ZrC纳米粉体改性C/C-SiC复合材料的微观结构和烧蚀性能  

Microstructure and ablation properties of ZrC nano-powder modified C/C-SiC composites

作　　者：汤磊 白凯伦 熊翔[1] 尹健[1] 张红波[1] 左劲旅 TANG Lei;BAI Kaiun;XIONG Xiang;YIN Jian;ZHANG Hongbo;ZUO Jinü(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Hunan Boyun New Materials Co.,Ltd.,Changsha 410205,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]湖南博云新材料股份有限公司,长沙410205

出　　处：《粉末冶金材料科学与工程》2024年第3期191-200,共10页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(U19A2099)。

摘　　要：为改善C/C-SiC复合材料的抗烧蚀性能,以ZrC纳米粉体和Si粉为反应渗料,采用反应熔渗(reactive melt infiltration,RMI)法制备ZrC纳米粉体改性C/C-SiC复合材料。采用X射线衍射仪、扫描电镜和能谱仪等研究ZrC纳米粉体含量对C/C-SiC复合材料微观结构和烧蚀性能的影响。结果表明:随ZrC纳米粉体含量增加,复合材料的孔隙率增大,而密度变化不大。ZrC纳米粉体一部分弥散分布在SiC基体中,一部分则发生了团聚。烧蚀30 s后,ZrC纳米粉体摩尔分数为6%时,复合材料的质量烧蚀率和线烧蚀率最低,分别为2.0 mg/s和3.9μm/s。随ZrC纳米粉体含量增加,烧蚀过程中形成的ZrO_(2)含量增多,对SiO_(2)的钉扎作用明显增强,能有效提升C/C-SiC复合材料的抗烧蚀性能。In order to improve the ablation resistance of C/C-SiC composites,ZrC nano-powder modified C/C-SiC composites were prepared by the reactive melt infiltration(RMI)with ZrC nano-powder and Si powder as raw materials.X-ray diffraction,scanning electron microscopy,and energy dispersive spectrometer were used to investigate the effects of ZrC nano-powder contents on the microstructure and ablation properties of C/C-SiC composites.The results indicate that with the increase of ZrC nano-powder content,the porosity of the composite increases,but the density changes little.Meanwhile,part of ZrC nano-powders are diffusely distributed in the SiC matrix,and part of them are agglomerated.After ablation for 30 s,when the mole fraction of ZrC nano-powder is 6%,the composite exhibits the lowest mass and linear ablation rates of 2.0 mg/s and 3.9μm/s,respectively.And with the increase of ZrC nano-powder content,the content of ZrO_(2) formed during ablation increases,this leads to a notable enhancement in the pinning effect on SiO_(2),effectively improving the ablation resistance of C/C-SiC composites.

关 键 词：C/C-SIC复合材料 ZrC纳米粉体 反应熔渗 微观结构 烧蚀性能 

分 类 号：TB332[一般工业技术—材料科学与工程]