HIGH PRESSURE HIGH TEMPERATURE CONSOLIDATION OF DIAMOND POWDER WITH TITANIUM COATING

Abstract

At a pressure of 7.7 GPa, the temperature dependence and compaction kinetics of diamond powder synthesized in the Mg–Zn–B–C system with a titanium coating on the diamond surface were investigated. The coating on the surface of the diamond grains was carried out by the method of gas transport movement of the metal in the gaseous medium of halides. Sintering was carried out in a high-pressure apparatus of the "toroid" type, the sintering temperature varied from 1300 to 1850 oС. It was established that the titanium coating on the surface of the diamond grains significantly affects the sintering process, intensifying the densification process in the initial period, and also reduces the sintering temperature, at which the maximum level of densification is reached, from 1800 to 1450 ^oС. The study of the structure and elemental composition of the obtained samples of the diamond composite material showed that it was possible to obtain a uniform distribution of titanium in the volume of the sample. A framework of large diamond grains is present in the homogeneous structure of the samples.