Field assisted sintering technology (FAST) is one of the potential methods to fabricate tungsten fiber reinforced tungsten (W/W) composites. The microstructure and mechanical properties of W/W composites are closely related to the sintering parameters. In the present work, the W/W composites with a YO coating on the fiber (W/YO/W) were fabricated via a FAST process and the microstructure was characterized. The influence of the heating rate and YO coating on the microstructure of W/YO/W composites was discussed in detail. It is observed that the YO coating can get damaged and move into the adjacent matrix. A higher heating rate (100 ℃/min) causes more serious damage on the YO coating which could be attributed to the higher electric current intensity. The samples produced with a lower heating rate (50 ℃/min) or with a thicker YO coating (3 µm) show an interface with better continuity. In addition, the integrity of the YO coating could by protected by an additional W-coating produced by chemical vapor deposition (CVD).

中文翻译：

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场辅助烧结加热速率和Y2O3涂层对Wf/Y2O3/W复合材料微观结构的影响

场辅助烧结技术（FAST）是制造钨纤维增强钨（W/W）复合材料的潜在方法之一。W/W复合材料的微观结构和力学性能与烧结参数密切相关。在目前的工作中，通过 FAST 工艺制造了纤维上带有 YO 涂层的 W/W 复合材料 (W/YO/W)，并对其微观结构进行了表征。详细讨论了加热速率和YO涂层对W/YO/W复合材料微观结构的影响。据观察，YO 涂层可能会受损并移动到相邻的基体中。较高的加热速率（100℃/min）会对YO涂层造成更严重的损伤，这可能是由于较高的电流强度所致。采用较低加热速率（50 ℃/min）或具有较厚 YO 涂层（3 µm）生产的样品显示出具有更好连续性的界面。此外，YO涂层的完整性可以通过化学气相沉积（CVD）产生的额外W涂层来保护。