic Al-Mg alloy. The results showed that:more conducive to enhancing the wear resistance in water-jet lubrication for Al-Mg alloy superhydrophobic, the smallest friction coefficient can reach0.3342, and contrast to coefficient of friction in three kinds of lubrications:dry friction> water-jet lubrication> soaking lubrication. In same kinds of lubrication mode, the wear resistance of hydrophobic surface was best, followed by super-hydrophobic surface, hydrophilic surface was the worst. The study also found that the media of the same material or performance were coated between the friction and the friction medium, viscous phenomenon of same-sex attracted was appeared in the friction process, reducing the wear resistance of the material.更多还原