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<p>Curing is one of the critical steps for preparing polymer-derived SiCN ceramic fibers, as it prevents the deformation and melting of polysilazane (PSZ) precursor fibers under high temperatures. Therefore, the development of an efficient curing method is essential. In previous work, the pyrolysis behavior of iodine vapor cured PSZ fibers has been reported. This work focused on iodine vapor curing process of PSZ fibers. To reveal the iodine curing mechanism of the PSZ fibers, SEM, electronic single fiber strength meter, FT-IR, XPS, and TGA were utilized. The result showed that the Si-H and N-H bonds in the PSZ fibers reacted with iodine and oxygen to form N-I bonds, Si-O-Si, and Si-O-C bridge structures during the curing process, which contributed to the curing of PSZ fibers. The obtained SiCN fibers exhibited a deformed and hollow morphology, along with a relatively low tensile strength when PSZ fibers were exposed to iodine vapor and air for shorter durations (0.5 to 2&#xa0;h). In contrast, the SiCN ceramic fibers demonstrated a dense structure when the curing time was extended to 3&#xa0;h. The work provides a guide for the curing of polymer derived ceramic fibers, which is different from air curing or electron beam irradiation curing.</p>

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Iodine vapor curing mechanisms of polysilazane fibers

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Xiaohong Li,
  • Cai Ye,
  • Jianjun Chen,
  • Zahoor Ahmad

摘要

Curing is one of the critical steps for preparing polymer-derived SiCN ceramic fibers, as it prevents the deformation and melting of polysilazane (PSZ) precursor fibers under high temperatures. Therefore, the development of an efficient curing method is essential. In previous work, the pyrolysis behavior of iodine vapor cured PSZ fibers has been reported. This work focused on iodine vapor curing process of PSZ fibers. To reveal the iodine curing mechanism of the PSZ fibers, SEM, electronic single fiber strength meter, FT-IR, XPS, and TGA were utilized. The result showed that the Si-H and N-H bonds in the PSZ fibers reacted with iodine and oxygen to form N-I bonds, Si-O-Si, and Si-O-C bridge structures during the curing process, which contributed to the curing of PSZ fibers. The obtained SiCN fibers exhibited a deformed and hollow morphology, along with a relatively low tensile strength when PSZ fibers were exposed to iodine vapor and air for shorter durations (0.5 to 2 h). In contrast, the SiCN ceramic fibers demonstrated a dense structure when the curing time was extended to 3 h. The work provides a guide for the curing of polymer derived ceramic fibers, which is different from air curing or electron beam irradiation curing.