| The arc erosion experiments are carried out by using test and control circuit manufactured for five kinds of silver-based contact materials ,AgZnO(10), AgSnO2(8.5)In2O3(4), AgCdO(12), AgNi(lO), AgC(5), frequently used in switching apparatus ,then micro-analysis experiments are done through SEM with EDAX analyzer. According to the experienced results ,the electrical lifes of the five kinds of contact materials under different conditions when they are paired are symmetrically are analyzed and studied base on the loss of quality and extent of cracks, Secondly the electrical lifes of contact material under the same conditions are compared when they are paired asymmetrically. This will guide the selection of contact materials used in switching apparatus.Thirdly, fuzzy comprehension judgement program is compiled with C language, the electri- cal life of five kinds of materials are judged and ordered, the order of the electrical life of five kinds of contact materials from long to short is AgCdO(12)>AgNi(10)>AgSnO2 (8)In2O3(4) >AgZnO(10)>AgC(5) (CJ10-2CK 50A); AgCdO(12)> (8)In2O3(4) >AgNi(10) >AgZnO(10) >AgC(5) (CJ10-2(K 100 A). The judgement results are basically coincided with experimental results, this is a new method of predicting the electrical life of switching apparatus.Based on the electrical contact theory and achievements we have found,a slide board materials of copper-based powder metallurgy with double lubricating structure used in electrical locomotive is made,also it shows high performance at Dazhun Railway. |
PDF Full Text Request