以聚合环硼氮烷前驱体(PBN)为原料, 通过熔融纺丝、不熔化处理、高温热解陶瓷化等工艺制备了BN中空陶瓷纤维. 利用XRD、SEM、TEM等对BN中空纤维的物相、结构和形貌进行了分析和表征, 同时测量了BN中空纤维的抗氧化性能及介电性能. 研究表明, 升温速率和热解温度是影响BN中空纤维的结构及介电性能的重要因素. 在优化工艺条件下, 制备BN中空纤维介电性能优异, 介电常数ε′和介电损耗正切值tanδ分别小于3.30和0.00064(室温, 7~18 GHz), 在氧化气氛中的使用温度高达950℃.
BN fibers with cylindrical hollow structures were prepared from organic polymeric precursors through melt spinning, curing and pyrolysis processes. The microstructure, solid phase and morphologies of the synthesized hollow BN fibers were investigated by XRD, SEM and TEM, respectively. Moreover, the dielectric properties of BN hollow fibers were also measured. The results show that heating temperature and heating rate are the key factors affected the structure and dielectric properties of BN hollow fibers. Moreover, the BN hollow fibers synthesized in the optimized process conditions have good resistance towards oxidation up to 950℃ in an oxidation atmosphere, and possess very low dielectric constant (ε′) and loss tangent (tanδ) less than 3.30 and 0.00064 (7-18 GHz), respectively.
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