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

N. I. Polushin, Head of the Scientific and Research Laboratory “Superhard materials”
A. I. Laptev, Leading Researcher of the Scientific and Research Laboratory “Superhard materials”, e-mail: laptev@misis.ru
E. M. Baragunov, Student

This article considers the testings, which were carried out for wear resistance of experimental diamond drill bits, made with application of 4 matrices of complex chemical composi tion: (WC – Co – Fe – Cu), (WC – Co – Fe – Cu – Ni), (WC – Cu + cast tungsten carbide (melted and crashed WC)), and (WC – Cu – Ni + cast tungsten carbide). There were used the synthetic diamond powders of SDB 1125 30/40 type, produced by the “Element six” company. The content of diamonds in the bits is 2,4·10^–4 kg, their concentration is 25%. The process of bits manufacturing was carried out by infiltration method, at the temperature of 1150 ^оC, during 15 min. The wear resistance testings were carried out when drilling the abrasive circles, granite and marble. During the research process, it was established, that, taking into account the influence on the silicon carbide abrasive circles, the most wear resistant is the tool, made with application of (WC – Cu – Ni + cast tungsten carbide) matrices. The microhardness of cast tungsten carbide is much higher than the microhardness of the main structure of matrix. The cast tungsten carbide is contained in the (WC – Cu – Ni + cast tungsten carbide) and (WC – Cu + cast tungsten carbide) matrices. According to this, the wear resistance of these matrices considerably exceeds the wear resistance of (WC – Co – Fe – Cu) and (WC – Co – Fe – Cu – Ni) matrices. Addition of nickel into the potting material improves the wear resistance of (WC – Сo – Fe – Cu) and (WC – Cu + cast tungsten carbide) matrices, at the expense of increasing in hardness. However, using the tool for working with marble and granite is not effectual, because increasing of wear resistance of matrix doesn't lead to increasing of wear resistance of diamond drill bits.

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