Cu-Cr合金电极触头板铸件的熔制

含０．４％～１．０％Ｃｒ的Ｃｕ－Ｃｒ合金具有优良的导电、导热性能，铸件经热处理强化后可获得较高的综合力学性能。近年来该合金作为一种新材料被广泛地用于制作电子工业、电器设备上的电极触头板、接触环、夹持体等零件。Ｃｕ－Ｃｒ合金存在易氧化吸气、凝固范围窄、收缩较大、易形成集中缩孔等缺陷，这些铸造特性给生产优良的Ｃｕ－Ｃｒ合金铸件带来一定的困难。以采用常规的熔炼设备和造型材料熔铸出Ｃｕ－Ｃｒ合金铸件——高压大电流电极触头板为例讨论这一熔铸的工艺方法。

电极触头钎焊连接研究进展

电极触头是使电器导电相互接通形成回路的关键元件,其性能好坏直接影响着电器的可靠性、稳定性、耐蚀性和易加工等机械性能。由于对开关电器小型化、长寿命和工作可靠性要求的不断提高,对电极触头的连接研究也越来越受到广泛地关注。本文综述了电极触头钎焊连接研究现状及进展,主要从火焰钎焊、炉中钎焊、感应钎焊和电阻钎焊等四个方面进行介绍。

大电流电极触头的真空钎焊工艺

针对大电流电极触头的焊接特点,确定了合理的真空钎焊的焊接工艺参数。分析了真空钎焊加热温度、升温速度、保温时间和真空度等工艺参数对钎焊质量的影响保证了产品的钎焊质量。产品的成功钎焊打破了同类进口产品的垄断。

Material transfer behavior of AgTiB_2 contact under different contact forces and electrode gaps

To disclose the effect of contact force and electrode gap on the material transfer behavior of Ag-based contact material, arc-erosion tests of the Ag-4wt.%TiB2 contact material were performed for 5000 operations at 24 V/16 A under resistive load on an electric contact material testing system. The arc energy and arc duration were investigated, the surface morphologies of eroded anode and cathode were characterized, the mass changes after arc-erosion tests were determined, and the material transfer behavior was discussed as well. The results show that contact force has a significant effect on the arc energy, arc duration and erosion morphology, but has no impact on the material transfer mode. However, electrode gap not only influences the arc energy, arc duration and surface morphology, but also changes the material transfer mode. At 1 mm, the material transfers from anode to cathode. Nevertheless, an opposite mode presents at 4 mm, which is from cathode to anode.