用静态增重法测定了铸造镍基高温合金K447在700℃~950℃空气中的恒温氧化行为,其氧化动力学符合抛物线规律.在900℃以下为完全抗氧化级,在900℃~950℃为抗氧化级.X射线衍射、扫描电镜和能谱分析表明,K447氧化膜分为3层:外层是疏松的Cr2O3和TiO2的混合物,并含有少量的NiO及NiCr2O4尖晶石;中间层是Cr2O3;内氧化物层是Al2O3,并含有少量TiN.
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