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Fabrication and properties of Cf/ZrC‐SiC‐based composites by an improved reactive melt infiltration
Authors:De‐Wei Ni  Jing‐Xiao Wang  Shao‐Ming Dong  Xiao‐Wu Chen  Yan‐Mei Kan  Hai‐Jun Zhou  Le Gao  Xiang‐Yu Zhang
Affiliation:1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;3. School of Materials Science and Engineering, Shanghai University, Shanghai, China
Abstract:Cf/ZrC‐SiC composites with a density of 2.52 g/cm3 and a porosity of 1.68% were fabricated via reactive melt infiltration (RMI) of Si into nano‐porous Cf/ZrC‐C preforms. The nano‐porous Cf/ZrC‐C preforms were prepared through a colloid process, with a ZrC “protective coating” formed surrounding the carbon fibers. Consequently, highly dense Cf/ZrC‐SiC composites without evident fiber/interphase degradation were obtained. Moreover, abundant needle‐shaped ZrSi2 grains were formed in the composites. Benefiting from this unique microstructure, flexural strength, and elastic modulus of the composites are as high as 380 MPa and 61 GPa, respectively, which are much higher than Cf/ZrC‐SiC composites prepared by conventional RMI.
Keywords:composites  mechanical properties  reactive melt infiltration  UHTCs  ZrC
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