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Interaction of titanium carbonitrides, oxocarbides, and oxonitrides with concentrated mineral acids

The basic features of the interaction between powdered titanium carbonitrides, oxocarbides, and oxonitrides and concentrated hydrochloric, sulfuric, and nitric acids have been studied. The dissolution behavior of TiC x N y , TiC x O y , and TiN x O y has been determined as a function of their composition, and the schemes of the chemical reactions involved have been proposed. The correlations found are discussed in terms of the electronic structure of cubic (NaCl-type) ternary refractory interstitial phases while considering the redox processes that accompany their dissolution. The chemical durability of TiC x N y , TiC x O y , and TiN x O y in concentrated mineral acids is controlled by the metallicity oi Ti-Ti bonds and depends on the kind of, and ratios between, non-metal atoms in the compounds and the passivation ability of solid products produced.