Structure and pyrolysis of nuclear-reactor-irradiated polycarbosilane ceramic precursor fibers

XIONG Liangping XU Yunshu XIA Xiulong HUANG Wei XIONG Jie GAO Xiaoling

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Structure and pyrolysis of nuclear-reactor-irradiated polycarbosilane ceramic precursor fibers

更新时间：2021-03-12

- Structure and pyrolysis of nuclear-reactor-irradiated polycarbosilane ceramic precursor fibers
- NUCLEAR TECHNIQUES Issue 12, (2006)
- 作者机构：
  
  1. 中国工程物理研究院核物理与化学研究所
  2. 中国工程物理研究院核物理与化学研究所,绵阳,621900
- 作者简介：
- 基金信息：
  
  中国工程物理研究院科学技术基金重大项目(批准号:2004Z0502)
- DOI：
  CLC： TQ174.1
- Published：01 December 2006
- 稿件说明：
移动端阅览
[1]熊亮萍,许云书,夏修龙,黄玮,熊洁,高小铃.反应堆辐照聚碳硅烷陶瓷先驱丝的结构与热解[J].核技术,2006(12):932-935.

XIONG Liangping XU Yunshu XIA Xiulong HUANG Wei XIONG Jie GAO Xiaoling. Structure and pyrolysis of nuclear-reactor-irradiated polycarbosilane ceramic precursor fibers[J]. Nuclear techniques, 2006, (12): 932-935.
[1]熊亮萍,许云书,夏修龙,黄玮,熊洁,高小铃.反应堆辐照聚碳硅烷陶瓷先驱丝的结构与热解[J].核技术,2006(12):932-935. DOI：

XIONG Liangping XU Yunshu XIA Xiulong HUANG Wei XIONG Jie GAO Xiaoling. Structure and pyrolysis of nuclear-reactor-irradiated polycarbosilane ceramic precursor fibers[J]. Nuclear techniques, 2006, (12): 932-935. DOI：

摘要

将聚碳硅烷（PCS）先驱丝在惰性气氛下用反应堆的混合辐射辐照

研究了辐照产物的化学结构以及中子注量等实验条件对不熔化效果的影响。在N2气氛下辐照中子注量为2.6×1017cm-2时

PCS先驱丝的凝胶含量和陶瓷产率分别达到了80%和94.3%

其高温烧成产物保持纤维形状

实现了不熔化处理。红外光谱分析结果表明

在辐照产物中形成了Si-CH2-Si的桥连结构

且未检测到与氧有关的吸收峰

说明此过程中引入的氧元素的量极少

可望制得高温性能优异的SiC纤维。

Abstract

Polycarbosilane (PCS) ceramic precursor fibers were irradiated by a nuclear reactor under inert atmosphere. The chemical structure of the irradiated products and the effect of neutron fluence on curing were studied

and the reaction mechanism was presumed. Results showed that the infusibilization of PCS fibers were achieved when irradiated at the neutron fluence of 2.6×1017cm-2 under N2 atmosphere

and the gel content and ceramic yield were 80% and 94.3%

respectively. The sintered products were still fibrous. The content of oxygen introduced in this process was very low. Bridge structure of Si―CH2―Si was formed by the rupture of Si-H bonds and succeeding radiation cross-linking.

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