Abstract The oxidation behavior of a Ti5Si3-incorporated MoSiBTiC alloy (38Mo–30Ti–17Si–10C–5B, at.%) was systematically studied in the temperature range of 700–1000 °C. Temperature dependence of oxidation kinetics and oxide scale formation was revealed for this alloy. The oxidation kinetics at 700 °C featured an initial transient stage of weight gain and then switched to weight loss. At 800 °C, the oxidation kinetics featured an initial transient stage with fast weight loss, a steady stage with small weight loss, and an acceleration stage leading to catastrophic failure. At 900 and 1000 °C, the alloy exhibited a rapid transient weight loss as followed by a decreased weight loss fitting to parabolic kinetics. The scales that formed at 700–1000 °C mainly consisted of rutile TiO2 and amorphous SiO2. The high viscosity of SiO2 at 700 and 800 °C caused the formation of porous and microcracked oxide scales while the occurrence of viscous flow during oxidation at 900–1000 °C promoted the formation of dense and protective scales.

中文翻译：

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掺有 Ti5Si3 的 MoSiBTiC 合金的高温氧化行为

摘要 系统研究了掺有 Ti5Si3 的 MoSiBTiC 合金（38Mo–30Ti–17Si–10C–5B，at.%）在 700–1000 °C 温度范围内的氧化行为。揭示了该合金的氧化动力学和氧化皮形成的温度依赖性。700 °C 下的氧化动力学具有初始的增重过渡阶段，然后转为减重。在 800 °C 时，氧化动力学具有快速失重的初始瞬态阶段、失重较小的稳定阶段和导致灾难性故障的加速阶段。在 900 和 1000 °C 时，合金表现出快速的瞬时失重，随后是符合抛物线动力学的失重降低。在 700-1000 °C 形成的鳞片主要由金红石 TiO2 和无定形 SiO2 组成。