Silver Layer on AgW, AgMo and AgWC Electric Contacts for Circuit Breakers

摘要：

　　AgW, AgMo and AgWC powder metal composite contacts are commonly used in UL approved residential and commercial circuit breakers.Unacceptable contact resistance and temperature rise in closed contacts can develop after more than a few hundred switching cycles if contact material selection is not proper.It is a careful balance of contact material properties of weld resistance, contact erosion and switched contact interface resistance.To reduce surface resistance, there are methods to produce a functional silver layer of 5-25μm on the contact surface.This includes the processes such as (a) electrochemical etching of W, LT (Low Temperature);and (b) thermos chemical oxidation of W, LR (Low Resistance);and (c) Ag electroplating.The pros and cons of different ways to produce this silver layer are discussed and their implementation in production.

关键词： Silver refractory contact Circuit breaker Rsistance Heat rise Millivolt drop Silver layer

作者: Chi H.Leung

作者单位: Electric Contact Material Consultant Export, Pennsylvania, USA

会议类型: 国际会议

会议名称: The 7th Intrenational Conference on Reliability of Electrical Products and Electrical Contacts(第七届电工产品可靠性与电接触国际会议)

会议地点: 江苏苏州

会议语种:英文

页码: 7-12

在线出版日期: 2019-11-04（万方平台首次上网日期，不代表论文的发表时间）