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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (05): 418-424. 上一篇    下一篇

研究论文

Si-Zr-C-O纤维的耐高温抗氧化性能研究

曹淑伟*，谢征芳，王军，王浩，薛金根，牛加新   

  1. (国防科技大学航天与材料工程学院 CFC重点实验室 长沙 410073)
  • 投稿日期:2008-09-18 修回日期:2009-09-09 发布日期:2010-03-14
  • 通讯作者: 谢征芳 E-mail:xiezhengfang@163.com
  • 基金资助:

    国防基础预研项目，国防科技大学预研项目

High-temperature Resistance and Oxidation Resistance Performance of Si-Zr-C-O Fibers

Cao Shuwei* Xie Zhengfang Wang Jun Wang Hao Xue Jingen Niu Jiaxin   

  1. (State Key Laboratory of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073)
  • Received:2008-09-18 Revised:2009-09-09 Published:2010-03-14

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被引次数

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以聚硅碳硅烷(PSCS)与乙酰丙酮锆为原料合成聚锆碳硅烷(PZCS), 采用先驱体转化法制备了Si-Zr-C-O纤维. 通过元素分析、扫描电镜(SEM)、X射线衍射(XRD)和俄歇电子能谱(AES)等分析测试手段研究了Si-Zr-C-O纤维的组成结构及其耐高温抗氧化性能. 结果表明: Si-Zr-C-O纤维的元素组成为SiC1.24HxO0.56Zr0.0129, 平均强度2.5 GPa, 平均直径11 μm, 纤维表面光滑平坦, 没出现孔洞、裂纹、沟槽等缺陷, 直径均匀. 该纤维耐超高温性能良好, 在1450和1600 ℃处理后, 强度保留率分别为72%和36%, 1800 ℃处理后Si-Zr-C-O纤维的化学式为SiC0.99HxO0.1Zry, 纤维氧含量大大降低; 纤维抗氧化性能良好, 空气中1000 ℃热处理20 h后, 强度保留率为71.2%, 热处理100 h后, 强度保留率为50%.

关键词: Si-Zr-C-O纤维, 碳化硅, 耐高温, 抗氧化

Si-Zr-C-O fibers were obtained from polyzirconocarbosilane (PZCS), which was synthesized by the reaction of polysilacarbosilane (PSCS) and Zr(AcAc)4. The high-temperature resistance and oxidation resistance performance of Si-Zr-C-O fibers were examined by measurements of X-ray diffraction (XRD), scanning electron microscope (SEM), auger electron spectroscopy (AES) and element analysis. The surface of Si-Zr-C-O fibers is smooth, and do not exhibit obvious disfigurements. The average diameter of the fibers is 11 μm, the average tensile strength is 2.5 GPa. Si-Zr-C-O fibers have good high-temperature-resistant performance. Processing at 1450 and 1600 ℃, the tensile strength retention rate is 72% and 36% respectively. The chemical formula of Si-Zr-C-O fibers is SiC0.99HxO0.1Zry after processing at 1800 ℃, the oxygen content of the fibers decreases obviously. Si-Zr-C-O fibers also have good oxidation-resistance properties. After processing for 20 h at 1000 ℃ in the air, the tensile strength retention rate is 71.2%, after processing for 100 h, the tensile strength retention rate is 50%.

Key words: Si-Zr-C-O fiber, SiC, high-temperature resistance, oxidation resistance