| Ozone infusiblization and curing mechanism of polysilazane ceramic precursor fibers |
| Xiaohong Li1, Xiaoyu Luo1, Jing Li2, Jinxia Li1, Jiahao Yang1, Zahoor Ahmad1, Zhihao Bao1, Xiao Zhang1, Jianjun Chen1 |
1Institute of Advanced Ceramic Materials and Fibers, School of Materials Science and Engineering , Zhejiang Sci-Tech University , Hangzhou 310018 , China
2School of Materials and Architectural Engineering , Guizhou Normal University , Guiyang 550025 , China |
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Received: October 18, 2022; Revised: March 28, 2023 Accepted: April 14, 2023. Published online: May 16, 2023. |
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| ABSTRACT |
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An appropriate infusible method plays a vital role as one of the key processes of the fabrication of polymer-derived ceramic fi bers. In this work, ozone curing, a novel room temperature controllable curing strategy was used to prepare SiCN ceramic fi bers. Some circular pores were observed on the surface of the obtained SiCN ceramic fi bers. The tensile strength of the fi bers was also investigated. To reveal the ozone-curing mechanisms of the PSZ fi bers and the formation process of the circular pores, the FT-IR, SEM, OM, XRD and TG were characterized. The results showed that the Si–H bonds and Si-CH3 groups in the PSZ molecule were oxidized gradually to form oxygen-containing groups such as Si–OH, Si–O-Si and C = O in the ozone curing process, which contributed to the curing and weight gain of the PSZ fi bers. Moreover, a hydrolysis reaction between Si-NH-Si and H2O might further accelerate the curing of the PSZ fi bers. An unexpected result of the hydrolysis reaction is the formation of some circular pores on the surface layer of the PSZ fi bers. This strategy provides a method to design, adjust and control the microstructure and composition of silicon-based ceramic fi bers, and the obtained SiCN fi bers may be used as catalyst support, bacterial culture and other fi elds. |
| Key words:
Curing · Degradation · Polysilazane · Ozone · Ceramic Fibers |
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