Abstract
A novel HfC precursor and polycarbosilane were combined to fabricate 3-dimensional 4-directional (3D4d) Cf/HfC-SiC composites by precursor impregnation and pyrolysis (PIP). The characterization of HfC precursor demonstrated its suitability for PIP process. Among these 3D4d Cf/HfC-SiC composites, the flexural strength and fracture toughness increased as the SiC/HfC ratio was improved. The 3D4d Cf/HfC-SiC composite (S9-Cf/HfC-SiC) with the highest SiC/HfC ratio of 22.5/11.8 had the high flexural strength of 386.2 ± 50.0 MPa and fracture toughness of 15.9 ± 0.1 MPa m1/2. A typical 3D4d Cf/HfC-SiC composite (S9-Cf/HfC-SiC) was selected for ablation test by oxyacetylene torch and its mass and linear ablation rates were 0.51 ± 0.02 mg cm−2 s−1 and 0.006 ± 0.0002 mm s−1, respectively.
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