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Microstructural evolution and performance of carbon fiber-toughened ZrB2 ceramics with SiC or ZrSi2 additive

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      Abstract

      ZrB2–SiC/ZrSi2 ceramics containing 30 vol% carbon fiber (Cf) additive were fabricated by hot pressing at low temperature (1500 ℃) using submicron ZrB2 powders, and their microstructural evolution and performance were investigated. The addition of SiC or ZrSi2 significantly reduced the onset sintering temperature and enhanced the densification of ZrB2. ZrB2–ZrSi2–Cf showed poor performance owing to the serious fiber degradation, while the fiber degradation was effectively inhibited in ZrB2–SiC–Cf resulting in high fracture toughness, substantial fiber pull-out, and non-brittle fracture mode for such material. The critical thermal shock temperature difference of ZrB2–SiC–Cf was up to 741 ℃, significantly higher than those of ZrB2–SiC/ZrSi2 and ZrB2–ZrSi2–Cf. Moreover, this composite displayed a good oxidation resistance at 1500 ℃ in air.

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      Affiliations
      aSchool of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, China
      bNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China
      Author notes
      * Corresponding author. E-mail: guikx@ 123456ahpu.edu.cn
      Journal
      Journal of Advanced Ceramics
      Journal of Advanced Ceramics
      Tsinghua University Press (Tsinghua University, Beijing 100084, China )
      2226-4108
      05 December 2018
      : 07
      : 04
      : 343-351 (pp. )
      10.1007/s40145-018-0284-2
      2226-4108-07-04-343

      This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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