Studies on curing mechanism of polycarbosilane precursor fibers irradiated by γ-rays below gelling dose

LI Yang; XU Yunshu

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Studies on curing mechanism of polycarbosilane precursor fibers irradiated by γ-rays below gelling dose

更新时间：2023-03-30

- Studies on curing mechanism of polycarbosilane precursor fibers irradiated by γ-rays below gelling dose
- Journal of Radiation Research and Radiation Processing Vol. 26, Issue 3, Pages: 146-150(2008)
- 作者机构：
  
  1.中国工程物理研究院核物理与化学研究所　绵阳　621900
  2.西南科技大学材料科学与工程学院　绵阳　621010
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LI Yang, XU Yunshu. Studies on curing mechanism of polycarbosilane precursor fibers irradiated by γ-rays below gelling dose. [J]. Journal of Radiation Research and Radiation Processing 26(3):146-150(2008)
DOI：

LI Yang, XU Yunshu. Studies on curing mechanism of polycarbosilane precursor fibers irradiated by γ-rays below gelling dose. [J]. Journal of Radiation Research and Radiation Processing 26(3):146-150(2008) DOI：

摘要

采用γ射线在开放空气气氛中辐照聚碳硅烷（Polycarbosilane，PCS）先驱丝，研究了吸收剂量低于凝胶点剂量的PCS先驱丝的化学结构以及后续的热解反应过程。结果表明，在射线作用下，空气中的氧通过与PCS中的Si-H、Si-CH,3,反应而被引入到辐照产物中，形成Si-OH、Si-O-Si和C=O等结构；随着热处理温度的提高，在产物中进一步检测到Si-O-Si以及Si-C-Si等桥联结构，并存在凝胶化产物；辐照以后的PCS先驱丝其起始热解温度从320℃提高到约600℃，陶瓷产率也从57.5%提高到约83%。在本实验范围内，凝胶点剂量前的PCS先驱丝试样均能烧成得到微观形貌完整的碳化硅（Silicon carbide，SiC）陶瓷纤维。

Abstract

Polycarbosilane (PCS) precursor fibers were irradiated by γ-rays in air. The structure and the subsequent pyrolysis reaction of PCS fibers irradiated below gelling dose were investigated. Results show that a little of oxygen is imported to form the structures of Si-O-Si、Si-OH and C=O from Si-H and Si-CH,3, of PCS in irradiation process. And gelatinized products formed from the Si-O-Si and Si-C-Si bridge structures obviously increase with the heat treatment temperature. It has been also found that the initial pyrolysis temperature of irradiated PCS fibers increases from 320℃ to 600℃, and the ceramic yields increase from 57.5% to about 83%. All the samples of PCS precursor fibers irradiated below gelling dos and under the condition with a little of oxygen can be pyrolyzed into SiC ceramic fibers with intact microstructure.

关键词

聚碳硅烷先驱丝γ射线辐照桥联结构不熔化处理热交联

Keywords

Polycarbosilane precursor fibersγ-rays irradiationBridge structuresCuringThermal cross-linking

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