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Polymer-Derived SiC/B4C/C Nanocomposites: Structural Evolution and Crystallization Behavior

Authors

  • Yun Jiang,

    1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, China
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  • Junfei Li,

    1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, China
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  • Farong Huang,

    Corresponding author
    1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, China
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  • Yan Zhou,

    1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, China
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  • Lei Du

    1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai, China
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Abstract

Structural evolution and crystallization behavior between 600°C and 1450°C during the preparation of bulk SiC/B4C/C nanocomposites by the pyrolysis of CB-PSA preceramic were investigated. The CB-PSA preceramic converts into carbon-rich SiBC ceramics up to 800°C. Structural evolution and crystallization of SiBC materials could be controlled by adjusting the pyrolytic temperature. The SiBC ceramics are amorphous between 800°C and 1000°C. Phase separation and crystallization begin at 1100°C. The crystallization of β-SiC takes place at 1100°C and B4C nanocrystallites generate at 1300°C. The sizes of β-SiC and B4C nanocrystals increase with the pyrolytic temperature rising. In addition, the boron-doping effect on structural evolution was studied by comparing the crystallization and graphitization behavior of SiBC ceramics and the corresponding SiC materials. Boron is helpful for the growth of β-SiC nanocrystals and the graphitization, but harmful for the nucleation of β-SiC crystallites.

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