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NANOSTRUCTURED SINTERED METAL ELECTRICAL CONTACTS TYPES, PRODUCTION TECHNOLOGIES, PROPERTIES AND APPLICATION
B. Aprahamian, V. Zaharieva, M. Nikolova
Abstract: Cast silver contacts are used in relay technology where the commutated current is in units of amperes. The search for more wear resistant materials is to a great extent connected with the investigation of silver based composites containing inclusions of refractory metals, oxides and other thermodynamically stable compounds. An important aspect of research on contact materials concerns the search for new efficient methods of making composite electrical contacts as alternatives to the classical method of single pressing and sintering. Composites containing additions of electrically conductive and wear and corrosion resistant intermetallic compound particles can exhibit a high level of contact properties. The paper considers two groups of sintered metal contact bodies - monolithic nanostructured cermets (types Ag-Ni3Ti, Mo-Cu, Mo-Co-Cu and others) and nanostructured multilayer coatings of the type Ti/TiN/Ti/TiN/Ti/TiN, coated on Ag-CdO contact bodies of electrical contacts. The main methods for obtaining sintered metal contact bodies are discussed. Attention is paid to some of its properties: microhardness, cyclic wear resistance of an electric spark. For some of the contacts the topography and microstructure are investigated.
Keywords: composite materials; cyclic wear resistance; electrical contacts; nanostructured cermets; nanostructured multilayer coatings