Bahan kontak awal dengan tungsten murni, aluminium murni dan tembaga murni dan perak, logam vakum mulia hampir semuanya menggunakan logam refraktori seperti w, mo, sebagai bahan kontak, bahan kontak semacam ini dengan serangkaian keuntungan, seperti halnya kapasitas yang baik, dan resistensi yang baik dan ketahanan terhadap koefisien perpindahan panas, dan perilaku yang baik, cairannya, dan ketahanan terhadap koefisien perpindahan panas, dan perilaku yang tepat, dan resistensi dari koefisien perpindahan panas, dan resistensi. etc., until now has been widely used in vacuum switch breaking small current. But high melting point of pure metal contact material has many shortcomings, such as breaking current and high level of river closure, limiting the use of vacuum switch. Started developing composite after contact, the present study is more low voltage electrical appliances silver based contact materials, double layer or multilayer Bahan kontak majemuk, sakelar vakum, tegangan tinggi dan sakelar tertutup lainnya dengan bahan kontak .
Foreign study of electrical contact element and material has a history of 78. At present foreign production and research and development of electrical contact materials company mainly AMI DODUCO (Germany), forthcoming OMC hair company (USA) Metalor company (glass), etc.In our country since 1956 in contact materials research and production, after nearly 50 years of development, the current domestic engaged in electrical contact materials production enterprises for more than 60 (means only members of the wga's electrical alloy), total about 12000 employees, assets of about 1.2 billion yuan, in more than 60 branch members, mostly private enterprises (about 90%), about 10 enterprises with certain scale and technical strength, the product variety, technical personnel and production equipment is complete, in terms of the varieties and properties of contact materials, The current international domestic all can produce the electric contact material variety, in general, can satisfy the demand of the electric switch,
The species is close to or reached the international advanced level. But the scale of production, technological level, product quality and so on, compared with the developed countries contact materials in our country is still there is a big gap. Mainly displays in: (1), enterprise scale is small, low℃of automation, product quality is often unstable. (2) materials in the form of contacts, wire, sheet, Nilai tambah pasokan produk terminal kecil . (3) Permintaan bahan baku dan ukuran kontrol dan pasca perawatan produk . (4) Perhatikan produksi, abaikan penelitian ilmiah
