一、序随着现代工业的发展,尤其是航空技术和宇宙航行技术的日益发展,对接触材料的要求愈来愈高,航空和宇宙飞行中的通讯系统、电器仪表控制系统要求高度可靠地传递电能和精确的传递各种电讯号,这就要求其中的接触点可靠和精确地工作,对电接触元件的工作寿命的要求也愈来愈高,例如,有 First, the order With the development of modern industry, especially the increasing development of aviation technology and space navigation technology, the requirements for the contact materials are getting higher and higher, and the communication systems and the electronic instrument control systems in aviation and space flight require highly reliable transmission Electricity and accurate transmission of various signals, which require the contact point of reliable and accurate work, the working life of the electrical contact elements are also getting higher and higher requirements, for example, there is