Corrosion Resistance of Ultrahigh-Temperature Zirconium Boride Ceramics under Concentrated Solar Radiation

Abstract

The behavior of ZrB₂–MoSi₂(SiC) and ZrB₂–SiC–ZrSi₂ ceramics under concentrated solar radiation is examined. The effect of zirconium silicide and molybdenum silicide impurities on the formation of protective oxide layers on the ultrahigh-temperature ceramics in air at elevated temperatures is studied with the purpose of controlled development of dense protective film ensuring high service characteristics. The structure and composition of the oxidized materials are analyzed. The highest corrosion resistance is shown by the ZrB₂–MoSi₂ ceramics.