Journal
MATERIALS
Volume 14, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/ma14206194
Keywords
composite ceramic fibers; boron nitride; silicon nitride
Categories
Funding
- Key Laboratory of Science and Technology on Particle Materials [CXJJ-21S043]
- Key Laboratory of Multiphase Complex Systems [MPCS-2021-a-02]
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences [IAGM2020C22]
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The effect of Si3N4 content on the microstructure of BN/Si3N4 composite ceramics was investigated, and it was found that the crystallization of Si3N4 could be totally restrained when its content was below 25 wt%, resulting in the formation of amorphous BN/Si3N4 composite ceramic.
Boron nitride (BN) ceramic fibers containing amounts of silicon nitride (Si3N4) were prepared using hybrid precursors of poly(tri(methylamino)borazine) (PBN) and polycarbosilane (PCS) via melt-spinning, curing, decarburization under NH3 to 1000 & DEG;C and pyrolysis up to 1600 & DEG;C under N-2. The effect of Si3N4 contents on the microstructure of the BN/Si3N4 composite ceramics was investigated. Series of the BN/Si3N4 composite fibers containing various amounts of Si3N4 from 5 wt% to 25 wt% were fabricated. It was found that the crystallization of Si3N4 could be totally restrained when its content was below 25 wt% in the BN/Si3N4 composite ceramics at 1600 & DEG;C, and the amorphous BN/Si3N4 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 Si3N4 mass content, while an obvious BN (shell)/Si3N4 (core) was formed only when the Si3N4 content reached 25 wt%.
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