【摘要】 为了搞清煤对矿山机器的磨损作用及磨损机制,用不同碳含量的钢在改装的M-200磨损试验机上进行了原煤、浮选煤和煤中加不同石英砂含量的三体磨料磨损试验。结果表明:当煤和材料的硬度比H_a/H_m大于0.64时,造成材料的硬磨料磨损,但煤的磨料磨损机制同其他磨料不同。煤粒的磨料磨损特性是在其磨损过程中发生某些弹塑性变形,使材料以犁沟—塑变—最终造成材料的断裂而磨失。其过程类似于塑性金属的一般断裂机理,而直接的显微切削现象甚少。煤中的石英含量增加使材料的磨损率增大,磨损率和煤中的自由石英含量呈线性比例关系。更多还原

【Abstract】 In order to understand the abrasiveness of coal to mining machinery and its mechanism, abrasive wear tests have been made in a modified M-200 tester with steel of different carbon contents, using mining run coal, float coal and coal with different quartz contents as abrasives. The results show that when hardness ratio of coal to material, H_a/H_m, is greater than 0.64, the material experiences hard abrasive wear. However, the abrasive mechanism of coal is different from that of other abrasives, in that elasto-plastic deformation of coal grains takes place and causes the removal of material in the way of plowing-plastic squashing and flatteningcracking, which is similar to fracturing mechanism of plastic metals, little direct micro-cutting phenomenon occurs. The wear rate of materials is linearly proportional to quartz content in coal.更多还原