炭纤维表面SiC/SiO<sub>2</sub>抗氧化涂层的溶胶凝胶法制备

夏克东1; 2|　吕春祥1|　杨　禹1

炭纤维表面SiC/SiO₂抗氧化涂层的溶胶凝胶法制备

采用溶胶凝胶法|并经高温热处理在炭纤维表面制备SiC/SiO₂陶瓷涂层。通过X-射线光电子能谱、X-射线衍射、扫描电镜等分析SiC/SiO₂涂层的结构与形貌。通过热重分析研究炭纤维涂层前后的抗氧化性能。结果表明,均匀、无裂纹的SiC/SiO₂涂层可改善炭纤维的抗氧化性能|而且涂层炭纤维的抗氧化性能随着溶胶浓度和热处理温度的升高而增加。与原始炭纤维相比|具有300nm涂层厚度的炭纤维起始氧化温度提高了200℃。但是当涂层超过一定厚度时|涂层开裂脱落|炭纤维的抗氧化性能降低。SiC/SiO₂涂层炭纤维的拉伸强度与原始纤维相比降低了37.7%|在700℃等温氧化90min|涂层纤维的拉伸强度为1.37GPa|仍保留一定的强度。

详细信息

中图分类号: TQ342⁺.74
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出版历程
- 收稿日期: 2013-03-07
- 录用日期: 2013-07-16
- 修回日期: 2013-06-02
- 刊出日期: 2013-06-20

Preparation of an anti-oxidative SiC/SiO₂ coating on carbon fibers by a sol-gel method

XIA Ke-dong1,
2

A SiC/SiO₂ ceramic coating on carbon fibers was prepared by a sol-gel method followed by heat treatment at high temperature. The structure and the morphology of the SiC/SiO₂ coating were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. The oxidation resistant properties of the carbon fibers with and without the coating were compared by thermogravimetric analysis. Results indicate that a uniform and continuous coating can improve the oxidation resistance of carbon fibers. The oxidation resistance of the coated carbon fibers increased with increases in the sol concentration and heat treatment temperature. A coating of thickness 300 nm increased the onset oxidation temperature by about 200℃ and the single fiber tensile strength was decreased by 37.7% compared with the pristine carbon fibers. After isothermal oxidation at 700℃ for 90 min, the single fiber tensile strength of the coated carbon fibers was decreased to 1.37 GPa. The oxidation resistance of the fibers was decreased when the coating thickness exceeded 400 nm due to the spallation of the coating.

摘要

摘要: 采用溶胶凝胶法，并经高温热处理在炭纤维表面制备SiC/SiO₂陶瓷涂层。通过X-射线光电子能谱、X-射线衍射、扫描电镜等分析SiC/SiO₂涂层的结构与形貌。通过热重分析研究炭纤维涂层前后的抗氧化性能。结果表明,均匀、无裂纹的SiC/SiO₂涂层可改善炭纤维的抗氧化性能，而且涂层炭纤维的抗氧化性能随着溶胶浓度和热处理温度的升高而增加。与原始炭纤维相比，具有300nm涂层厚度的炭纤维起始氧化温度提高了200℃。但是当涂层超过一定厚度时，涂层开裂脱落，炭纤维的抗氧化性能降低。SiC/SiO₂涂层炭纤维的拉伸强度与原始纤维相比降低了37.7%，在700℃等温氧化90min，涂层纤维的拉伸强度为1.37GPa，仍保留一定的强度。
- 溶胶凝胶 /
- 炭纤维 /
- 抗氧化 /
- SiC/SiO₂涂层
Abstract: A SiC/SiO₂ ceramic coating on carbon fibers was prepared by a sol-gel method followed by heat treatment at high temperature. The structure and the morphology of the SiC/SiO₂ coating were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. The oxidation resistant properties of the carbon fibers with and without the coating were compared by thermogravimetric analysis. Results indicate that a uniform and continuous coating can improve the oxidation resistance of carbon fibers. The oxidation resistance of the coated carbon fibers increased with increases in the sol concentration and heat treatment temperature. A coating of thickness 300 nm increased the onset oxidation temperature by about 200℃ and the single fiber tensile strength was decreased by 37.7% compared with the pristine carbon fibers. After isothermal oxidation at 700℃ for 90 min, the single fiber tensile strength of the coated carbon fibers was decreased to 1.37 GPa. The oxidation resistance of the fibers was decreased when the coating thickness exceeded 400 nm due to the spallation of the coating.
- Sol-Gel /
- Carbon fiber /
- Oxidation resistance /
- SiC/SiO₂ coating