【摘要】 采用碳热还原法制备了（Hf,Zr,Nb,Ti）C高熵碳化物粉末，同时结合浆料浸渗与先驱体浸渍裂解工艺制备了（Hf,Zr,Nb,Ti）C高熵碳化物改性C/C-SiC复合材料，研究了高熵碳化物改性C/C-SiC复合材料等离子耐烧蚀性能与机理。结果表明：制备的复合材料主要由（Hf,Zr,Nb,Ti） C高熵相、SiC及C相组成；经30s的等离子火焰烧蚀后，复合材料的质量和线性烧蚀率分别为1.21 mg/s，32 μm/s。烧蚀后，形成的熔融氧化膜主要含有（Hf,Zr）O₂、（Hf,Zr,Nb,Ti）O_x、（Nb,Ti）O_y和（Hf,Zr）TiO₄固溶相，其对内部基体起到了较好的阻氧和抗冲刷防护作用，从而提升了材料的高温耐烧蚀性能。更多还原

【Abstract】 (Hf,Zr,Nb,Ti) C high entropy carbides were prepared by carbon thermal reduction method,and then the carbon fiber preform coated with pyrolytic carbon were densified by slurry infiltration and precursor impregnation pyrolysis process to prepared （Hf,Zr,Nb,Ti） C high entropy carbide modified C/C-SiC composites （C/C-HZNT-SiC）.The ablative property and mechanism of the prepared composites were investigated by plasma flame.The results show that the phase composition of the C/C-HZNT-SiC composites was （Hf,Zr,Nb,Ti） C high entropy,SiC,and C phase.After ablation under plasma flame for 30 s,the mass and linear ablation rates are 1.21 mg/s and 32 μm/s,respectively.Meanwhile,the formed molten film mainly contained （Hf,Zr）O₂,（Hf,Zr,Nb,Ti）O_x,（Nb,Ti）O_y and （Hf,Zr）TiO₄ solid solution phase,which can protect the inner matrix from further oxidation and ablation,therefore,enhancing the ablative property of the composites.更多还原