| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Liquid Phase Vaporization TG-CVI Method Prepared C/C Composites: Microstructure and Properties |
| JI Genshun1,2, CHEN Xiaolong1,2, JIA Jiangang1,2, LI Xiaolong1, GONG Jingbo1, HAO Xiangzhong3
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1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China
2 Baiyin Research Institute of Novel Materials,Lanzhou University of Technology,Baiyin 730900,China
3 Technology Center of Gansu Haoshi Carbon Fiber Co.Ltd,Lanzhou 730010,China |
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Abstract For the sake of improving the densification rate of C/C composites, a reaction device combining precursor evaporation and pyrolytic carbon deposition was designed, taking cyclohexane as the carbon source precursor and carbon felt as the preform. Rapid preparation of the C/C composites was implemented by liquid phase vaporization TG-CVI and followed by heat treatment on the C/C composites at 2 000 ℃ for 2 h. Polarized light microscopy (PLM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to characterize the microstructure, fracture morphology, phase structure and crystallization degree of the C/C composites. Further, the bending strength of the C/C composites was measured by universal testing machine. According to the results, the annular preform with initial density of 0.14 g/cm3 can attain the average density of 1.65 g/cm3 after 20 h long experience under 1 000 ℃ and 20 kPa. A 0.075 5 g·cm-3·h-1 densification rate of liquid phase vaporization TG-CVI was achieved, which was nearly an order of magnitude higher than that of conventional ICVI. Rough layer carbon pyrolytic constituted the structure of the C/C composites, and the C/C composites presented a bending strength of about 63.24 MPa, and pseudo-plastic fracture. Undergoing heat treatment at 2 000 ℃ for 2 h, there were a phenomenal narrowing in the C(002) plane space, a converting of crystallites structure from chaotic graphite to ideal graphite crystal, and a considerable degree of graphitization in the C/C composites.
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Published: 03 January 2020
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| About author:: Genshun Ji, professor of Lanzhou University of Technology, is master's tutor. Professor Ji graduated from College of Materials Science, Xi'an Jiaotong University in 1995. Presided and completed several research projects, and appraised by experts of Gansu Provincial Scie-nce and Technology Commission. The research projects of the development and application of alloy austenite-bainite ductile iron awarded the third prize in scientific and technological progress of the National Machinery Industry Bureau. At present, his research works focus on the rapid densification of carbon/carbon composites to have low cost, anti-oxidation protection of carbon materials, and carbon fiber reinforced metal-based composites, and carry out one of the major science and technology projects of Gansu Province. |
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2020, Vol. 34 
