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<p>The development of cost-effective precursors for the facile fabrication of continuous boron nitride fibers (BNFs) is a prerequisite for the large-scale utilization of boron nitride (BN) ceramics and remains a pressing pursuit in contemporary materials research. Herein, we report a novel and polymer-additive-free method for producing BNFs based on a stable low-crosslinked dicyandiamide–formaldehyde–boric acid resin (LC-DFBR) system. The preparation of BNFs involves three key steps: straightforward spinning of the LC-DFBR, heat treatment to form high-crosslinked fibers (FP), and followed by high-temperature pyrolysis of these fibers. The LC-DFBR with excellent stability and spinnability forms FP via spinning and non-foaming treatment, effectively avoiding structural damage to continuous BNFs during pyrolysis. In this method, a controllable heat treatment temperature from 1100 to 1500&#xa0;°C and the introduction of an appropriate amount of boric acid at the precursor stage endow the BNFs with a rich microporous structure and a high specific surface area (SSA). However, after heat treatment at 1600&#xa0;°C, the micropores undergo fusion and collapse, which facilitate a highly dense and intact fibrous morphology for BNFs, endowing the BNFs with excellent mechanical properties. Besides, we also rationally propose a possible formation mechanism of the pyrolyzed BNFs derived from the LC-DFBR fibers.</p>

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Continuous Boron Nitride Fibers Derived from Dicyandiamide–Formaldehyde–Boric Acid Resin

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Zifeng Niu,
  • Weilong Wu,
  • Lu Meng,
  • Haoran Chen,
  • Shijie Ma,
  • Jigang Zhao,
  • Ziyi Yin,
  • Jun Zhang,
  • Chengchun Tang,
  • Yanming Xue

摘要

The development of cost-effective precursors for the facile fabrication of continuous boron nitride fibers (BNFs) is a prerequisite for the large-scale utilization of boron nitride (BN) ceramics and remains a pressing pursuit in contemporary materials research. Herein, we report a novel and polymer-additive-free method for producing BNFs based on a stable low-crosslinked dicyandiamide–formaldehyde–boric acid resin (LC-DFBR) system. The preparation of BNFs involves three key steps: straightforward spinning of the LC-DFBR, heat treatment to form high-crosslinked fibers (FP), and followed by high-temperature pyrolysis of these fibers. The LC-DFBR with excellent stability and spinnability forms FP via spinning and non-foaming treatment, effectively avoiding structural damage to continuous BNFs during pyrolysis. In this method, a controllable heat treatment temperature from 1100 to 1500 °C and the introduction of an appropriate amount of boric acid at the precursor stage endow the BNFs with a rich microporous structure and a high specific surface area (SSA). However, after heat treatment at 1600 °C, the micropores undergo fusion and collapse, which facilitate a highly dense and intact fibrous morphology for BNFs, endowing the BNFs with excellent mechanical properties. Besides, we also rationally propose a possible formation mechanism of the pyrolyzed BNFs derived from the LC-DFBR fibers.