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      Enhanced thermal shock and oxidation resistance of Si 2BC 3N ceramics through MWCNTs incorporation

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          Abstract

          Multi-walled carbon nanotubes (MWCNTs) reinforced Si 2BC 3N ceramics were prepared through mechanical alloying (MA) and following spark plasma sintering (SPS). The thermal shock resistance of Si 2BC 3N ceramics was evaluated comparatively through ice water quenching test and theoretical prediction. Furthermore, the oxidation resistance of MWCNTs incorporated Si 2BC 3N ceramics was evaluated under high temperature. The results show that the calculated parameters such as the critical thermal shock temperature ( R) and the thermal stresses resistance ( R st), as well as the toughness ( R′′′′) are improved with addition of 1 vol% MWCNTs. In addition, the crack propagation resistance of 1 vol% MWCNTs incorporated Si 2BC 3N ceramics is obviously improved through generating more tortuous crack propagation paths attributing to the “crack bridging”, “pull-out”, and “crack deflection” mechanisms of MWCNTs. Therefore, the residual strengths of 1 vol% MWCNTs containing specimens remained the highest after the thermal shock tests. Besides, the present work also reveals that the oxidation resistance is more sensitive to relative density than MWCNTs addition.

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          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 September 2018
          : 07
          : 03
          : 276-288 (pp. )
          Affiliations
          aInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
          bKey Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Ministry of Industry and Information Technology, China
          cState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
          dNational–provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan, China
          Author notes
          * Corresponding authors. E-mail: N. Liao, 2008beijing.ln@ 123456163.com
          Article
          2226-4108-07-03-276
          10.1007/s40145-018-0279-z

          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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