Efficient fabrication and properties of 2D Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2) C-SiC high-entropy ceramic matrix composites via slurry infiltration lamination combined with precursor infiltration and pyrolysis

In this work, an efficient processing route was developed to fabricate Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-SiC composites via slurry infiltration lamination (SIL) combined with precursor infiltration and pyrolysis (PIP). The (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C powder was initially synthesized at 1900 degrees C. Then the 2D Cf/ (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-SiC composites were obtained via SIL and PIP at temperatures no higher than 1100 degrees C. The as-fabricated composites show a density of 2.52 g/cm3 and an open porosity of 15.2 vol%, with a bending strength of 255 & PLUSMN; 15 MPa. The 2D Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-SiC composites also present excellent ablation resistance, with the linear and mass recession rates of 0.33 & mu;m/s and 0.60 mg/s after ablation at 2000 degrees C/300 s. This work provides a route for the efficient fabrication of Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-SiC composites, and also inspires new strategies to develop high-entropy ceramic matrix composites with high performance.