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›› 2012, Vol. 12 ›› Issue (5): 864-869.

• 材料工程专栏 • 上一篇    下一篇

C/C-ZrB2-ZrC-SiC超高温复相陶瓷基复合材料的性能

谢昌明 钱扬保 魏玺 戈敏 张伟刚   

  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 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 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 中国科学院过程工程研究所 中国科学院过程研究所多相反应开放实验室
  • 收稿日期:2012-08-10 修回日期:2012-10-08 出版日期:2012-10-20 发布日期:2012-10-20
  • 通讯作者: 谢昌明

Performances of a Novel C/C-ZrB2-ZrC-SiC Composite with Ultra-high Temperature Ceramic Matrix

XIE Chang-ming QIAN Yang-bao WEI Xi GE min, ZHANG Wei-gang   

  1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences State Key Laboratory of Multi-Phase Reaction Engineering, Institute of Process Engineering, Chinese Academy of Sciences ．Institute of Process Engineering, Chinese Academy of Sciences Key Lab of Multi-phase Reactions, Institute of Process Engineering. Chinese Academy of Sciences
  • Received:2012-08-10 Revised:2012-10-08 Online:2012-10-20 Published:2012-10-20
  • Contact: XIE Chang-ming

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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%(j)的材料的力学性能最优，弯曲强度和断裂韧性分别为127.9 MPa和6.23 MPa×m1/2，且具有假塑性断裂特性. 材料在1800~2200℃等离子弧中1000 s的线烧蚀率小于1.67 mm/s，质量烧蚀率小于1.66 mg/s.

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

Abstract: 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%(j) 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 °C for 1000 s are less than 1.67 mm/s and 1.66 mg/s, respectively.

Key words: polymeric infiltration and pyrolysis, C/C-ZrB2-ZrC-SiC composite, mechanical property, ablation property

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