摘要
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+Ti O2+(Mn,Fe,Cr)3O4外氧化层和沿晶界和亚晶界呈网状分布的Al2O3+Ti O2内氧化物组成。蒸汽的氧含量增加可使氧化层中的T i O2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Ti O2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Ti O2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。
The effect of the oxygen content in the steam on the oxidation behavior of alloy 263 has been investigated. The results reveal that the oxide scales of alloy 263 in steam with two oxygen contents （1.125 × 10-6% and 3 × 10-4%） at 750 ℃ were composed of a continuous external layer and an internal subscale. The external scales were essentially composed of Cr2O3, TiO2 and （Mn,Fe,Cr）304, but the internal oxide, was mainly Al2O3 and TiO2. It was revealed that a higher oxygen content in the steam tends to reduce the volume fraction of TiO2 and （Mn,Fe,Cr）304 in the scale. The TiO2 blocks were distinct on the scale in steam with a low oxygen content （1.125× 10-6%）. However the TiO2 and Cr2O3 couldn＇t be distinguished according to the morphology in the scale in steam with a high oxygen content （3 × 10-4%）. Breakaway oxidation caused by reactive evaporation of Cr2O3 in the presence of O2 and H2O was not observed in the oxidation tests.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第19期4991-4996,共6页
Proceedings of the CSEE
基金
国家高技术研究发展计划(863计划)(2012AA050501)
国家能源应用技术研究及工程示范项目(NY20110102-1)~~
