Effects of TaC amount on the properties of 2D C/SiC-TaC composites prepared via precursor infiltration and pyrolysis

Variously contented tantalum carbide (TaC) were introduced into C/SiC composites by slurry infiltration, and then 2D C/SiC-TaC composites were prepared via precursor infiltration and pyrolysis (PIP). With increasing TaC content in the C/SiC-TaC composites, the density increased, the flexural strength and modulus decreased, and the ablation properties increased at first and then fell. The flexural strength and modulus of the composites with 19.0 vol% of TaC at ambient temperature were 246 MPa and 65 GPa, respectively. The flexural strengths of the composites reached to 98 MPa at 1800 degrees C, 122 MPa at 2000 degrees C, and 174 MPa (74% of the original value) after 20 min of oxidation at 1200 degrees C in air. After 60 s of ablation in an oxyacetylene torch environment, the mass loss and linear recession rates of the sample with 30.5 vol% of TaC were 0.017 g/s and 0.013 m/s, respectively. (c) 2013 Elsevier Ltd. All rights reserved.