FORMING OF COATINGS OF NANO-, SUBMICRO- AND MICRO- POWDERS OF CUBIC BORON NITRIDE (CBN) ON THE SURFACE OF GRAINS OF SYNTHETIC DIAMOND GRINDING POWDERS OF INCREASED STRENGTH FOR GRINDING TOOLS. STUDY OF THESE GRINDING POWDERS BY METHODS OF SCANNING ELECTRO

Abstract

The research objective is to develop and improve the technology for forming a coating of nano-, submicro- and micropowders of cubic boron nitride (cBN) on the surface of grains of synthetic diamond grinding powders of increased strength for grinding tools and to study these grinding powders using scanning electron microscopy and microanalysis, IR spectroscopy, and X-ray spectral analysis. 

Experimental studies of the process of applying a polycomponent coating to synthetic diamond grinding powders during the crystallization of soluble components from a solution (liquid-phase coating method) were conducted in order to develop and improve the basic technology for forming a coating of cBN. In total, 12 variants of samples of synthetic diamond grinding powders of increased strength (AC 15, AC 20, grain size 125/100, 160/125) were created and investigated - initial and coated with nano-, sub-micro- and micropowders of cBN with various binders of different chemical composition (boron oxide (B2O3), sodium silicate (Na2SiO3), polyvinyl alcohol, polyvinyl butyral phenol formaldehyde, hydrolyzed collagen) in various combinations. It was established that coating with KM nano (cBN nanopowder) reduces the wear of diamond grinding wheels by three times, and with KM 3/2 (cBN micropowder) - by half. Such an improved diamond grinding tool can be used in the machining of new materials currently used in mechanical and aircraft engineering, the production of manned and unmanned (drone) equipment.