Open AccessStructure and Electrical Erosion Resistance of An Electro-Explosive Coating of the ZnO-Ag System
Author(s) -
Д. А. Романов,
Stanislav V. Moskovskii,
К. В. Соснин
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/582/1/012006
Subject(s) - materials science , explosive material , coating , scanning electron microscope , electrical resistance and conductance , composite material , electrical contacts , electrical resistivity and conductivity , erosion , metallurgy , chemistry , paleontology , organic chemistry , electrical engineering , biology , engineering
For the first time, electroerosion-resistant coatings of the ZnO-Ag system were obtained by electro-explosive spraying. The coating structure was investigated by atomic force microscopy and scanning electron microscopy. The formed coating is a homogeneous composite material consisting of a silver matrix and ZnO inclusions located in it. Tests of sprayed coatings for electrical erosion resistance under arc erosion conditions were carried out. A formation mechanism of hierarchical levels of the structure of electro-explosive coatings was 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 zinc oxide, the dependence of electrical contact resistance on the number of on/off cycles in the process of testing for electrical erosion resistance is substantiated.