STUDYING THE INFLUENCE OF THE INITIAL DIAMOND RAW MATERIALS PROPERTIES ON THE POLYCRYSTALLINE DIAMOND MATERIALS PROPERTIES
Abstract
Diamond polycrystals (PCD) are obtained from various diamond micropowders by impregnation with cobalt - tungsten carbide eutectic at high pressures and temperatures. Sintering was carried out in a high-pressure chamber (HPC) of the "toroid" type with a hole diameter of 39 mm with the following parameters: pressure 5.5-6 GPa, temperature ̴ 1450 °С on a uniaxial compression plant based on a press with a force of 25000 kN. Diamond micro powders with a grain size of 20/14 microns were used as the initial rough diamonds according to GOST 9206-80, obtained by crushing from various rough diamonds with subsequent separation by grain size. The first batch of powders was obtained from medium-strength grades АС 15 – АС 50, the second from low-strength grades АС 4 - АС 6, and the third from natural diamond powders. The results of metallographic studies of thin sections and chips of PCD, which make it possible to determine the features of their microstructure, are given, X-ray phase studies are carried out. In the impregnated diamond layer, the formation of tungsten carbide W2C was found, possibly formed during the decomposition of the initial tungsten carbide WC with the predominant formation of diamond from it under experimental conditions. The wear resistance, microhardness, and density of the obtained diamond poly crystals have been investigated. It has been established that the properties of the initial rough diamonds have the greatest effect on the wear resistance of the obtained polycrystalline diamond materials. This fact must be taken into account when developing polycrystalline diamonds for instrumental purposes. The observed relatively low wear resistance of PCD made from natural diamond powders can be explained both by the morphology of the initial particles and their lower ability to recrystallize at high pressures and temperatures.
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