The paper presents the physicochemical corrosion process of composite TiN -TiB 2 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 TiB 2 processes and partial dissociation of these compounds the crater on the surface is formed. Oxidation processes lead to the formation of TiN x , TiB, TiO 2 , B 2 O 3 and N 2 , whereas dissociation yields in Ti, B and N 2 , correspondingly. The gas and vapor products (B 2 O 3 and N2) and part of the TiO 2 melt in the form of droplets are removed away from the crater. Such compounds as TiN x , TiB and TiO 2 are enriched the surface of the crater walls.
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