RESEARCH OF THERMAL INFLUENCE ON THE CHANGE OF THE SURFACE LAYER OF DIAMONDS AND ASSOCIATED TOOL MATERIALS (REVIEW)

Abstract

Attention is drawn to the fact that the issues of effective processing of such fragile, difficult-to-process materials as mono- and polycrystalline diamonds are currently being discussed in the literature, including CVD diamond films, sapphire, etc. For the most part, such processing is faced with the issues of thermal impact on the surface of the tool material, taking into account the defects of the diamonds that undergo processing, directed impact on the surface of such diamonds, heat and modification of the surface of diamonds and accompanying tool materials.
 In this review, attention is focused on the newest modern developments, namely 2023, in the features of thermal effects on carbon materials, diamond, and steel. Studies are shown in the direction of directed changes in the surface of diamonds: obtaining the surface of OH-diamonds and H-diamonds, doping diamond, and changing the contact of the diamond surface with Fe and W. Special attention is paid to the application of various protective coatings on the surface of diamonds and related tool materials (steels, ceramics and hard alloys). At the same time, the greatest attention is paid to metal and nitride coatings, that is, this direction has recently become important and relevant.
 Various models of doped diamond, places of adsorption of O atoms on its various surfaces, and the subsequent process of the reaction of the O2 molecule with the C atom are considered. The results show that the multi-alloy diamond model has the highest activation energy, which reflects the best properties of oxidation resistance. Research shows that diamond with a rough surface has a larger surface area and higher electronegativity than normal diamond, which improves the adhesion between the Ni-based bond and the diamond with a rough surface.