EFFECT OF IRRADIATION ATMOSPHERE ON CHEMICAL STRUCTURE AND PYROLYSIS PROPERTIES OF POLYCARBOSILANE CERAMICS PRECURSOR FIBERS CURED BY γ-RAY

XU Yunshu; FU Yibei; SONG Yongcai; HUANG Ruiliang

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EFFECT OF IRRADIATION ATMOSPHERE ON CHEMICAL STRUCTURE AND PYROLYSIS PROPERTIES OF POLYCARBOSILANE CERAMICS PRECURSOR FIBERS CURED BY γ-RAY

更新时间：2023-04-07

- EFFECT OF IRRADIATION ATMOSPHERE ON CHEMICAL STRUCTURE AND PYROLYSIS PROPERTIES OF POLYCARBOSILANE CERAMICS PRECURSOR FIBERS CURED BY γ-RAY
- Journal of Radiation Research and Radiation Processing Vol. 17, Issue 3, Pages: 145-150(1999)
- 作者机构：
  
  1.中国工程物理研究院核物理与化学所　成都　610003
  1.国防科技大学五系　长沙　410073
- 作者简介：
- 基金信息：
  
  the National Science Foundation of China(19875043);the Science Foundation of China Academy of Enqineerinq Physics
- DOI：
  CLC：
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XU Yunshu, FU Yibei, SONG Yongcai, et al. EFFECT OF IRRADIATION ATMOSPHERE ON CHEMICAL STRUCTURE AND PYROLYSIS PROPERTIES OF POLYCARBOSILANE CERAMICS PRECURSOR FIBERS CURED BY γ-RAY. [J]. Journal of Radiation Research and Radiation Processing 17(3):145-150(1999)
DOI：

XU Yunshu, FU Yibei, SONG Yongcai, et al. EFFECT OF IRRADIATION ATMOSPHERE ON CHEMICAL STRUCTURE AND PYROLYSIS PROPERTIES OF POLYCARBOSILANE CERAMICS PRECURSOR FIBERS CURED BY γ-RAY. [J]. Journal of Radiation Research and Radiation Processing 17(3):145-150(1999) DOI：

摘要

将聚碳硅烷先驱丝分别在N,2,、He、NH,3,和限量空气条件下封装于石英管中，用γ射线辐照至特定剂量后，在高温条件下热解转化为SiC陶瓷纤维。结果表明：除在大气条件下因Si-H的氧化，在波数为3400cm ,-1,处产生强吸收峰以外，其它气氛中辐照产物的红外吸收光谱并无明显差异。用热重—红外光谱（TGA-FTIR）联用技术和气相色谱法检测到热解过程中有CH,4,和大量的H,2,析出。当吸收剂量达到13.8MGy时，辐照产物已具有良好的不熔化特性，在N,2,气流中升温至1200℃热解烧成后得到有金属光泽的黑色SiC纤维，其氧含量（1.1wt%）远低于现有的热氧化不熔化法产物（～15wt%）。用扫描电镜观察发现该纤维具有光洁完整的致密形貌结构。

Abstract

Polycarbosilane (PCS) ceramics precursor fibers were sealed in quartz tubes filled with N,2,He,NH,3, and air,irradiated to 1~15MGy by γ-ray, then converted to SiC ceramics fibers at 1200 C. Results showed that these filling gases have no significant effect on the FTIR spectra of the irradiated PCS fibers. But serious oxidation of Si-H group was observed in the samples which were irradiated in open air. By using TGA-FTIR coupled analyzing technique and gas chromatography, CH,4, and a lot of H2 were detected in the evolved pyrolysis gaseous product. When absorbed dose reached to 13.8MGy the irradiated PCS fibers become infusible fibers,and metal like black SiC fibers were obtained by heating the irradiated fibers to 1200℃ in N,2, gas. The oxygen content (1.1wt%) is much lower than conventional SiC fibers by oxidation curing method. No defects were observed in the SEM photos of these SiC fibers.

关键词

聚碳硅烷γ射线热解碳化硅纤维

Keywords

PolycarbosilaneGamma rayPyrolysisSilicon carbide fiber

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