Interaction of Titanium Carbonitrides, Oxocarbides,
and Oxonitrides with Concentrated Mineral Acids

V. A. Zhilyaev and A. P. Shtin

Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences,
Pervomaiskaya ul. 91, Yekaterinburg, 620219 Russia

Received November 21, 2002

Abstract—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 behav-
ior of TiC_xN_y, TiC_xO_y, and TiN_xO_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 elec-
tronic structure of cubic (NaCl-type) ternary refractory interstitial phases while considering the redox processes
that accompany their dissolution. The chemical durability of TiC_xN_y, TiC_xO_y, and TiN_xO_y in concentrated min-
eral acids is controlled by the metallicity of 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.

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