A Simple Way to Prepare C/SiC Spring

Authors

  • Si'an Chen,

    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • Yudi Zhang,

    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • Changrui Zhang,

    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • Xin Xiong,

    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • Guangde Li,

    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • Haifeng Hu

    Corresponding author
    1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Hunan Province, People's Republic of China
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  • The authors thank the financial supports from National Natural Science Foundation of China (Grant No. 90816020, 90916019, 91116015), and Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.

Abstract

A new method to form helical C/SiC spring is proposed. Using paraffin mold as a sacrificial core, unidirectional carbon fiber bundles (infiltrated with resin) are wrapped around the mold to form helical spring, and after resin curing, the mold is removed, leaving a preform of C/SiC spring. Following densification is finished with precursor infiltration and pyrolysis (PIP) process. The spring constant of C/SiC spring reaches 7.88 N/mm and could be regulated by varying composite density and carbon fiber content. The spring properties could be improved by twisting the carbon fibers at 35–50 twist/m. The restoration ratio reaches 100%, but energy dissipation happens during unloading process. After oxidation in air at 1200°C for 10 min, the spring has an 82.4% spring constant remaining ratio.

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