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Preparation method of boron-doped silicon nitride fiber
Disclosed is a preparation method of a boron-doped silicon nitride fiber. The preparation method comprises: preparing a high-activity Si-N fiber by adopting conversion of a dis-molten polycarbosilane fiber; realizing chemical introduction of the B element by utilizing HX elimination reaction between spare N-H in the high-activity Si-N fiber and borazine containing a B-X (X=H, Cl, Br, and I) bond; and performing nitridation in ammonia gas to prepare the boron-doped silicon nitride fiber. Compared with the prior art, the boron-doped silicon nitride fiber prepared through the method in the invention is relatively high in boron content, nitrogen content, and fiber strength, and is uniform in dispersion. According to the invention, the technology is simple; the cost is low; and no change is needed in a current decarburization-nitridation system, so that the preparation method is suitable for mass production.
Preparation method of boron-doped silicon nitride fiber
Disclosed is a preparation method of a boron-doped silicon nitride fiber. The preparation method comprises: preparing a high-activity Si-N fiber by adopting conversion of a dis-molten polycarbosilane fiber; realizing chemical introduction of the B element by utilizing HX elimination reaction between spare N-H in the high-activity Si-N fiber and borazine containing a B-X (X=H, Cl, Br, and I) bond; and performing nitridation in ammonia gas to prepare the boron-doped silicon nitride fiber. Compared with the prior art, the boron-doped silicon nitride fiber prepared through the method in the invention is relatively high in boron content, nitrogen content, and fiber strength, and is uniform in dispersion. According to the invention, the technology is simple; the cost is low; and no change is needed in a current decarburization-nitridation system, so that the preparation method is suitable for mass production.
Preparation method of boron-doped silicon nitride fiber
XIE ZHENGFANG (author) / WANG JUN (author) / SHAO CHANGWEI (author) / SONG YONGCAI (author) / WANG HAO (author) / JIAN KE (author)
2015-09-09
Patent
Electronic Resource
English
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