The addition of lanthanum hexaboride to zirconium diboride for improved oxidation resistance

The oxidation resistance of ZrB2–SiC-based ultrahigh-temperature ceramic (UHTC) is remarkably enhanced by the addition of lanthanum hexaboride, which has demonstrated outstanding oxidation resistance to temperatures up to 2400 °C. The improved oxidation resistance is attributed to the formation of a coherent compact scale, which acts as an effective barrier against the inward diffusion of oxygen.