On the Structure and Electrical Erosion Resistance of the Electroexplosive Spraying of a ZnO–Ag-System Coating

Autor: Denis A. Romanov, Viktor E. Gromov, S. V. Moskovskii, K. V. Sosnin, A. D. Filyakov
Rok vydání: 2020
Předmět:
Zdroj: Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 14:944-950
ISSN: 1819-7094
1027-4510
DOI: 10.1134/s102745102005016x
Popis: For the first time, electrical erosion-resistant coatings of the ZnO–Ag system are obtained by electroexplosive spraying. The coating structure is investigated by atomic force microscopy and scanning electron microscopy. The formed coating is a structurally homogeneous composite material consisting of a silver matrix and ZnO inclusions located in it. Surface periodic structures with an average wavelength of 3 nm are found at the coating/substrate interface. Tests of the sprayed coatings for electrical erosion resistance under arc erosion conditions are carried out. A formation mechanism of hierarchical levels of the structure of the electroexplosive coatings is suggested. The mechanism is based on theoretical concepts of the formation and evolution of fractal aggregates with diffusion-limited and cluster-cluster aggregations. Based on the electrical properties of silver and copper oxide, a dependence of the electrical-contact resistance on the number of on/off cycles in the process of testing for electrical erosion resistance is substantiated.
Databáze: OpenAIRE
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