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      Fabrication and microstructure of ZrB 2–ZrC–SiC coatings on C/C composites by reactive melt infiltration using ZrSi 2 alloy

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          Abstract

          ZrB 2–ZrC–SiC ternary coatings on C/C composites are investigated by reactive melt infiltration of ZrSi 2 alloy into pre-coatings. Two different pre-coating structures, including porous B 4C–C and dense C/B, are designed by slurry dip and chemical vapor deposition (CVD) process respectively. The coating prepared by reactive melt infiltration (RMI) into B 4C–C presents a flat and smooth surface with a three-layer cross-sectional structure, namely interior SiC transition layer, gradient ZrB 2–ZrC–SiC layer, and ZrB 2–ZrC exterior layer. In comparison, the coating prepared by RMI into C/B shows a more granular surface with a different three-layer cross-sectional structure, interior unreacted B–C pre-coating layer, middle SiC layer, and exterior ZrB 2–ZrC–ZrSi 2 layer. The forming mechanisms of the specific microstructures in two coatings are also investigated and discussed in detail.

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          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 March 2018
          : 07
          : 01
          : 64-71
          Affiliations
          [ a ] School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 200235, China
          [ b ] Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
          [ c ] State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
          Author notes
          * Corresponding author. E-mail: smdong@ 123456mail.sic.ac.cn
          Article
          2226-4108-07-01-64
          10.1007/s40145-017-0257-x

          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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