Mechanical response and microstructure of 2D carbon fiber reinforced ceramic matrix composites with SiC and Ti3SiC2 fillers

2D carbon fiber reinforced ceramic matrix composites are prepared by PIP process using SiC and Ti3SiC2 as separate fillers. The effect of SiC and Ti3SiC2 fillers on mechanical property, fracture behavior and microstructure of the final composites is studied. The force–displacement curve shows no apparent delamination in Cf/Ti3SiC2–SiC composites during three-point flexural test, compared to Cf/SiC composites in which the through-thickness crack is much more devious. The ultimate force of Cf/Ti3SiC2–SiC composites is much lower than Cf/SiC composites. The thermal expansion mismatch and chemical reactions between carbon fiber and the matrix make the fiber–matrix interface bonding stronger in Cf/Ti3SiC2–SiC composites. It can infer that the carbon fibers׳ strength can be damaged by the chemical reactions. The thermal expansion mismatch and chemical reactions are two important factors that influence the mechanical properties and microstructure of the final composites.