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首页> 外文会议>Electrical Contacts, 1993., Proceedings of the Thirty-Ninth IEEE Holm Conference on >The effects of nickel on the switching performance of silver-tungsten-based contacts
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The effects of nickel on the switching performance of silver-tungsten-based contacts

机译：镍对银钨基触点开关性能的影响

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Silver-tungsten-based contacts are commonly used in air circuit breakers. The most common contact-related problems for devices using this type of material are high contact resistance, i.e. high temperature rise in a device, and catastrophic material erosion (cracking). This paper describes how the addition of nickel affects the erosion characteristics of the base silver-tungsten material. It is shown that a multiphase tungstenickel structure can form on the contact surface resulting in high contact resistance. The silver remains more cohesively adherent to the tungsten phase when the nickel is present. The multiphase structure which forms appears to be more resistant to thermal stress cracking. Negative effects of the nickel addition are the reduced high temperature stability of the contact material and the potential for high contact resistance if contact is made directly with the multiphase tungsten-nickel material. Two surface structure conditions which can cause high contact resistance without the presence of oxides are described.
机译：基于银-钨的触头通常用于空气断路器中。对于使用这种材料的设备，最常见的与接触有关的问题是高接触电阻，即设备中的高温升高，以及灾难性的材料腐蚀（破裂）。本文介绍了镍的添加如何影响基础银钨材料的腐蚀特性。已经表明，在接触表面上可以形成多相钨/镍结构，从而导致高的接触电阻。当存在镍时，银与钨相保持更内聚的粘附性。形成的多相结构似乎更抗热应力开裂。镍添加的负面影响是接触材料的高温稳定性降低，如果直接与多相钨镍材料进行接触，则可能会产生高接触电阻。描述了两个表面结构条件，它们可以在不存在氧化物的情况下引起高接触电阻。

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