FEATURES OF THE TECHNOLOGICAL PROCESS OF FORMING A PROTECTIVE COATING FROM MICRO-, SUBMICRO AND NANOPOWDERS OF CUBIC BORON NITRIDE ON THE SURFACE OF GRAINS OF HIGH-STRENGTH SYNTHETIC DIAMOND GRINDING POWDERS

Abstract

The target of the study is to create a multi- component combined heat-resistant and wear-resistant coating on grains of high-strength synthetic diamond grinding powders made of micro-, submicro- and nanopowders of cubic boron nitride and substances with increased adhesive properties – inorganic and organic – in order to improve the performance of the tool. The coating is formed by liquid-phase application during crystallization or compaction of solution components from a combined solution-suspension.

A basic technology for applying protective coatings from micro-, submicro- and nanopowders of cubic boron nitride on the surface of grains of high-strength synthetic diamond grinding powders has been developed. The coating composition includes KM 3/2  /  KM 0.5/0  /  KM nano and boron oxide (B₂O₃), sodium silicate (Na2SiO3), polyvinyl alcohol, polyvinyl butyral phenol formaldehyde, hydrolyzed collagen in various combinations.

The heat resistance of the studied samples of grinding powders – original and with an applied coating – was determined.

It was ascertained that abrasive powders with a coating of this type can be used in grinding tools, in particular, in grinding wheels.