采用真空非自耗电弧炉制备了Nb-22Ti-12Si三元以及三种不同V,Al含量的Nb.Ti-Si-V-Al五元Nb-Si合金,研究了四种合金铸态显微组织和1250℃的抗氧化性能.结果表明:V,Al的加入促进了反应Nb3Si→Nb Nb+Nb5Si3,使合金相组成由Nb +Nb3Si转变成为Nb +Nb5Si3,从而增加了合金中Nb相体积分数;合金的抗氧化性能随V,Al含量的增加而提高;V,Al的加入使合金氧化皮结构发生了转变,生成了较为致密的氧化皮,降低了合金的氧化速率,减少了合金氧化皮的剥落和金属氧化损失量.Nb-21.9 Ti-11.9Si-4.4V-4.1Al经过1250℃/50h氧化后金属损失厚度仅为0.1mm.
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