X10CrAlSi18 FHSS (ferritic heat-resistant stainless steel) has received a lot of attention due to its advantageous combination of creep resistance and oxidation resistance. The influence of Si content on the high-temperature oxidation resistance of X10CrAlSi18 FHSS after oxidation at 700 and 800 °C for up to 180 h in air was investigated in this study. According to the results, a higher Si content could coarsen the grain of ferrite and simultaneously increased the amount of (Cr, Fe)₂₃C₆ carbides, which caused cracks and reduced the adhesion between the oxide film and the matrix. After oxidation at 700 °C, the oxide film of 0.77Si FHSS and 1.35Si FHSS were found to be primarily composed of Al₂O₃, SiO₂, Cr₂O₃, Fe₂O₃, Mn₂O₃ and MnCr₂O₄, with thickness of 5.10 μm and 5.56 μm, respectively. The oxide films formed at 800 °C were primarily composed of Al₂O₃, SiO₂, Cr₂O₃, FeCr₂O₄, Mn₂O₃ and MnCr₂O₄ with thickness of 5.55 μm and 7.37 μm, respectively. A higher Si content was discovered to increase the amount of MnCr₂O₄ in the outer layer of the oxide film, which resulted in a looser spinel structure and reduced the oxidation resistance of X10CrAlSi18 FHSS.

X10CrAlSi18 FHSS（铁素体耐热不锈钢）因其抗蠕变性和抗氧化性的优势组合而受到广泛关注。本研究研究了 Si 含量对 X10CrAlSi18 FHSS 在 700 和 800 °C 下在空气中氧化长达 180 小时后的高温抗氧化性的影响。结果表明，较高的Si含量会使铁素体晶粒粗化，同时增加(Cr，Fe) ₂₃ C ₆碳化物的含量，从而引起裂纹并降低氧化膜与基体之间的附着力。在 700 °C 氧化后，发现 0.77Si FHSS 和 1.35Si FHSS 的氧化膜主要由 Al ₂ O ₃、SiO ₂、Cr 组成₂ O ₃、Fe ₂ O ₃、Mn ₂ O ₃和MnCr ₂ O ₄，厚度分别为5.10μm和5.56μm。800℃下形成的氧化膜主要由Al ₂ O ₃、SiO ₂、Cr ₂ O ₃、FeCr ₂ O ₄、Mn ₂ O ₃和MnCr ₂ O _{4 组成}，厚度分别为5.55μm和7.37μm。发现较高的 Si 含量会增加 MnCr ₂ O ₄的量 X10CrAlSi18 FHSS 的外层氧化膜，导致尖晶石结构松散，降低抗氧化性能。