Abstract A TiSi2–NbSi2 composite coating has been successfully prepared on Nb–Si based ultrahigh temperature alloys via firstly magnetron sputtering a Ti–5Al–10Nb–2Zr (at.%) thin film and then Si–Y co-deposition. The composite coating contains a TiSi2 outer layer, an NbSi2 inner layer and a thin transitional layer. The mass gain of the TiSi2–NbSi2 composite coating after oxidation at 1250 °C for 100 h is 2.7 mg/cm2, lower than that of the simple silicide coating (4.2 mg/cm2), because the addition of Zr in the coating promotes the formation of a denser and thinner glass-like scale and inhibits the severe outward diffusion of metal ions. The scratch tests show that the coating has bound with the substrate very tightly due to metallurgical bonding in the coating.

中文翻译：

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磁控溅射再填充胶结制备TiSi2-NbSi2复合涂层的氧化行为和附着性能

摘要 通过磁控溅射 Ti-5Al-10Nb-2Zr (at.%) 薄膜，然后 Si-Y 共沉积，在 Nb-Si 基超高温合金上成功制备了 TiSi2-NbSi2 复合涂层。复合涂层包含一个 TiSi2 外层、一个 NbSi2 内层和一个薄的过渡层。TiSi2-NbSi2 复合涂层在 1250 °C 氧化 100 h 后的质量增加为 2.7 mg/cm2，低于简单硅化物涂层（4.2 mg/cm2），因为在涂层中添加 Zr 促进了形成更致密和更薄的玻璃状鳞片，并抑制金属离子的严重向外扩散。划痕测试表明，由于涂层中的冶金结合，涂层与基材的结合非常紧密。