Abstract
In this work,Cf/(CrZrHfNbTa)C-SiC high-entropy ceramic matrix composites with good load-bearing,elec-tromagnetic shielding and ablation resistance were designed and reported for the first time.The compos-ites were fabricated by an efficient combined processing of slurry infiltration lamination(SIL)and precur-sor infiltration and pyrolysis(PIP).Density and porosity of the as-fabricated composites are 2.72 g/cm3 and 12.44 vol.％,respectively,and the flexural strength is 185±13 MPa.Due to the carbon fiber rein-forcement with high conductivity and strong reflection,and high-entropy(CrZrHfNbTa)C ceramic matrix with strong absorbability,the total Electromagnetic interference shielding efficiency(SET)of the compos-ites with a thickness of 3 mm are as high as 88.2 dB and 90 dB respectively in X-band and Ku-band.This means that higher than 99.999999％electromagnetic shielding is achieved at 8-18 GHz,showing excel-lent electromagnetic shielding performance.The Cf/(CrZrHfNbTa)C-SiC composites also present excellent ablation resistance,with the linear and mass ablation rates of 0.9 μm/s and 1.82 mg/s after ablation at the heat flux of 5 MW/m2 for 300 s(～2450 ℃).This work opens a new insight for the synergistic de-sign of structural and functional integrated materials with load-bearing,electromagnetic shielding and ablation resistance,etc.
基金项目
国家重点研发计划(2022YFB3707700)
Program of Shanghai Academic/Technology Research Leader(23XD1424300)
国家自然科学基金(52332003)
NETL
NSTL
万方数据