Determination of the wear mechanism of the diamond tool matrix by analysis of wear particles

Purpose. Determining the contact zone of microindentors from the rock side with the surface of a non-diamond element based on the Ni-Sn system (6 wt%) and in comparison with the contact zone of the specified microindentors with the surface of a similar bond of a diamond-containing element, under dynamic loading. Methodology. To select the wear products of the experimental element material, made by resistive electro-sintering and the core of abrasive sandstone as a result of short-term contact between their surfaces, the tests were performed on a stand created on the basis of the screw-cutting lathe ДІП–200 according to the parameters of technological conditions that simulate the drilling process. The sludge suspension was selected and examined using a ZEISS EVO 50 XVP scanning electron microscope with an Oxford Instruments Ultim Max energy dispersive X-ray analyser. Also, the worn surface of the diamond-free element was subjected to microscopic examination using Lomo Metam R-1 microscopes with a Digital KOCOM CCD video camera and Bausch & Lomb, mod. Gemolite. Findings. The result of the study involves the determination of the direct point of contact between the microindenter on the rock side and the surface of the non-diamond element in the wear particle. The point of direct contact of the specified counterbodies has the form of an elliptical groove, which is the epicenter of the formation of a system of microcracks. The morphometric identity of the wear particles of the studied element and the diamond tool bond indicates the similarity of one of the mechanisms of microindentation from the side of the rock. Originality. Determination of one of the sources of damage to the working surface of the diamond tool element opens up prospects in the study of all stages of the bond wear mechanism depending on changes in its chemical composition or technological parameters of the tool use. Practical value. Determination of the chemical and morphometric features of the wear particles of the diamond tool bond will allow assessing its wear resistance and developing wear resistance criteria, which is reflected in the saving of resources.