Electric-spark alloying of structural alloys with a composite based on TiCN-AIN

Globular structure of electrospark-deposited coatings on VK8 alloy

“…In case of VK8 alloy, cobalt and W-Co solid solution, which results from the WC dissociation caused by spark discharge, are such components [7]. Wetting of the electroerosion products of the alloying electrode with the substrate metal components has dominant impact on the globule composition and formation [3]: the lower the selectivity of wetting, the higher the phase and structural homogeneity of the electrospark-deposited coating. In this regard, the absence of globules on TBSAN/VK8 may result from some difference in the contact angles of the alloying components wetted by the substrate melt.…”

“…At the same time, the main phases of alloying electrodes in coatings alloyed with TBSAN and TsBSAN are revealed by x-ray diffraction (XRD) [6]. The coatings have also substantially different structures and tribotechnical characteristics when they are alloyed with the same electrodes of other materials: steel, titanium, and aluminum alloys [3,4].…”

“…Electrospark-deposited coatings have heterophase discrete structure. In a number of cases, the structure may consist of separate globules that alternate with areas of modified substrate surface [3,4,6]. The paper [6] examines the doping of hard VK8 alloy with AlN-TiB 2 and AlN-ZrB 2 electrode materials that have similar properties such as fine heterophase structure (grain size 2-3 μm), evenly distributed nitride and boride components, low porosity (~3%), and identical strength characteristics [3].…”

“…Electrospark alloying (ESA) has received much scientific attention recently: fundamentally new compositions of electrode materials have been developed [1][2][3][4] and potential expansion of ESA applications has been examined, including those for improving the wear resistance of cutting faces of hard-alloy tools [4][5][6]. Electrospark-deposited coatings have heterophase discrete structure.…”

Effect of electrospark alloying on the wear resistance of cutting inserts made of VK8 alloy

“…The technique is characterized by low energy intensity and high material utilization and permits local coating of cutting edges. It was demonstrated in [15][16][17] that electrosparkdeposited TiCN-AlN coating enhanced the heat and wear resistance and the friction coefficient of VK8 hard-alloy cutting tools.…”