Electroexplosive electrical erosion resistant coatings of the Ag-W system used for electrical contacts of power mine equipment

International Scientific Conference "Knowledge-based technologies in development and utilization of mineral resources"

Romanov, D.A.^1 ; Moskovsky, S.V.^1 ; Gromov, V.E.^1 ; Sosnin, K.V.^1

Siberian State Industrial University, 42 Kirova street, Novokuznetsk

654007, Russia^1

关键词: Copper substrates;    Electrical conductivity;    Electrical contacts;    Electrical erosion;    Mechanical and physical properties;    Microhardness tests;    Submicrocrystalline structures;    Tungsten powders;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/206/1/012030/pdf
DOI  :  10.1088/1755-1315/206/1/012030

来源: IOP

【 摘 要 】

In this paper the coatings of the Ag-W system obtained by electroexplosive coating on copper electrical contacts of power mine equipment were studied. The modes of deposition and sample weights of silver and tungsten powders were chosen, metallographic research by the methods of light and atomic force microscopy, microhardness tests were carried out. The results of the tests show that the copper electrical contacts of KPV-604 controller have increased values of microhardness and are characterized by a submicrocrystalline structure based on tungsten and silver. The optimum mode of electroexplosive deposition is established at a voltage value 2.5 kV. In this mode, the coating layer has the greatest average microhardness value, in comparison with other investigated regimes. This value is 457.5 55.2 HV, which is 3.8 times higher than the average value of microhardness in the copper substrate. The analysis of the thin section roughness showed that the average roughness value of the coating is greater than the average roughness values of the substrate and the layer with the altered state by 50.015 nm and 22.849 nm, respectively. The coating of the Ag-W system on the copper contacts improves their mechanical and physical properties. The studied treatment modes make it possible to increase significantly the microhardness of the surface contact layer, as well as to increase their electroerosion resistance due to the presence of tungsten particles in the coating, and to maintain the necessary electrical conductivity, facilitated by the presence of silver.