The effect of various additives such as TiB 2 , HfB 2 , CrB 2 , TaB, TaSi 2 , LaB 6 , La 2 O 3 , and AlN on the oxidation behavior of ZrB 2 ‐based ultra‐high‐temperature ceramics (UHTCs) at 1800°C was investigated. The additions of CrB 2 and HfB 2 to the ZrB 2 –SiC composites have minor effect on the structure evolution of the oxide scale and oxidation resistance. However, all the other additives, especially for Ti and Ta compounds, have changed the oxidation mechanism resulting in a marked detrimental effect on the oxidation resistance of ZrB 2 ‐based UHTCs.
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Hu et al. (2009) studied this question.
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