JSC “Terekalmaz”, Terek, Russia:

Kh. Z. Dzamikhov, Engineer

A. B. Tleuzhev, Chief Executive Officer

National University of Science and Technology “MISiS”, Moscow, Russia:

N. I. Polushin, Head of Scientific-Research Laboratory “Superhard materials”

M. N. Sorokin, Senior Researcher of Scientific-Research Laboratory “Superhard materials”, e-mail: sorokin@misis.ru

There was investigated the possibility of manufacturing of diamond-slitting wheel bundles, used in cutting of marble with various strength properties, by combination of the known matrix materials based on copper (V24), cobalt (BD126) and iron (HDR). Diamond-free and diamond containing segments were manufactured by hot pressing in graphite molds. The obtained samples were investigated by metallographic, microprobe and X-ray analysis methods; their hardness, microhardness, abrasion resistance, density, porosity and bending strength were measured by standard methods. The studies found that metallic bundles for diamond-slitting wheels with different mechanical properties may be manufactured by combination of standard matrix materials. The bundles, obtained by combination of matrix materials V24 + BD126 consist of solid solution of Cu, α-Co and β-Co. The bundles, obtained by combination of matrix compositions NDR + WC + V24, consist of a solid solution of Cu, WC and intermetallic Cu_13.7Sn, Fe₄Co and Co₃Fe₇. Study of strength properties of diamond containing bundle segments found the following peculiarities: diamond introduction in bundles V24 + BD126 leads to their strength reduction due to additional stress concentrators; diamond introduction in bundle NDR + WC + V24 does not reduce the bundle strength due to a large number of tungsten carbide grains. Studying of fractures of diamond containing segments defined that the break nature is on a bundle, wherein the diamond grains do not break down.

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14. ISO 4499-1:2008. Splavy tverdye. Metallograficheskoe opredelenie mikrostruktury. Chast 1. Mikrofotosnimki i opisanie (ISO 4499-1:2008. Hardmetals. Metallographic determination of microstructure. Part 1: Photomicrographs and description). (in Russian)