Solid‐State Reaction Between Titanium Carbide and Titanium Metal


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The solid‐state reaction between titanium and titanium carbide to form substoichiometric titanium carbide was studied by annealing single‐crystal diffusion couples at T= 1350° to 1525°C. The thickness of the epitaxially grown carbide layer was almost an order of magnitude greater than that predicted from published values for chemical diffusion of carbon through titanium carbide. A value of 424 exp[–368 kJ/mol/RT] cm2/s is calculated for the chemical diffusivity of carbon from the diffusion‐couple data of the present study. This anomalously rapid diffusion of carbon is associated with short‐circuit diffusion along platelets of Ti2C which develop parallel to {111} planes in TiC during the reaction. The Ti2C platelets extend from the original Ti‐TiC interface to the moving reaction front and also grow from the original interface into the original carbide crystal.

Original languageEnglish (US)
Pages (from-to)305-310
Number of pages6
JournalJournal of the American Ceramic Society
Issue number5
StatePublished - May 1984

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