Processin of 2D C/SiC-ZrB₂ composites by slurry infiltration and reactive melt infiltration

2D C/SiC-ZrB₂ composites were prepared by combining slurry infiltration technology with reactive melt infiltration method. The phase identification and microstructure of the composites were analyzed by XRD, SEM and EDS. Mechanical properties were evaluated by three-point flexural test. The results show that when ZrB₂ powder and phenolic resin is infiltrated in turn under single-oriented pressure, they can be satisfactorily infiltrated into inter-bundles. But during the reactive melt infiltration precess, Si can not infiltrate into the samples efficiently.The open porosity and flexural strength of the as-fabricted specimens are 18.3% and 110 MPa, respectively. When ZrB₂ slurry is infiltrated under vacuum and the carbon matrix is infiltrated by chemical vapor infiltration method, the open porosity and flexural strength of as-fabricted composite are 5.5% and 230 MPa, respectively.