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由于电弧效应,触头材料表层遭受极其严重的热作用,使表层材料的微观结构改变。触头的电气性能取决于材料的表面结构,因而有必要知道表层结构重新改组的机理。触头断面和表面龟裂区域用扫描电镜检查。模拟低压断路器的工作状况,在一套试验设备上对AgZnO、AgC、AgNi、AgSnO_2和AgCdO作了大电流(2000 A)分断试验。本文主要是讨论AgZnO材料。在单分2000 A或AC4型电寿命试验以后,我们即可探知材料的结构。同时,我们还能通过激光熔化或炉中熔化模拟电弧对表层的热作用,以便再现这个过程。利用这些试验结果,联系到材料的成分、粒度和物理、化学性能,我们便能解释材料结构的改变。这样,AgZnO的电气特性便可得到更好地了解。
Due to the arc effect, the surface of the contact material suffers extremely severe heat effects, which changes the microstructure of the surface material. The electrical properties of the contacts depend on the surface structure of the material, so it is necessary to know the mechanics of the reorganization of the surface structure. Contact cross-section and surface crack area using scanning electron microscopy. Simulated low-voltage circuit breaker working conditions, a set of test equipment for AgZnO, AgC, AgNi, AgSnO_2 and AgCdO made a large current (2000 A) breaking test. This article focuses on AgZnO materials. After a single 2000 A or AC4 electrical endurance test, we can ascertain the material’s structure. At the same time, we can reproduce this process by simulating the thermal effects of arcs on the surface by laser melting or furnace melting. Using these experimental results, we can explain the changes in the structure of the material in relation to the composition, particle size, and physical and chemical properties of the material. In this way, the electrical characteristics of AgZnO can be better understood.