STUDYING OPPORTUNITIES OF OPTIMIZATION METAL BOND DIAMOND TOOLS PRODUCTION TECHNOLOGY

Abstract

The technology for manufacturing diamond tools based on the method of two-stage free liquid-phase sintering of diamond-metal compacts developed previously by the authors was investigated. To study the possibilities of optimizing the manufacturing technology of diamond-metal composites by free sintering, a metal bond of the composition (wt.%) 51% Fe - 9% Ni - 32% Cu - 8% Sn was chosen. Studies of the physical-mechanical properties of pressed and sintered in an argon medium samples of sizes 40x5x6 mm were carried out, without prior sintering in a reducing medium and repeated cold pressing. In order to determine the optimal values of temperature and the duration of heat setting required to obtain sufficiently hard and strong samples sintered in a protective medium, we studied the effect of temperature and duration of sintering of samples obtained at various cold pressing pressures on the hardness and strength of the tool. The results of studies of the hardness and shear strength of composite materials 51Fe - 9Ni - 32Cu - 8Sn, obtained by the simplified technological scheme allow us to judge the possibilities of its application for the manufacture of diamond tools. We propose to increase the tool durability by metallizing with thermal diffusion saturation of diamond powders with titanium in a halogen-containing medium. It was found that using the optimized technology for the production of composite material 51% Fe - 9% Ni - 32% Cu - 8% Sn, which includes pressing a powder mixture and free liquid-phase sintering of preforms in a neutral medium, it is possible to obtain samples with sufficiently high physical and mechanical characteristics. Optimized technology can be recommended in the production of high-performance diamond tools.