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Method for preparing boron-modified silicon nitride fiber
The invention discloses a method for preparing boron-modified silicon nitride fiber. The method comprises the following steps: firstly, preparing high-activity Si-N fiber from polycarbosilane non-molten fiber in a conversion manner, performing chemical introduction of an element B through HF removal reaction between B-F compounds generated through pyrolysis of redundant N-H in the high-activity Si-N fiber and a borofluoride compound, and nitriding in an ammonia gas, thus preparing the boron-modified silicon nitride fiber. Compared with the prior art, the method disclosed by the invention has the advantage that the prepared boron-modified silicon nitride fiber is relatively high in boron content, relatively high in nitrogen content and relatively high in fiber strength. The method disclosed by the invention is simple and convenient in process, low in cost and applicable to large-scale production, and a conventional decarbonization-nitridation system does not need any transformation.
Method for preparing boron-modified silicon nitride fiber
The invention discloses a method for preparing boron-modified silicon nitride fiber. The method comprises the following steps: firstly, preparing high-activity Si-N fiber from polycarbosilane non-molten fiber in a conversion manner, performing chemical introduction of an element B through HF removal reaction between B-F compounds generated through pyrolysis of redundant N-H in the high-activity Si-N fiber and a borofluoride compound, and nitriding in an ammonia gas, thus preparing the boron-modified silicon nitride fiber. Compared with the prior art, the method disclosed by the invention has the advantage that the prepared boron-modified silicon nitride fiber is relatively high in boron content, relatively high in nitrogen content and relatively high in fiber strength. The method disclosed by the invention is simple and convenient in process, low in cost and applicable to large-scale production, and a conventional decarbonization-nitridation system does not need any transformation.
Method for preparing boron-modified silicon nitride fiber
XIE ZHENGFANG (author) / WANG JUN (author) / SHAO CHANGWEI (author) / SONG YONGCAI (author) / WANG HAO (author) / JIAN KE (author)
2015-09-02
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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