物理化学学报 >> 2003, Vol. 19 >> Issue (11): 1039-1043.doi: 10.3866/PKU.WHXB20031111

研究论文 上一篇    下一篇

耐高温碳化硅纤维的制备与性能

李佑稷;曹峰;田宏现;李效东;余煜玺   

  1. 吉首大学化学系，吉首　416000；国防科技大学航天与材料工程学院,陶瓷纤维及其复合材料国防科技重点实验室,长沙　410073
  • 收稿日期:2003-05-06 修回日期:2003-07-08 发布日期:2003-11-15
  • 通讯作者: 李佑稷 E-mail:fcao@china.com

The Preparation and Properties of High Temperature Resistant SiC(Al) Fibers

Li You-Ji;Cao Feng;Tian Hong-Xian;Li Xiao-Dong;Yu Yu-Xi   

  1. Department of Chemistry, Jishou University, Jishou　416000; Key Laboratory of Ceramic Fiber and Composites, National University of Defence Technology, Changsha　410073
  • Received:2003-05-06 Revised:2003-07-08 Published:2003-11-15
  • Contact: Li You-Ji E-mail:fcao@china.com

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摘要： 采用聚硅碳硅烷（PSCS）与乙酰丙酮铝反应，合成出聚铝碳硅烷（PACS）陶瓷先驱体聚合物.经熔融纺丝、空气不熔化、烧成与高温烧结等工艺， 制备性能优异的耐高温碳化硅纤维SiC(Al).经29Si MAS NMR、 XRD、 Raman谱、AES与SEM等一系列分析表明，该纤维的化学组成和结构与普通碳化硅纤维显著不同，具有近化学计量比组成，氧、游离碳以及SixCyOz相的含量大大低于普通碳化硅纤维，这是其高温稳定的主要原因.在制备过程中铝作为烧结助剂起到了使纤维致密化与抑制晶粒快速增长的作用.

关键词: 聚铝碳硅烷, 耐高温碳化硅纤维, 性能

Abstract: In order to prepare high temperature resistant SiC fibers, polyaluminocarbosilane (PACS)was synthesized by reaction of polysilacarbosilane (PSCS) with Al(AcAc)3 (AcAc: acetylacetonate). Through melting spinning of PACS, air-curing, ceramination at 1300 ℃ and sintering at 1800 ℃ SiC(Al) ceramic fibers with high temperature resistance were obtained. 29Si MAS-NMR, AES, XRD, Raman spectra and SEM suggested that the composition of SiC(Al) fibers is close to stoichiometric ratio with much lower content of oxygen, free carbon and SixCyOz phase than that of common SiC fibers resulted in a character of high temperature resistance. In addition, densification and crystalline inhabitation by aluminum are crucial to the high temperature resistance of SiC(Al) fibers.

Key words: Polyaluminumcarbosilane, High temperature resistant SiC fibers, 　Properties