含非晶态氮化硅的连续 BN 陶瓷纤维的表征与微观结构演变

Characterization and Microstructural Evolution of Continuous BN Ceramic Fibers Containing Amorphous Silicon Nitride.

作者信息

Li Yang, Ge Min, Yu Shouquan, Zhang Huifeng, Huang Chuanbing, Kong Weijia, Wang Zhiguang, Zhang Weigang

机构信息

Key Laboratory of Science and Technology on Particle Materials, Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.

School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Materials (Basel). 2021 Oct 18;14(20):6194. doi: 10.3390/ma14206194.

DOI:10.3390/ma14206194

PMID:34683786

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8537905/

Abstract

Boron nitride (BN) ceramic fibers containing amounts of silicon nitride (SiN) were prepared using hybrid precursors of poly(tri(methylamino)borazine) (PBN) and polycarbosilane (PCS) via melt-spinning, curing, decarburization under NH to 1000 °C and pyrolysis up to 1600 °C under N. The effect of SiN contents on the microstructure of the BN/SiN composite ceramics was investigated. Series of the BN/SiN composite fibers containing various amounts of SiN from 5 wt% to 25 wt% were fabricated. It was found that the crystallization of SiN could be totally restrained when its content was below 25 wt% in the BN/SiN composite ceramics at 1600 °C, and the amorphous BN/SiN composite ceramic could be obtained with a certain ratio. The mean tensile strength and Young's modulus of the composite fibers correlated positively with the SiN mass content, while an obvious BN (shell)/SiN (core) was formed only when the SiN content reached 25 wt%.

摘要

采用聚（三（甲氨基）硼嗪）（PBN）和聚碳硅烷（PCS）的混合前驱体，通过熔融纺丝、固化、在NH气氛下1000℃脱碳以及在N气氛下1600℃热解，制备了含有一定量氮化硅（SiN）的氮化硼（BN）陶瓷纤维。研究了SiN含量对BN/SiN复合陶瓷微观结构的影响。制备了一系列SiN含量从5 wt%到25 wt%不等的BN/SiN复合纤维。结果发现，在1600℃的BN/SiN复合陶瓷中，当SiN含量低于25 wt%时，SiN的结晶可被完全抑制，并且可以获得一定比例的非晶态BN/SiN复合陶瓷。复合纤维的平均拉伸强度和杨氏模量与SiN质量含量呈正相关，而仅当SiN含量达到25 wt%时才形成明显的BN（壳）/SiN（核）结构。