摘要
目的针对活塞环在高温高压、循环往复的惯性力等工况下与气缸极易磨损的问题,以栓盘模型为试验对象,研究圆形微织构对铜基自润滑复合材料的摩擦磨损性能,以期提高两者的耐磨损性能。明确微织构在不同工况下与复合材料摩擦磨损行为之间的联系,建立表面微织构设计准则。方法采用CT-MF20型光纤雕刻激光打标机在45#钢表面加工制备出直径为0.2 mm的圆形微织构,并通过栓-盘形式在HT-1000型摩擦磨损试验机上对圆形织构化45#钢进行摩擦性能试验,考察圆形微织构在不同载荷(2、10、20N)及不同滑动距离(1.88 m和18.84 m)下的摩擦磨损情况,而且借助扫描电子显微镜(SEM)分析摩擦表面的显微结构和形貌,通过能谱仪(EDS)结果分析摩擦表面元素积累情况。此外,为了与之形成对比每组均设有无织构的45#钢试验。结果在摩擦试验中,载荷为20 N、滑动距离为18.84 m时圆形织构的摩擦磨损性能最优,平均摩擦因数降幅随着滑动距离的增加从11%增加到23.5%,同时栓和盘表面形貌磨损也明显比其他条件的试件要小。在EDS结果中发现圆形织构表面的氧元素更多,集中分布在织构里。结论当载荷为20 N、滑动距离为18.84 m时,圆形织构的减摩效果最好,摩擦因数稳定,栓盘磨损表面变得光滑,这归因于圆形织构盘表面棘轮效应明显,并形成连续稳定的转移润滑膜,从而减小磨损。
When the piston ring is in a high temperature and high pressure,inertia force of cycle repeats and other working conditions,between the piston ring and the cylinder will be extremely easy to wear the problem.As a result,in this paper,the frictional wear performance of circular micro-texture on copper-based self-lubricating composites is investigated by using a pin-disc model as the test object,with a view to improving the wear resistance of both.And to clarify the connection between the micro-texture structure under different working conditions and the frictional wear behavior of the composite material,while establishing design guidelines for the surface micro-texture structure.The test method applied in this paper is introduced as follows.Circular micro-texture structure with diameter of 0.2 mm is processed and prepared on the surface of 45#steel using CT-MF20 fiber engraving laser marking machine,then the friction performance of 45#steel with circular micro-texture is tested on HT-1000 friction and wear testing machine in the form of pin-disc contact.This test is conducted to examine the frictional wear of circular micro-texture under different loads(2,10 and 20 N)and different sliding distances(1.88 m and 18.84 m)working conditions,including the results of the analysis of the variation of the friction coefficient and wear volume.The microstructure and morphology of the friction surface is analyzed by scanning electron microscopy(SEM),which includes the analysis of such elements as the degree of wear of abrasive marks on the surface of pins and discs,the phenomenon of plastic flow delamination,wear chips and material transfer.As well as,the accumulation of elements on the friction surface is examined by energy spectrometer(EDS)results,mainly to examine the accumulation phenomenon of oxygen elements.In addition,in order to contrast with the previous group,each group is provided with a 45 steel test of non-microtexture.In the friction test,it is found that the frictional wear performance of the circular micro-tex
作者
马文林
未亮亮
MA Wen-lin;WEI Liang-liang(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2023年第1期93-102,共10页
Surface Technology
基金
国家自然科学基金(51765029)。
关键词
圆形
微织构
自润滑复合材料
摩擦磨损
摩擦因数
转移润滑
circular
micro-texture
self-lubricating composites
friction and wear
friction coefficient
transfer lubrication
