DEPENDENCE OF THE SINGLE CRISTAL SYNTHETIC DIAMONDS TYPE IIa WITH OCTAHEDRAL HABIT STATIC STRENGTH ON THEIR SIZE

Abstract

The method of coaxial compression was used to determine the static strength of single crystals synthetic diamond type IIa with a size of 2 - 2.5 mm, grown by spontaneous crystallization at high pressures and temperatures. The original single crystals for strength testing were pre-sorted and classified by size and shape, as well as subjected to magnetic separation to collect samples with a minimum amount of solvent metal inclusions in order to ensure uniform structural characteristics. To determine the value of static strength, a special manipulator has been developed, which made it possible to test samples of synthetic diamond single crystals under uniaxial compression with forces up to 50 kN. The dependence of the static strength on the crystal size is obtained. These data allowed us to conclude that the use of structurally perfect type IIa single crystals is promising for use as cutting elements in various types of drilling and single-chip tools.