科研之友
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摘要
Inspired by grouting technique in architectural engineering, an innovative method of slurry injection and vacuum impregnation was put forward to introduce nanosized ZrC-SiC ceramics into PyC modified 3-D needle-punched carbon fiber preform homogeneously and continuously, followed by spark plasma sintering to prepare C-f/ZrC-SiC with graceful mechanical responses. The composite possessed improved fracture toughness and work of fracture at 5.37 +/- 0.25 MPa.m(1/2) and 951 +/- 12 J/m(2), 50% and nearly one order of magnitude higher than those of ZrC-SiC composite, respectively, with rivaling flexural strength at 177 +/- 8 MPa synchronously. A graceful fracture mode was embodied in an obviously extended yield plateau with increased failure displacement by 300%. This enhancement was attributed to the uniform and continuous combination of ZrC-SiC with carbon fiber preform as well as protection and interface tailoring from PyC coating. The study offered an easy and effective method of preparing 3-D fiber reinforced ceramic matrix composites.
