铌及铌硅化合物具有优良的力学性能,可替代现有的镍基合金超高温材料.通常,这类材料的高温抗氧化性能较差,铌在高于350℃时即发生剧烈氧化,而抗氧化性能较好的NbSi2在1000K附近也会出现"pest"现象.铌硅化物的氧化行为与钼(或钨)硅化物存在很大区别,其氧化产物无挥发性.通过增加硅的含量,或添加钛、铝、铬等元素,涂敷高温抗氧化涂层等,可有效提高铌及铌硅化合物的高温抗氧化能力.
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