论文部分内容阅读
通过X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)等手段对不同Si含量的铁基高温合金1 250℃下的抗氧化性能进行了研究。结果表明,1 250℃下,铁基高温合金抗氧化性能与Si含量的关系由优至劣的顺序是:0.93%Si>0%Si>2.76%Si>1.40%Si。含0.93%Si的铁基高温合金具有好的抗氧化性能的原因是,Si在基体与其致密的氧化膜之间形成了弥散分布的SiO_2颗粒层,这些尺寸较小的SiO_2颗粒与其氧化膜紧密连接犹如楔子般起着钉扎氧化膜的作用,改善了氧化膜的粘附性,进而提高了材料的抗氧化性能。
The oxidation resistance of iron-based superalloy with different Si contents at 1 250 ℃ was studied by XRD, SEM and EDS. The results show that the optimal order of the relationship between the oxidation resistance and the Si content of iron-based superalloy at 1 250 ℃ is: 0.93% Si> 0% Si> 2.76% Si> 1.40% Si. The reason why the iron-based superalloy containing 0.93% Si has good oxidation resistance is that Si forms a dispersed SiO 2 particle layer between the substrate and its dense oxide film, and these smaller SiO 2 particles are in close contact with the oxide film Like a wedge-shaped pinning oxide film to improve the adhesion of the oxide film, thereby enhancing the oxidation resistance of the material.