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采用称量法研究了新型Cr21Ni35Nb Al钢分别在700℃、800℃和900℃空气中的静态氧化行为,并绘制其高温氧化动力学曲线。结合X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对高温氧化膜层的形貌及结构进行表征。结果表明:新合金的高温氧化动力学曲线遵循抛物线规律,700℃氧化膜主要为(Fe_(0.6)Cr_(0.4))_2O_3和少量Al_2O_3;800℃氧化膜较为复杂,主要为Al_2O_3、(Al_(0.9_C_(r0.1))_2O_3和少量Fe(Cr,Al)_2O_4;900℃时氧化膜主要为Al_2O_3和少量(Al_(0.9_C_(r0.1))_2O_3。
The static oxidation behavior of the new type Cr21Ni35Nb Al steel in air at 700 ℃, 800 ℃ and 900 ℃ was studied by using the weighing method, and its high temperature oxidation kinetics curve was drawn. The morphology and structure of high temperature oxide film were characterized by XRD, SEM and EDS. The results show that the oxidation kinetics curve of the new alloy obeys the parabolic law. The main oxide films at 700 ℃ are (Fe_ (0.6) Cr_ (0.4)) _2 O_3 and a small amount of Al_2O_3. The oxide films at 800 ℃ are more complex, mainly Al_2O_3, 0.9_C_ (r0.1)) _2O_3 and a small amount of Fe (Cr, Al) _2O_4. The main oxide films were Al 2 O 3 and a few Al_ (0.9_C_ (r0.1)) _ 2O_3 at 900 ℃.