Effect of microstructure on the modulus of PAN-based carbon fibers during high temperature treatment and hot stretching graphitization
| Autor: | Dong-feng Li, Xinkui Wang, Hao-jing Wang |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Diffraction
Materials science Mechanical Engineering Carbon fibers Modulus Mineralogy Young's modulus Microstructure symbols.namesake Mechanics of Materials Transmission electron microscopy visual_art X-ray crystallography visual_art.visual_art_medium symbols General Materials Science Crystallite Composite material |
| Zdroj: | Journal of Materials Science. 42:4642-4649 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-006-0519-4 |
| Popis: | The changes of microstructure and Young’s modulus of PAN-based carbon fibers during the high temperature treatment (2400–3000 °C, stretching 0%) and hot stretching graphitization (0–5%, 2400 °C) were compared. It was observed that although the Young’s modulus of the fibers could be increased by the two graphitization techniques, the microstructure parameters determined by X-ray diffraction were different for the same value of modulus. The relationship between microstructure and modulus showed that Young’s modulus not only depended on the preferred orientation, but also related to the crystallite size (L c and L a) and shape (L a/L c). On the other hand, it was found that crystallite size of the fibers was mainly affected by heat treatment temperature and the crystallite shape could be altered by hot stretching graphitization. Further investigation indicated that the fibers were composed of turbostratic carbon structure even after heat treated to 3000 °C, which could be detected from the absence of 101 and 112 peaks in X-ray diffraction pattern, and the interlayer spacing (d002) and preferred orientation (Z) were only 0.3430 nm and 14.71°, respectively. |
| Databáze: | OpenAIRE |
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