Abstract
To overcome the bottleneck in improving the high-temperature mechanical properties of SiC castables bonded with vulnerable oxides, a lab-synthesized special carbon nanofibers/calcium aluminate cement (CNFs/CAC) was used as a binder for SiC castables. The microstructural evolution, thermal shock resistance and high temperature modulus of rupture properties were investigated. The results showed that uniform and continuous SiC nanowire networks were generated in the matrix of SiC castables bonded with CNFs/CAC. The continuous network-like SiC nanowires were grown in the liquid phase using carbon nanofibers as templates. The high temperature modulus of rupture (HMOR) of the SiC castables bonded with CNFs/CAC was 52.2% higher than that of SiC castables bonded with Secar71. The residual strength ratio of the SiC castables bonded with CNFs/CAC after thermal shock increased by 28.3% (from 70.5% to 90.5%) compared to that of the SiC castables bond with Secar71. This is because the oxide binder was significantly reinforced by the SiC nanowires.
Published Version
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