Scholarlink

<p>Polyaluminocarbosilane (PACS)-derived Si–Al–C–O fibers are crucial intermediates for producing highly crystalline SiC fibers (Tyranno SA) and sintered SiC fiber-bonded ceramics (SA-Tyrannohex). However, traditional oxidation curing of PACS fibers is inherently inefficient, as it necessitates prolonged heating (over 20&#xa0;h) at a low rate (e.g., 10 ℃/h). This study explores an efficient curing method for PACS fibers to fabricate high-strength Si–Al–C–O fibers. Through the integration of electron beam irradiation in an oxygen-containing atmosphere with Subsequent annealing treatment, rapid and efficient curing of PACS fibers was achieved within 3&#xa0;h. Electron beam irradiation generated silicon radicals and initiated cross-linking, while the Subsequent annealing treatment eliminated residual silicon radicals and promoted further cross-linking. Under 5 MGy irradiation followed by annealing at 150 ℃ for 1&#xa0;h, the ceramic yield of PACS fibers increased from 52.1 to 73.4%. The resultant Si–Al–C–O fibers exhibited exceptional mechanical and thermal properties, with an average tensile strength of 3.2 GPa and a weight loss of less than 1% at 1500 ℃. However, the Si–Al–C–O fibers prepared by traditional oxidation method exhibited tensile strength of 2.0 GPa and weight loss of 16.4% at 1500 ℃. This work offered a practical pathway for the efficient fabrication of high-performance Si–Al–C–O fibers. The Si–Al–C–O fibers could be converted into highly crystalline SiC fibers by direct high-temperature sintering. This work provided a practical pathway for the efficient fabrication of high-performance SiC fibers.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fabrication of High-Strength Si–Al–C–O Fibers from Polyaluminocarbosilane (PACS) via Electron Beam Irradiation-Oxidation Curing and Annealing

  • 期刊论文

  • 发表日期：

    2025年9月19日

查看全文
  • Hui Wang,
  • Linying Huang,
  • Qin Ouyang,
  • Le Song,
  • Heng Wang,
  • Gaoming Mo,
  • Jing Huang,
  • Qing Huang

摘要

Polyaluminocarbosilane (PACS)-derived Si–Al–C–O fibers are crucial intermediates for producing highly crystalline SiC fibers (Tyranno SA) and sintered SiC fiber-bonded ceramics (SA-Tyrannohex). However, traditional oxidation curing of PACS fibers is inherently inefficient, as it necessitates prolonged heating (over 20 h) at a low rate (e.g., 10 ℃/h). This study explores an efficient curing method for PACS fibers to fabricate high-strength Si–Al–C–O fibers. Through the integration of electron beam irradiation in an oxygen-containing atmosphere with Subsequent annealing treatment, rapid and efficient curing of PACS fibers was achieved within 3 h. Electron beam irradiation generated silicon radicals and initiated cross-linking, while the Subsequent annealing treatment eliminated residual silicon radicals and promoted further cross-linking. Under 5 MGy irradiation followed by annealing at 150 ℃ for 1 h, the ceramic yield of PACS fibers increased from 52.1 to 73.4%. The resultant Si–Al–C–O fibers exhibited exceptional mechanical and thermal properties, with an average tensile strength of 3.2 GPa and a weight loss of less than 1% at 1500 ℃. However, the Si–Al–C–O fibers prepared by traditional oxidation method exhibited tensile strength of 2.0 GPa and weight loss of 16.4% at 1500 ℃. This work offered a practical pathway for the efficient fabrication of high-performance Si–Al–C–O fibers. The Si–Al–C–O fibers could be converted into highly crystalline SiC fibers by direct high-temperature sintering. This work provided a practical pathway for the efficient fabrication of high-performance SiC fibers.