Tungsten fiber-reinforced tungsten (W_f/W) composites are being developed to improve the intrinsic brittleness of tungsten. In these composites, engineered fiber/matrix interfaces are crucial in order to realize toughening mechanisms. For such a purpose, yttria (Y₂O₃), being one of the suitable interface materials, could be realized through different coating techniques. In this study, the deposition of thin films of yttria on a 150 µm tungsten wire by physical and chemical vapor deposition (PVD and CVD) techniques is comparatively investigated. Although fabrication of yttria is feasible through both CVD and PVD routes, certain coating conditions such as temperature, growth rate, oxidation of W_f, etc., decide the qualitative nature of a coating to a particular extent. In the case of PVD, the oxidation of W_f is highly reduced compared to the WO₃ formation in high-temperature CVD coating processes. Yttria-coated tungsten fibers are examined comprehensively to characterize their microstructure, phase, and chemical composition using SEM, XRD, and Raman spectroscopy techniques, respectively.

中文翻译：

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用于钨纤维增强复合材料的氧化钇涂层钨纤维：PVD 与 CVD 路线的比较研究

正在开发钨纤维增强钨 (W _f / W) 复合材料以改善钨的固有脆性。在这些复合材料中，工程纤维/基质界面对于实现增韧机制至关重要。为此，氧化钇 (Y ₂ O ₃ ) 作为合适的界面材料之一，可以通过不同的涂层技术实现。在这项研究中，比较研究了通过物理和化学气相沉积（PVD 和 CVD）技术在 150 µm 钨丝上沉积氧化钇薄膜。尽管通过 CVD 和 PVD ​​途径制造氧化钇是可行的，但某些涂层条件如温度、生长速率、W _{f 的}氧化等，在特定程度上决定了涂层的定性。在 PVD ​​的情况下，与高温 CVD 涂层工艺中的 WO ₃形成相比，W _f的氧化大大减少。分别使用 SEM、XRD 和拉曼光谱技术对氧化钇涂层钨纤维进行了全面检查，以表征其微观结构、相和化学成分。