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| Nanoindentation Behavior of C/C Composites with the Different Carbon Matrices |
| Received:May 21, 2019 Revised:June 17, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2019.10.011 |
| KeyWord:resin derived carbon pitch derived carbon pyrocarbon nanoindentation |
| Author | Institution |
| PENG Xue-feng |
Seventh Thirteen Institute of China Shipbuilding Industry Corporation, Zhengzhou , China |
| DAI Zong-miao |
Seventh Thirteen Institute of China Shipbuilding Industry Corporation, Zhengzhou , China |
| JIANG Jian-jun |
School of Mechanical Engineering, Northwestern Polytechnical University, Xi′an , China |
| ZHANG Dong-sheng |
School of Mechanical Engineering, Northwestern Polytechnical University, Xi′an , China |
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| Abstract: |
| Objective To study the effect of carbon matrix microstructure on the overall properties of materials. Methods Different carbon matrix C/C composites were prepared by resin-derived, pitch-derived, rough laminar and smooth laminar pyrocarbon. The microstructure of C/C composites with the different carbon matrices was observed by polarized light microscopy; and the crystallite size of carbon matrices of resin-derived, pitch-derived, rough laminar and smooth laminar pyrocarbon was characterized by X-ray diffraction and Raman spectroscopy. With vitreous carbon for reference, the elasticity modulus and hardness of samples with different carbon matrices were tested through nanoindentation. Results Graphite crystallites of pyrocarbon and pitch-derived carbon had fewer defects, better integrity and higher degree of graphitization; graphite crystallites of resin-derived and glassy carbon were disorderly arranged with low order and low degree of graphitization. The crystallite size Lc of carbon matrix by resin-derived was 1.69 nm, which was the smallest; but the modulus and hardness of that was the largest, separately (23.17±0.54) GPa and (3.26±0.10) GPa. The modulus and hardness of rough laminar and smooth laminar pyrocarbon was a litter smaller than that of resin derived carbon. The crystallite size Lc of the C/C-pitch composite was 9.36 nm, which was the largest; but the modulus and hardness was the smallest, about (12.53±2.29) GPa and (0.72±0.14) GPa. Conclusion In C/C composites of different carbon matrices, the higher the degree of graphitization, the larger the crystallite size, the more significant the anisotropicy, and the smaller the modulus and the hardness. |
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