研究了0.8%La2O3-Mo5Si3/MoSi2复合材料在1200℃空气中的高温氧化行为.结果表明:0.8%稀土和Mo5Si3的加入,使材料的抗氧化性能降低.Mo5Si3含量越高,材料的抗氧化性能越差.当Mo5Si3含量低于30%时,在氧化初始阶段,质量变化呈直线下降,随着氧化的进行,氧化逐渐增重,材料表面形成较致密的SiO2阻止了材料的进一步氧化,使得氧化增重较小.而0.8%La2O3-40%Mo5Si3/MoSi2复合材料却出现了"粉化"现象.0.8%La2O3-Mo5Si3/MoSi2复合材料抗氧化性能的降低,归因于Mo5Si3差的抗氧化性和材料致密度的降低;另外,稀土和Mo5Si3的加入,细化了材料的晶粒,使晶界面积增加,加速了氧在晶界中的扩散,促进了材料的氧化.
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