เป็นเรื่องยากสำหรับโลหะบริสุทธิ์ชนิดเดียวที่จะตอบสนองความต้องการทั้งหมดได้หน้าสัมผัสทางไฟฟ้า. With the development of vacuum switch gear to large capacity, electrical contact materials have experienced the development process from single metal to binary and then to multicomponent composites. In different application occasions, the requirements for contact materials also have different degrees of emphasis. There are many contradictions between the electrical characteristics of contacts and the physical properties of materials;
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