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

摘要

The oxidation resistance of ZrB_2-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 deg 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.