Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Near-stoichiometric continuous BN ceramic fiber and preparation method thereof
The invention provides a near-stoichiometric continuous BN ceramic fiber which has a near-stoichiometric composition, wherein the atomic ratio of boron to nitrogen is (0.715: 1)-(1.388: 1), the strength is 1.0-1.6 GPa, the modulus is 120-280 GPa, the diameter is about 10 microns, the length is greater than 500 m, and the crystallinity is greater than 90%. The preparation method comprises the following steps: S1, carrying out non-melting heat treatment in a boron trichloride atmosphere: putting polyborazine precursor fibers into a nitrogen tube furnace, when the temperature is raised to 40-100 DEG C, introducing boron trichloride gas, carrying out heat preservation treatment, and then replacing gas in the furnace with nitrogen; S2, carrying out decarburization heat treatment in an ammonia gas atmosphere: raising the temperature to 450-850 DEG C in the ammonia gas atmosphere, keeping the temperature, and performing natural cooling to room temperature; S3, performing high-temperature firing heat treatment in an inert atmosphere: heating to 1600-2000 DEG C in an argon atmosphere, preserving heat, and performing natural cooling to room temperature to obtain the BN ceramic fiber.
提供了一种近化学计量比的连续BN陶瓷纤维，它具有近化学计量比的组成，且硼氮原子比为(0.715:1)～(1.388:1)，强度1.0～1.6GPa，模量120～280GPa，直径～10μm，长度>500m，结晶度>90％。制备方法如下：S1、三氯化硼气氛不熔化热处理：在将聚硼氮烷先驱体纤维置于氮气管式炉内，温度升至40‑100℃时，通入三氯化硼气体，保温处理，然后用氮气置换炉内气体；S2、氨气气氛脱碳热处理：在氨气气氛下升温至450‑850℃并保温，自然冷却至室温；S3、惰性气氛高温烧成热处理：在氩气气氛下再升温至1600‑2000℃并保温，自然冷却至室温后即得到BN陶瓷纤维。
Near-stoichiometric continuous BN ceramic fiber and preparation method thereof
The invention provides a near-stoichiometric continuous BN ceramic fiber which has a near-stoichiometric composition, wherein the atomic ratio of boron to nitrogen is (0.715: 1)-(1.388: 1), the strength is 1.0-1.6 GPa, the modulus is 120-280 GPa, the diameter is about 10 microns, the length is greater than 500 m, and the crystallinity is greater than 90%. The preparation method comprises the following steps: S1, carrying out non-melting heat treatment in a boron trichloride atmosphere: putting polyborazine precursor fibers into a nitrogen tube furnace, when the temperature is raised to 40-100 DEG C, introducing boron trichloride gas, carrying out heat preservation treatment, and then replacing gas in the furnace with nitrogen; S2, carrying out decarburization heat treatment in an ammonia gas atmosphere: raising the temperature to 450-850 DEG C in the ammonia gas atmosphere, keeping the temperature, and performing natural cooling to room temperature; S3, performing high-temperature firing heat treatment in an inert atmosphere: heating to 1600-2000 DEG C in an argon atmosphere, preserving heat, and performing natural cooling to room temperature to obtain the BN ceramic fiber.
提供了一种近化学计量比的连续BN陶瓷纤维，它具有近化学计量比的组成，且硼氮原子比为(0.715:1)～(1.388:1)，强度1.0～1.6GPa，模量120～280GPa，直径～10μm，长度>500m，结晶度>90％。制备方法如下：S1、三氯化硼气氛不熔化热处理：在将聚硼氮烷先驱体纤维置于氮气管式炉内，温度升至40‑100℃时，通入三氯化硼气体，保温处理，然后用氮气置换炉内气体；S2、氨气气氛脱碳热处理：在氨气气氛下升温至450‑850℃并保温，自然冷却至室温；S3、惰性气氛高温烧成热处理：在氩气气氛下再升温至1600‑2000℃并保温，自然冷却至室温后即得到BN陶瓷纤维。
Near-stoichiometric continuous BN ceramic fiber and preparation method thereof
一种近化学计量比的连续BN陶瓷纤维及其制备方法
WANG BING (Autor:in) / DU YI'ANG (Autor:in) / WANG YINGDE (Autor:in)
03.09.2021
Patent
Elektronische Ressource
Chinesisch
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