摘要
为进一步提升C/C-SiC-ZrC复合材料的抗烧蚀性能,采用反应熔渗法(reactive melt infiltration,RMI)制备ZrB_(2)超细粉体改性C/C-SiC-ZrC复合材料,考察ZrB_(2)超细粉体含量对改性复合材料的微观结构和烧蚀性能的影响。研究结果表明:相较于未改性的C/C-SiC-ZrC复合材料,ZrB_(2)超细粉体的引入使C/C-SiC-ZrC复合材料的密度由2.25 g/cm^(3)增至2.40~2.48 g/cm^(3);ZrB_(2)主要分布在ZrC基体中,且分布均匀;ZrB_(2)超细粉体的添加显著提升了复合材料的抗烧蚀性能;电火花等离子体烧蚀120 s后,当ZrB_(2)超细粉体摩尔分数为2%时,复合材料的质量烧蚀率和线烧蚀率最低,分别为6.90 mg/s和2.26μm/s;在烧蚀过程中,氧化生成的ZrO_(2)黏附在材料表面,与具有一定流动性的SiO_(2)形成龟壳状的ZrO_(2)-SiO_(2)氧化层,该氧化层减少了烧蚀过程中等离子体向基体的扩散和热传递,有效提升了改性复合材料的抗烧蚀性能。
To furtherly improve the ablation resistance of C/C-SiC-ZrC composites,ZrB_(2)ultrafine powder-modified C/C-SiC-ZrC composites were prepared by the reactive melt infiltration(RMI)method.The effects of ZrB_(2)ultrafine powder contents on the microstructure and ablation properties of modified composites were investigated.The results show that the introduction of ZrB_(2)ultrafine powder significantly increases the density of C/C-SiC-ZrC composites from 2.25 g/cm^(3)to 2.40−2.48 g/cm^(3),compared to the unmodified C/C-SiC-ZrC composites.ZrB_(2)is mainly observed in the ZrC matrix and exhibits uniform distribution.The addition of ZrB_(2)ultrafine powder significantly improves the ablation resistance of the composites.After 120 s of spark plasma ablation,the composites exhibites the lowest mass and linear ablation rates of 6.90 mg/s and 2.26μm/s,respectively,when the ZrB_(2)ultrafine powder mole fraction is 2%.During the ablation process,the oxidized ZrO_(2)adheres to the composites'surface,forming a tortoiseshell-like ZrO_(2)-SiO_(2)oxide layer with SiO_(2),which exhibits a certain degree of fluidity.The oxide layer reduces the diffusion and heat transfer of plasma to the matrix during the ablation process,which effectively improves the ablation resistance of modified composites.
作者
汤磊
尹健
熊翔
张红波
汪帅
左劲旅
TANG Lei;YIN Jian;XIONG Xiang;ZHANG Hongbo;WANG Shuai;ZUO Jinlü(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Hunan Boyun New Materials Co.Ltd.,Changsha 410205,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第8期3093-3104,共12页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(U19A2099)。
