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蒸汽中的氧含量对Alloy263氧化行为的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.19.017, PP. 4991-4996

Keywords: 263合金,蒸汽氧化,氧化层,TiO2,氧含量

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Abstract:

研究了蒸汽中的氧含量对263合金蒸汽氧化行为的影响。结果表明:263合金在750℃2种氧含量(1.125×10-6%和3×10-4%)的蒸汽中氧化后生成的氧化层横截面微观形貌相近,均由连续均匀的Cr2O3?TiO2?(Mn,Fe,Cr)3O4外氧化层和沿晶界和亚晶界呈网状分布的Al2O3?TiO2内氧化物组成。蒸汽的氧含量增加可使氧化层中的TiO2和(Mn,Fe,Cr)3O4含量明显降低。在低氧含量(1.125×10-6%)蒸汽中生成的氧化层中TiO2以大颗粒状态存在,而在高氧含量(3×10-4%)蒸汽中生成的氧化层中TiO2和Cr2O3无法从形态上区分。2种氧含量的蒸汽氧化试验中均未出现铬挥发所致的灾害性氧化。

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