Structure and phase composition of composite detonation coatings based on TiCrB2 and ZrB2

Abstract

The detonation method is used to deposit TiCrB 2 -FeCr and (AlN-ZrB 2 -ZrSi 2 )-NiCr composite coatings on steel 45. The structure, microstructure, and morphology of the starting powders and detonation coatings are studied. Based on the distribution of elements and microhardness at the coating-substrate interface, the formation of the coatings is analyzed. It is shown that a transition zone forms at the coating-substrate interface due to mutual mass transfer. This zone promotes strong adhesion and gradual decrease in microhardness toward the substrate. High-temperature corrosion-resistant chromites and mullites, which can serve as a solid lubricant, form in the system containing a solid-phase multicomponent phase (AlN, ZrB 2 , ZrSi 2 ). The coatings are thus expected to have excellent tribotechnical properties.