高固相含量浆料浸渗法制备C/C-SiC复合材料及其性能  

Preparation and properties of C/C–SiC composites by high-solid-loading slurry impregnation

作　　者：尹欢 彭可[1] 饶菲 易茂中[1] YIN Huan;PENG Ke;RAO Fei;YI Maozhong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2018年第5期539-546,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省自然科学基金资助项目(2017JJ2320)

摘　　要：采用高固相含量浆料浸渗法制备C/C-SiC复合坯体,通过先驱体浸渍裂解工艺(PIP)增密制得C/C-SiC复合材料。对浸渗浆料的流变行为以及C/C-SiC复合材料的微观结构、力学性能和抗烧蚀性能进行研究。结果表明:用体积分数为5%乙醇水溶液制备SiC浆料,当浆料pH值为6,聚乙烯亚胺(PEI)质量分数为0.7%,固相体积分数为40%时,浆料具有良好的流动性和渗透性。浆料浸渗后的坯体中,SiC颗粒主要分布在网胎层及针刺纤维区域。C/C-SiC复合材料具有优良的力学性能,其抗弯强度和断裂韧性分别为335.7 MPa和16.2 MPa·m1/2。在2 000℃氧乙炔焰烧蚀条件下,SiC被氧化生成的Si O2可填充气孔、裂纹等缺陷,防止材料进一步氧化,使得C/C-SiC复合材料表现出良好的耐烧蚀性能。C/C-SiC composites were prepared by high-solid-loading slurry impregnation and densified by precursor infiltration and pyrolysis(PIP)process.The rheological properties of the slurry,the microstructure,the mechanical properties and the ablative properties of the composites were studied.The results show that a good fluidity and permeability high-solid-loading(40%)SiC slurry can be prepared with 5%ethanol water,when the pH value of slurry is 6 and the mass fraction of PEI is 0.7%.SiC mainly concentrates in the fiber webs between the non-woven layers homogeneously.The bending strength and fracture toughness of C/C-SiC composites are 335.7 MPa and 16.2 MPa·m1/2,respectively.C/C-SiC composites have good ablation resistance at 2 000℃,and the oxidation product SiO2 can fill the defects such as pores and cracks to prevent the further oxidation of the materials.

关 键 词：C/C-SIC复合材料 浆料 微观结构 力学性能 烧蚀性能 

分 类 号：TB332[一般工业技术—材料科学与工程]