Keyword: «carbides»

The structure, morphology and composition of the diamond-matrix interface of a composite diamond-containing material obtained by combining processes of the diamond grains metallization (chromium and iron) and the tungsten-cobalt matrix sintering impregnated with copper have been studied by scanning electron microscopy, X-ray microanalysis, X-ray phase analysis and Raman spectroscopy. The specific productivity of diamond dressing tools based on the obtained material has been determined. Diamond metallization with chromium and iron, cause the specific productivity of the tool increase by ~44–62% compared to the same indicator of a tool without diamond metallization.

In this paper, the processes of structure formation during gas-thermal electric arc metallization with powder wire are considered. The basic composition of the charge is nickel alloy PGSR-4. Niobium powders were selected as modifying additives, the content of which in the charge of powder wires is: 0.1%, 0.3%, 1% and 5% by weight. The influence of niobium content on carbide formation, on the ratio of structural components, on the formation of oxide phases, and the dispersion of the surfacing microstructure are shown. Tribological studies have shown that the wear of samples decreases by an order of magnitude, starting with the addition of 0.3% niobium. With a niobium content of 1% and 5% in the powder wire, the wear resistance remains high, but the mass losses of the samples and the counterbody are balanced, which is due to the grinding of the microstructure and an increase in the uniformity of micromechanical properties.