Abstract The growing popularity of ultra-high-temperature ceramics inspired us to prepare Hf-based ceramic fibres by sequential melt hand-drawing, ultraviolet (UV) crosslinking, and pyrolysis of a novel polymeric precursor synthesised by co-polymerisation of HfCl4, ethylenediamine, and allylamine. The above precursor featured a backbone comprising Hf–N and CH=CH groups and exhibited good melt spin ability due to having a relatively linear-chain structure, an optimal molecular weight (Mn = 2569 g/mol), and a suitable softening point (135–155 °C), being easily melt-drawn into green fibres (diameter = 25 µm) and exhibiting a high ceramic yield of 46.38 wt% at 1500 °C. UV curing of green fibres at room temperature and their subsequent pyrolysis in an inert atmosphere at 1200 and 1600 °C afforded Hf-based ceramic fibres (diameter = 13 µm), indicating the great potential of the above precursor and the prepared ceramic fibres for ceramic matrix composites used in high-temperature applications.

中文翻译：

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一种新型 HfC 陶瓷单源前驱体的合成及其制备 Hf 基陶瓷纤维的可行性

摘要 超高温陶瓷的日益普及促使我们通过连续熔融手绘、紫外 (UV) 交联和热解制备 Hf 基陶瓷纤维，该前体由 HfCl4、乙二胺、和烯丙胺。上述前驱体的主链包含 Hf–N 和 CH=CH 基团，由于具有相对线性的链结构、最佳分子量 (Mn = 2569 g/mol) 和合适的软化点，因此表现出良好的熔体纺丝能力 ( 135–155 °C），很容易被熔拉成绿色纤维（直径 = 25 µm），在 1500 °C 下的陶瓷产率为 46.38 wt%。在室温下对绿色纤维进行 UV 固化，然后在 1200 和 1600 °C 的惰性气氛中进行热解，得到 Hf 基陶瓷纤维（直径 = 13 µm），