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Effects of boron content on the microwave‐transparent property and high‐temperature stability of continuous SiBN fibers
Author(s) -
Long Xin,
Shao Changwei,
Wang Yingde
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17151
Subject(s) - materials science , microwave , microstructure , composite material , amorphous solid , boron , ultimate tensile strength , dielectric , thermal stability , chemical engineering , optoelectronics , chemistry , physics , organic chemistry , quantum mechanics , engineering
Owing to their high‐temperature stability and microwave‐transparent properties, SiBN fibers are promising reinforcement materials for microwave windows or radomes in harsh environments. This work investigates the high‐temperature properties of continuous SiBN fibers with different boron contents. Compared with Si 3 N 4 fibers, the SiBN fibers demonstrated superior high‐temperature stability, retaining their original tensile strength up to 1600°C with a smooth surface and amorphous structure. The boron‐containing microstructure improved the microwave‐transparent properties of the SiBN fibers by decreasing their dielectric constant and loss. The values were stabilized at temperatures up to 1200°C. The high‐temperature stability and microwave transparency of the SiBN fibers were likely contributed by the synergistic effect of the amorphous BN phase and the Si–N–B networks (the main existing state of the boron atoms).