【作者】 付景国；

【导师】 朱新河；

【作者基本信息】 大连海事大学 ， 轮机工程， 2011， 硕士

【摘要】 本文在了解气缸套表面强化的众多方法的基础上,通过球磨机制备微纳米粉的途径探索出一种新型制备气缸套表面强化层的方法---高能球磨法,通过摩擦磨损试验表明这种方法能能够大大提高铸铁气缸套的耐磨性能。文章采用球磨法制备出蛇纹石和SiC颗粒的微纳米球磨材料,通过球磨碰撞法将微纳米材料挤渗在气缸套内表面,来达到表面强化的目的。首先依据Brizmer等建立的弹塑性接触理论,确定试验的基本参数范围；随后利用正交试验的方法,以球磨材料、球磨类型和球磨时间为正交因子制备出12组气缸套。为了验证气缸套的耐磨性能,通过摩擦磨损试验研究气缸套在不同润滑条件下的性能,对正交因子进行优化,找出最佳工艺。最后通过扫描电镜能谱仪从理论上阐述试验硬挤渗、软通道挤渗和耐磨机理。试验结果表明：在试验参数范围内,球磨材料为蛇纹石、球磨类型为湿磨、球磨时间为10h时,制备的气缸套强化层具有最佳减磨效果。在压强为40MPa、富油、高速条件下,摩擦副的最终温度为65℃,摩擦系数为0.07,磨损量为6.8mg。将结果与现有缸套材料的摩擦磨损试验进行对比分析,得出在富油条件下,其摩擦系数降低35%,磨损量降低至原来的1/3；而在贫油条件下,其摩擦系数降低15%,磨损量降低至原来的1/2；并测得经强化后的气缸套的表面显微硬度提高了约48%。更多还原

【Abstract】 This paper explores a new method—high-energy ball milling, to strengthen the surface of the cylinder, which can greatly improve the wear resistance and service life of cast iron cylinder liner by preparing micro and nano powder by ball mill after learning many other surface enhancing methods.In this study, the micro and nano powder of serpentine and SiC particles are prepared by the ball-milling, and the micro and nano material is impregnated on the inner-surface of the cylinder liner to harden the surface. Firstly, the basic parameters are determined according to the elastic-plastic contact theory proposed by Brizmer. Next, 12 cylinder liners of different materials, different ball-milling types and different milling time are prepared for the orthogonal factor by orthogonal test. In order to test the wear resistance of the cylinder, the performance of the cylinder under different lubricating conditions is analyzed by the friction and wear test, and the optimal solution is found out by optimizing the orthogonal factors. Finally, the mechanisms of hard impregnation and impregnation through soft channel are described theoretically by using scanning electron microscopy.The results of the test show that within the parameters’scope, the optimal wear-reducing result of the strengthened liner layer is achieved when the material is the serpentine, the milling type is wet, and the milling time is 10h. When the pressure is 40Mpa, under well-lubricated and high-speed condition, the final temperature of the friction pair is 65℃, the friction coefficient is 0.07 and the wear loss is 6.8mg. Compared with the original material, the result can be drawn that the friction coefficient could be reduced by 35%, and the wear loss could be reduced to 1/3 of the original under oil-rich condition; while, the friction coefficient could be reduced by 15%, and the wear loss could be reduced to 1/2 of the original under poor-lubricated condition. The microhardness of the liner surface is significantly increased approximately by 48% by strengthening.更多还原