Understanding the correlation of C/C preform density and microstructure and properties of the resulting composites is of great importance for the fast and economical fabrication of ultra-high-temperature ceramic matrix composites by reactive melt infiltration. In this paper, C/C-ZrC composites were prepared by eutectic Zr-Si alloyed melt infiltration using different density C/C composite preforms, and the influence of C/C preform densities on the microstructure and mechanical properties of the composites was investigated. The results showed that the densities of the composites decreased with the increase of the C/C preform densities while the open porosities always kept at small values.
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