Abstract

The paper presents the physicochemical corrosion process of composite TiN - TiB₂ ceramics in the mode of pulsed laser irradiation in the atmosphere. It has been established that as a result of the development of high-temperature oxidation TiN and TiB₂ processes and partial dissociation of these compounds the crater on the surface is formed. Oxidation processes lead to the formation of TiN_x, TiB, TiO₂, B₂O₃ and N2, whereas dissociation yields in Ti, B and N2, correspondingly. The gas and vapor products (B₂O₃ and N2) and part of the TiO₂ melt in the form of droplets are removed away from the crater. Such compounds as TiN_x, TiB and TiO₂ are enriched the surface of the crater walls.

Keywords: TiN - TiB₂ ceramics; Laser pulse irradiation; Phase transformation