Effect of Low-Crystallinity BN Coating on Properties of Continuous Si3N4 Fiber

doi:10.16552/j.cnki.issn1001-1625.2024.1605

Abstract

Abstract: BN coating was deposited on the surface of continuous Si₃N₄ fiber by chemical vapor deposition (CVD). The phase composition and microstructure of the fibers and BN coating were analyzed by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR). The effect of BN coating on the monofilament tensile strength of Si₃N₄ fibers was evaluated by the Weibull distribution method. The results show that the BN coating on Si₃N₄ fiber has a low-crystallinity structure with a B/N atomic ratio close to 1∶1. After deposition, the monofilament tensile strength distribution deviates from a normal distribution, and the strength dispersion increases. With increasing heat treatment temperature, the BN coating transforms into borosilicate glass, inhibiting the expansion of pore size and volume within the fiber. The strength of BN-coated fibers declines slowly with temperature and remains higher than that of uncoated fibers at 1 400~1 500 ℃.

Key words: BN coating, Si₃N₄ fiber, borosilicate glass, low-crystallinity, tensile strength, chemical vapor deposition

CLC Number:

TQ174

CUI Bingxia, JIANG Yuanqiang, WANG Han, CAI Wuji, HUANG Xiangxian, ZHANG Andong, WANG Xinbin. Effect of Low-Crystallinity BN Coating on Properties of Continuous Si₃N₄ Fiber[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2630-2637.

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Effect of Low-Crystallinity BN Coating on Properties of Continuous Si₃N₄ Fiber

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