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Structural evaluation and mechanical property of boron nitride fibers during melt‐drawn fabrication process
Author(s) -
Wang Chonghai,
Hong Changqing,
Yan Liwen,
Lin Xue,
Zhang Mingxia,
Wang Jiazhi,
Qu Qiang
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12857
Subject(s) - materials science , boron nitride , composite material , ultimate tensile strength , crystallinity , scanning electron microscope , x ray photoelectron spectroscopy , fabrication , fourier transform infrared spectroscopy , crystallization , elastic modulus , chemical engineering , medicine , alternative medicine , pathology , engineering
Boron nitride ( BN ) fibers were fabricated on a large scale through the melt‐drawn technique from low‐cost boric acid, NH 3 , and N 2 . Evolution of structure and properties of BN fibers during the fabrication process was studied by Fourier transform infrared (FT‐IR), X‐ray diffraction ( XRD ), scanning electron microscope ( SEM ), and X‐ray photoelectron spectroscopy ( XPS ). The mechanical properties of BN fibers were tested and analyzed. The results shown that both the mechanical properties and the crystallinity of BN fibers slightly increased with the temperature from 450 to 850°C, due to the combination of the fused‐B 3 N 3 . For BN fibers heat‐treated at 850 or 1000°C, the tensile strength (σ R ) and elastic modulus ( E ) were strongly increased because of the increase in crystallization of the BN phase. The meso‐hexagonal BN fibers with a diameter of 5.0 μm were fabricated at 1750°C, of which the tensile strength (σ R ) and elastic modulus ( E ) are 1200 MP a and 85 GP a, respectively. BN fibers with excellent mechanical properties and proper diameters were obtained by nitriding of green fibers during their conversion into ceramic.