Abstract—Ultrahigh temperature composite materials HfB2–SiC containing 25, 35, and 45 vol % SiC were produced by spark plasma sintering. Modeling of heating under the action of a dissociated air flow for selected samples using a VGU4 induction plasma generator showed that these materials do not degrade even while keeping at a surface temperature of more than 2000°C (up to 2600°C) for 11 min. A combination of optical microscopy, scanning electron microscopy (with EDX analysis), and Xray computed microtomography were used for investigating the microstructure and composition of the oxidized layer before and after heating.

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