不同铜含量浸金属碳滑板的载流摩擦磨损性能

为研究不同铜含量的浸金属碳滑块的载流摩擦磨损性能,在环-块试验机上研究3种不同铜含量(铜质量分数分别为1.17%、27.8%、50.45%)浸金属碳滑板与铜银合金接触线在载流条件下的摩擦磨损性能,并比较不同电流情况下的材料磨损表面形貌的变化。结果表明:铜含量对浸金属碳碳滑板的摩擦磨损性能有不同的影响。其中铜质量分数为1.17%的材料在200 A小电流情况下整体磨耗量较小,但是在400 A大电流情况下,电弧热、焦耳热产生的500℃左右高温会导致材料气化、掉块,严重加剧材料的损耗;铜质量分数为50.45%的材料在小电流情况下磨耗最大,但材料的运行温度整体较低,即材料的散热性能较好;铜质量分数为27.8%的材料在小电流与大电流情况下综合磨损性能最好。与铜银合金线对磨时,铜含量较高的材料出现了较为明显的黏着磨损,铜含量越高的材料其黏着磨损现象越明显。

Study of Current-carrying Friction and Wear Behaviors of Different Copper Content Impregnated-Metals Carbon Strip

In order to study the current carrying friction and wear properties of impregnated-metal carbon stripmetal impregnated carbon slide with different copper content,the friction and wear properties of three kinds of metal impregnated carbon slide with different copper content(mass fractionof copper is 1.17%,27.8%and 50.45%respectively)and copper silver alloy contact wire under current carrying conditions were studied on a ring block tester,and the changes of wear surface morphology under different current were compared.The results show that the copper content in the contact strips has a certain effect on the friction and wear performance of the contact strips.The overall abrasion loss of the material with copper mass fraction of 1.17%is relatively small under the condition of 200 A low current,but under the condition of 400 A high current,the high temperature of about 500℃generated by arc heat and Joule heat will lead to the vaporization and block falling of the strip material,which will seriously aggravate the material wear loss.The material with copper mass fraction of 50.45%has the largest abrasion loss under the condition of low current,but the overall operating temperature of the material is lower,that is,the material has better heat dissipation performance.The material with copper mass fraction of 27.8%has the best comprehensive wear performance under the condition of low current and high current.The materials with high copper content show relatively obvious adhesive wear,the higher the copper content of the material,the more obvious the adhesive wear phenomenon.