Effect of Nitriding Process on Phase and Microstructure of Silicon Nitride Fibers Prepared by Direct Nitriding Method

doi:10.19691/j.cnki.1004-4493.2020.04.008

China's Refractories ›› 2020, Vol. 29 ›› Issue (4): 40-45.DOI: 10.19691/j.cnki.1004-4493.2020.04.008

• Original article • Previous Articles Next Articles

Effect of Nitriding Process on Phase and Microstructure of Silicon Nitride Fibers Prepared by Direct Nitriding Method

ZHANG Qi, YUAN Bo, WANG Gang^*(), HAN Jianshen, ZHAO Xin

State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2020-12-15 Published:2020-12-15
Contact: WANG Gang
About author:Zhang Qi received her master’s degree in materials science from Sinosteel Luoyang Institute of Refractories Research Co., Ltd. in 2014. Now she is engaged in refractories research in State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd. She has participated in 5 research projects and published more than 10 research papers and 2 patents.

Abstract

Abstract:

In this paper, Si₃N₄ fiber materials were fabricated by nitridation of porous Si green bodies, which were prepared by the foaming method combined with gel-casting. The effect of the nitriding process (the heating rate and the nitrogen flow rate) on the phase and the microstructure was studied. The results show that decreasing the heating rate and the nitrogen flow rate is both beneficial to the growth of Si₃N₄ nanofibers and promoting the disintegration of the pore wall structure of the porous green bodies. The optimized nitrogen flow rate and the heating rate for the growth of silicon nitride fibers are 150 mL/min and 0.5 °C/min, respectively.

Key words: nitriding process, silicon nitride fibers, microstructure

ZHANG Qi, YUAN Bo, WANG Gang, HAN Jianshen, ZHAO Xin. Effect of Nitriding Process on Phase and Microstructure of Silicon Nitride Fibers Prepared by Direct Nitriding Method[J]. China's Refractories, 2020, 29(4): 40-45.

Figures/Tables 6

Fig. 1 (a) XRD patterns of green bodies after nitridation at 1 400 °C for 5 h with different heating rates and (b) relative contents of crystalline phases calculated by Rietveld refinement method

Fig. 2 SEM images of samples after nitridation with different heating rates

Fig. 3 SEM images and fiber diameter distribution histograms of green bodies after nitridation

Fig. 4 (a) XRD patterns of samples after nitridation with different gas flow rates and (b) relative contents of crystalline phases calculated by Rietveld refinement method

Fig. 5 SEM micrograph of green body fracture surface

Fig. 6 SEM images of samples after nitridation with different gas flow rates

References 11

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Effect of Nitriding Process on Phase and Microstructure of Silicon Nitride Fibers Prepared by Direct Nitriding Method

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