Silicide coatings have proven to be promising for improving the high-temperature oxidation resistance of niobium alloy. However, the long-term protective property of single silicide coating remains a long-time endeavor due to the deficiency of oxygen-consuming phases, as well as the self-healing ability of the protective layer. Herein, a silicide-based composite coating is constructed on niobium alloy by incorporation of nano-SiC particles for enhancing the high-temperature oxidation resistance. Isothermal oxidation results at 1250 °C for 50 h indicate that NbSi/NbO-SiO/SiC multilayer coated sample with a low mass gain of 2.49 mg/cm shows an improved oxidation resistance compared with NbSi coating (6.49 mg/cm). The enhanced high-temperature antioxidant performance of NbSi/NbO-SiO/SiC multilayer coating is mainly attributed to the formation of the protective SiO self-healing film and the high-temperature diffusion behavior of NbSi/substrate.

中文翻译：

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1250°C 高温氧化行为：铌合金的新型多层改性硅化物涂层设计策略


硅化物涂层已被证明有望提高铌合金的高温抗氧化性。然而，由于耗氧相的缺乏以及保护层的自修复能力的不足，单一硅化物涂层的长期保护性能仍然是一个长期的努力。在此，通过掺入纳米SiC颗粒在铌合金上构建硅化物基复合涂层，以增强高温抗氧化性。 1250 °C 50 h 等温氧化结果表明，与 NbSi 涂层（6.49 mg/cm）相比，质量增益低至 2.49 mg/cm 的 NbSi/NbO-SiO/SiC 多层涂层样品显示出更高的抗氧化性。 NbSi/NbO-SiO/SiC多层涂层增强的高温抗氧化性能主要归因于保护性SiO自修复膜的形成以及NbSi/基体的高温扩散行为。