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The isothermal oxidation of the 200 face of HfC and TiC single crystals was carried out at 700 to 1500°C and at oxygen pressures of 0.08 to 80 kPa for up to 20 h. The oxide scale on the HfC crystal was found to consist of almost compact and pore-free black scale (zone 1) and white/gray scale containing many pores (zone 2) . Zone 1 contained about unoxidized 25 at. % carbon and zone 2 6 to 11 at. % carbon. Oxidation of TiC produced a characteristic scale composed of inner dense lamella subscale with black and gray alternate strips (zone 1) and an outer region with laminations separated by pores and cracks (zone 2) . The carbon content in the inner scale ranged from 7 (1300•‹C) to 23 at. % (1500•‹C) . The structure and morphology of carbon films obtained from zone 1 by the treatment of the oxidized HfC by HF solution was characterized by Raman spectroscopy and transmission electron microscopy (TEM) . Alloying of carbon formed by oxidation of the carbides (HfC, TiC, ZrC) was suggested on the basis of tentative C-Me-O nonequilibrium reaction path diagram.

Deposition and Characterization of Carbon at the Interface by Oxidation of Single Crystals of Carbides (HfC, ZrC, TiC)