In order to avoid the transition ablation damage of the electromagnetic launch rail surface,the research on the rail surface protection was carried out.First of all,the current carrying friction ex-periment under extreme operating conditions was carried out using a pin-on-disc tester developed by the laboratory.Secondly,the characteristics of the transient temperature field during the experiment were analyzed by COMSOL.Finally,considering the use of high temperature resistant molybdenum coating on the surface of the disc sample,the temperature field distributions before and after treat-ment were simulated and compared.The results show that the high energy arc caused by the loss of contact is one of the main factors affecting the transient temperature field of sliding electrical contact,which can cause ablation pits up to 20 microns deep on the surface of untreated disc samples,that the surface temperature after molybdenum coating treatment is higher,and the maximum surface tempe-rature difference before and after treatment can reach hundreds of degrees Celsius,mainly because of the low thermal conductivity of molybdenum,and that high temperature resistance and thermal con-ductivity should be taken into account when selecting materials for rail surface treatment.The re-search results are of great significance for prolonging the service life of the rail.
关键词
电磁轨道发射/滑动电接触/瞬态温度场
Key words
electromagnetic rail launch/sliding electrical contact/transient temperature field
维普
万方数据