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Method for preparing silicon carbide fiber through high-softening-point polycarbosilane
The invention provides a method for preparing silicon carbide fiber through high-softening-point polycarbosilane. The method includes the following steps that 1. low-molecular-weight polycarbosilane is mixed with organosilane containing vinyl or silazane compound containing the vinyl, the polymerization reaction is catalyzed through hydrosilylation or spinning-class polycarbosilane is precipitated or classified, and high-softening-point polycarbosilane is obtained; 2. melt spinning is conducted on the high-softening-point polycarbosilane, and continuous polycarbosilane fiber is obtained; 3. the continuous polycarbosilane is placed in the non-oxidative activity atmosphere to be subjected to non-melting treatment, and polycarbosilane non-melting fiber is obtained; 4. the polycarbosilane non-melting fiber is subjected to hard fire again after being subjected to hard fire or pyrolysis decarburization, and the low-oxygen-content silicon carbide fiber or near-stoichiometric silicon carbide fiber is obtained. The method is simple in process, low in investment and preparation cost and suitable for industrialization batch preparation; the oxygen content of the obtained low-oxygen-content silicon carbide fiber is smaller than or equal to 1.2 wt%, the near-stoichiometric silicon carbide fiber C/Si ranges from 1 to 1.07, and the mechanical property is excellent.
Method for preparing silicon carbide fiber through high-softening-point polycarbosilane
The invention provides a method for preparing silicon carbide fiber through high-softening-point polycarbosilane. The method includes the following steps that 1. low-molecular-weight polycarbosilane is mixed with organosilane containing vinyl or silazane compound containing the vinyl, the polymerization reaction is catalyzed through hydrosilylation or spinning-class polycarbosilane is precipitated or classified, and high-softening-point polycarbosilane is obtained; 2. melt spinning is conducted on the high-softening-point polycarbosilane, and continuous polycarbosilane fiber is obtained; 3. the continuous polycarbosilane is placed in the non-oxidative activity atmosphere to be subjected to non-melting treatment, and polycarbosilane non-melting fiber is obtained; 4. the polycarbosilane non-melting fiber is subjected to hard fire again after being subjected to hard fire or pyrolysis decarburization, and the low-oxygen-content silicon carbide fiber or near-stoichiometric silicon carbide fiber is obtained. The method is simple in process, low in investment and preparation cost and suitable for industrialization batch preparation; the oxygen content of the obtained low-oxygen-content silicon carbide fiber is smaller than or equal to 1.2 wt%, the near-stoichiometric silicon carbide fiber C/Si ranges from 1 to 1.07, and the mechanical property is excellent.
Method for preparing silicon carbide fiber through high-softening-point polycarbosilane
SONG YONGCAI (author) / LI YONGQIANG (author) / GOU YANZI (author) / WANG XIAOZHOU (author) / JIAN KE (author) / WANG JUN (author)
2015-04-22
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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