Character of wear of synthetic diamonds differentstrength in impregnated drill bits

Abstract

The aim of the work was to study the effect of the strength characteristics of synthetic diamonds on the nature of their wear during the destruction ofrock and the wear resistance of impregnated drill bits. The influence of temperature effects on synthetic diamond crystals was studied by the method oftheir strengthevaluating under uniaxial compression before and after the heat treatment at the temperature ofthe rock tool production . The effect of the thermal resistance of diamonds on the wear resistance of impregnated drill bits was studied when drilling rocks under conditions close to production ones. The wear pattern of individual parts of the working surface of the crown and the surface of diamond grains after drilling was examined with a Zeiss EVO 50 scanning electron microscope.
It has been established that the wear resistance of drill bits increases with an increase in the thermal strength of diamonds. For high-strength heat-resistant diamonds, the most protruding from the matrix and effectively destroying the rock, it is characteristic to microslide their faces and separate the microfragments of the scaly species. The latter can be caused by high temperature stresses on the surface of diamonds with direct contact with the rock during its destruction. The advantages of using high-strength heat-resistant diamonds in drill bits aimed to improve their performance are shown