C/C-ZrB_2-ZrC-SiC超高温复相陶瓷基复合材料的性能  

Performances of a Novel C/C-ZrB_2-ZrC-SiC Composite with Ultra-high Temperature Ceramic Matrix

作　　者：谢昌明[1] 钱扬保[1] 魏玺[1] 戈敏[1] 张伟刚[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190

出　　处：《过程工程学报》2012年第5期864-869,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金青年科学基金项目(编号:51102236);中国科学院知识创新工程重要方向项目(编号:YYYJ-0808-2)

摘　　要：以聚合有机锆烷、聚合有机硼氮锆烷与聚碳硅烷组成的共溶前驱体为原料,采用化学气相渗透和聚合物浸渍裂解工艺制备了C/C-ZrB2-ZrC-SiC超高温陶瓷基复合材料,对其物相组成、微观结构、力学性能和抗烧蚀性能进行了研究.结果表明,所制材料基体由ZrB2和ZrC纳米颗粒均匀弥散分布于连续的SiC相中构成.随热解炭含量增加,材料的弯曲强度和断裂韧性皆呈先上升再下降的趋势,其含量为22.3%(φ)的材料的力学性能最优,弯曲强度和断裂韧性分别为127.9MPa和6.23MPam1/2,且具有假塑性断裂特性.材料在1800～2200℃等离子弧中1000s的线烧蚀率小于1.67μm/s,质量烧蚀率小于1.66mg/s.C/C-ZrB2-ZrC-SiC composite was prepared by a combined process of chemical vapor infiltration of pyrocarbon and polymeric impregnant/pyrolysis of ceramics using a hybrid precursor of polycarbosilane, zirconium-carbon containing polymer and zirconium-boron-carbon containing co-polymer. The composition and microstructure of prepared composite was characterized. Its mechanical and ablation properties were also studied under high temperature oxidation. The formed ultra-high temperature ceramic matrix of ZrB2 and ZrC nanoparticles are homogeneously dispersed in the continuous SiC phase, these three phases form ZrB2-ZrC-SiC homogeneous ceramic matrix of the composite. Flexural strength and fracture toughness of the composite firstly increase and then decrease with increasing of pyrocarbon, and the composite with 22.3%（φ） pyrocarbon exhibits the optimum mechanical properties of flexural strength of 127.9 MPa and fracture toughness of 6.23 MPa-m1/2 and pseudoplastic failure behavior. Its linear and mass ablation rates in plasma arc test at 1800-2200 ℃ for 1000 s are less than 1.67 μm/s and 1.66 mg/s, respectively.

关 键 词：前驱体浸渍-裂解 C C-ZrB2-ZrC—SiC复合材料 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]