Investigation of Finemet nanocrystalline alloy coating obtained by the electric spark method

Study of the composition of innovative materials for the restoration and strengthening of machine parts

“…The presence of Nb and Zr atoms in the 5BDSR nanocrystalline structures that slow down diffusion will help to reduce the rate of crystal growth in reducing coatings. The Nb and B atoms repelled from the cluster will contribute to the formation of stable local-order regions in its vicinity, and thus stop the growth of the α-Fe(Si) crystal [7][8][9]. Thus, the presence of these elements in the reducing coatings will increase the dispersion and compensate for the action of Cu atoms.…”

“…Amorphous and nanocrystalline alloys often have such mutually exclusive properties [1][2][3][4][5]. With their help, it is possible to obtain strengthening coatings with amorphous or nanocrystalline structures that have high physical and mechanical properties and wear resistance [6][7][8].…”

Surface Characteristics, Properties and Wear Resistance OF TIB2 BASED Hard-Alloy Coatings Obtained by Electrospark Deposition at Negative Polarity on Ti6Al4V Alloy

“…The result is the formation of a thin surface layer with a supercooled (modified) structure [12], with a new relief and different surface properties from the original ones, which are controlled by the electrical and physical parameters of the mode and composition of the electrode material [9,10,[13][14][15][16][17][18]. This allows for obtaining fundamentally new materials and structures, including nanostructural effects, which cannot be obtained under conventional metallurgical conditions [9][10][11][12]15,[17][18][19][20][21].…”

“…A specific phenomenon in ESD of titanium surfaces is the initial erosion of titanium substrates and the formation of relatively deep craters on the coated surface [13,14], and as a result -the appearance of structural defects of coatings-relatively high roughness and the presence of irregularities and micropores in the surface layer. It is possible to reduce these defects in various ways -by using an inert environment, coating electrodes of graphite and certain metals and alloys, by additional laser and other treatments [13,14,15,18,20], but they complicate the technology and the deposition process, increasing the time and cost of deposition. The easiest way to reduce the surface defects is to reduce the single pulse energy (current, capacitance and pulse duration) [15][16][17][18].…”

“…This results in fewer surface defects and lower roughness, but also lower thickness and less amount of wear-resistant phases and compounds in the coating composition. The use of lower energy with an extremely short duration of electrical pulses -10 -6 -10 -5 s, however, creates conditions for the formation of a higher amount of amorphous and nanostructured phases in the composition of coatings, which, according to many authors [17][18][19][20][21], favorably affects their wear and corrosion resistance.…”