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Preparation method of SiBN fiber
The invention relates to a preparation method of SiBN fiber. The preparation method comprises the following steps: (1) preparing a high-activity Si-N fiber, namely adding an infusible polycarbosilane fiber into a decarburization-nitridation system, carrying out vacuumizing, replacing gas in the decarburization-nitridation system by virtue of nitrogen or argon until reaching an atmospheric pressure state, and repeating for at least three times; introducing high-purity ammonia gas, heating to 500 DEG C within 2 hours, after the temperature is increased to 700 DEG C at the speed of 0.90 DEG C/min-0.95DEG C/min, maintaining the temperature for 0.5 hour, heating until the temperature is 800-1200 DEG C at the speed of 100 DEG C/h, and maintaining the temeprature for 1-2 hours; introducing nitrogen/argon to cool to the room temperature, so as to obtain the high-activity Si-N fiber; (2) boronizing the high-activity Si-N fiber, namely heating until the temperature is 400-450 DEG C within 2 hours, introducing borane compound gas at least containing one B-H bond into the system, reacting for 24-36 hours, and introducing nitrogen/argon to cool to the room temperature; and (3) nitriding a boronized fiber, namely introducing high-purity ammonia gas, heating until the temperature is 1300-1400 DEG C within 6 hours, and maintaining the temperature for 1-2 hours; introducing nitrogen/argon to cool to the room temperature, so as to obtain the SiBN fiber. The preparation method is simple and convenient in process, low in cost and applicable to large-scale production, and existing decarburization-nitridation systems do not need to be changed.
Preparation method of SiBN fiber
The invention relates to a preparation method of SiBN fiber. The preparation method comprises the following steps: (1) preparing a high-activity Si-N fiber, namely adding an infusible polycarbosilane fiber into a decarburization-nitridation system, carrying out vacuumizing, replacing gas in the decarburization-nitridation system by virtue of nitrogen or argon until reaching an atmospheric pressure state, and repeating for at least three times; introducing high-purity ammonia gas, heating to 500 DEG C within 2 hours, after the temperature is increased to 700 DEG C at the speed of 0.90 DEG C/min-0.95DEG C/min, maintaining the temperature for 0.5 hour, heating until the temperature is 800-1200 DEG C at the speed of 100 DEG C/h, and maintaining the temeprature for 1-2 hours; introducing nitrogen/argon to cool to the room temperature, so as to obtain the high-activity Si-N fiber; (2) boronizing the high-activity Si-N fiber, namely heating until the temperature is 400-450 DEG C within 2 hours, introducing borane compound gas at least containing one B-H bond into the system, reacting for 24-36 hours, and introducing nitrogen/argon to cool to the room temperature; and (3) nitriding a boronized fiber, namely introducing high-purity ammonia gas, heating until the temperature is 1300-1400 DEG C within 6 hours, and maintaining the temperature for 1-2 hours; introducing nitrogen/argon to cool to the room temperature, so as to obtain the SiBN fiber. The preparation method is simple and convenient in process, low in cost and applicable to large-scale production, and existing decarburization-nitridation systems do not need to be changed.
Preparation method of SiBN fiber
XIE ZHENGFANG (author) / WANG JUN (author) / SHAO CHANGWEI (author) / SONG YONGCAI (author) / WANG HAO (author) / JIAN KE (author)
2015-08-12
Patent
Electronic Resource
English
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