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Cf/ZrB2–ZrC–SiC超高温陶瓷基复合材料的设计、制备及性能
作者:倪德伟1 2 陈小武1 2 王敬晓1 2 陈博文1 2 姜佑霖1 2 董绍明1 2 
单位:1. 中国科学院 高性能陶瓷和超微结构国家重点实验室 上海 200050  2. 中国科学院 上海硅酸盐研究所结构陶瓷与复合材料工程研究中心 上海 200050 
关键词:超高温陶瓷 陶瓷基复合材料 反应熔渗 
分类号:TQ174
出版年,卷(期):页码:2018,46(12):0-0
DOI:10.14062/j.issn.0454-5648.2018.12.02
摘要:

 提出了溶胶–凝胶孔道构建–反应熔渗制备新方法,首先通过溶胶凝胶方法在纤维预制体中引入B4C–C多孔体,获得Cf/B4C–C多孔预成型体结构;在此基础上,结合反应熔渗Si–Zr合金,获得Cf/ZrB2–ZrC–SiC超高温陶瓷基复合材料。研究了Cf/B4C–C多孔预成型体结构对RMI过程和材料性能的影响,并揭示了孔隙结构对基体分布和界面损伤及复合材料性能的影响规律。结果表明:通过灵活调控Cf/B4C–C孔隙结构可实现复合材料中ZrB2–ZrC–SiC基体分布改善和(PyC–SiC)2界面损伤缓解,大幅提升材料性能。当预成型体孔隙结构为25.9%和58.0 μm时,制备的Cf/ZrB2–ZrC–SiC复合材料基体可均匀分布于纤维束间和束内,同时纤维能得到良好的保护,材料表现出最优的力学性能(抗弯强度231 MPa)。

 Reactive melt infiltration (RMI) is an important method for fabrication of Cf/ZrB2–ZrC–SiC ultra–high temperature ceramic matrix composites. However, due to the influence of RMI kinetics, composites fabricated by conventional RMI method may have the disadvantages of bulk metal residuals and fiber/interphase degradation, leading to poor properties of the composites. In this work, a novel approach was presented to fabricate high performance Cf/ZrB2–ZrC–SiC composites by sol–gel processing combining with RMI. Cf/B4C–C porous preform was prepared by introducing B4C–C porous body into the fiber preform via sol–gel method. Subsequently, Si–Zr melt was infiltrated into the Cf/B4C–C porous preform and reacted to prepare Cf/ZrB2–ZrC–SiC composites. The effects of the Cf/B4C–C porous structure on the RMI process and composite properties were systematically studied. Furthermore, the internal relationships of the pore structures on the matrix distribution, the interphase erosion and composite properties were revealed. It is indicated that the distribution of ZrB2–ZrC–SiC matrix can be optimized and the degradation of (PyC–SiC)2 interphase can be mitigated by flexibly tailoring the pore structures of Cf/B4C–C preforms, leading to greatly improved composite properties. When porosity and pore size of the Cf/B4C–C preform is 25.9% and 58.0 μm respectively, optimized microstructure and mechanical properties can be achieved in the fabricated Cf/ZrB2–ZrC–SiC composite. Ceramic matrix is distributed homogeneously among the intra-bundle and inter-bundle. The fiber reinforcements are well protected. Outstanding mechanical properties with a bending strength of 231 MPa is obtained.

基金项目:
中国科学院率先行动“百人计划”项目
作者简介:
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