期刊
CERAMICS INTERNATIONAL
卷 44, 期 6, 页码 7305-7309出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.01.066
关键词
Ultra-high-temperature ceramics; Precursor; HfC; Fibres
资金
- National Natural Science Foundation of China [51403233]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- National University of Defense Technology
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 (M-n= 2569 g/mol), and a suitable softening point (135-155 degrees C), being easily melt-drawn into green fibres (diameter = 25 pm) and exhibiting a high ceramic yield of 46.38 wt% at 1500 degrees C. UV curing of green fibres at room temperature and their subsequent pyrolysis in an inert atmosphere at 1200 and 1600 degrees C afforded Hf-based ceramic fibres (diameter = 13 pm), indicating the great potential of the above precursor and the prepared ceramic fibres for ceramic matrix composites used in high temperature applications.
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