The effect of zirconium addition on the microstructure and properties of chopped carbon fiber/carbon composites |
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| Affiliation: | 1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, 127#, Youyi Road, Xi''an, Shaanxi 710072, PR China;2. College of Materials and Mineral Resources, Xi''an University of Architecture and Technology, 13#, Yanta Road, Xi''an, Shaanxi 710055, PR China;1. Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Microwave Engineering Laboratory, Beihang University, Beijing 100191, China;1. Institute of Lightweight Structures, Chemnitz University of Technology, 09107 Chemnitz, Germany;2. Institute of Material Science and Engineering, Chemnitz University of Technology, 09107 Chemnitz, Germany |
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| Abstract: | Carbon/carbon composites containing zirconium were prepared using chopped carbon fiber, mesophase pitch and Zr powder by the traditional process including molding, carbonization, densification and graphitization. The influence of Zr on the microstructure and properties of the composites were investigated. Results show that Zr can improve the interface bonding, promote more perfect and larger crystallites and enhance the conductive/mechanical properties of the composites. The high in-plane thermal conductivity of 464 W/(m K) and excellent bending strength of 83.6 MPa was obtained for a Zr content of 13.9 wt% at heat treatment temperature(HTT) of 2500 °C. However the conductive/mechanical properties of the composites decrease dramatically for an higher HTT of 3000 °C. SEM micrograph of the fracture surface for the composites shows that lower disorder crystallite arrangement of fiber and carbon matrix come into being in the composites during HTT of 3000 °C, which should be responsible for the low properties. Correlation between the content of Zr and the microstructure and properties are discussed. |
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