Microstructures and mechanical properties of three-dimensional ceramic filler modified carbon/carbon composites
Microstructures and mechanical properties of three-dimensional ceramic filler modified carbon/carbon composites
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DOI：
10.1016/j.ceramint.2013.06.015
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发表时间：
2014
影响因子：
5.2
通讯作者：
Yanzhi Cai;Shangwu Fan;X. Yin;Litong Zhang;Lai-fei Cheng;Yiguang Wang
中科院分区：
文献类型：
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作者：
Yanzhi Cai;Shangwu Fan;X. Yin;Litong Zhang;Lai-fei Cheng;Yiguang Wang
以三维针刺碳纤维整体毡为预制体，采用单向压力浆料浸渗-过滤-化学气相浸渗法制备了SiC或B4 C改性C/C复合材料：C/C-B4 C或C/C-SiC。陶瓷填料颗粒与热解碳基体之间存在包裹、环绕、嵌入和填充4种界面微观结构模式。对于C/C-B4 C，包裹、环绕和嵌入是主要的模式。C/C-SiC复合材料中，以包埋作用为主。陶瓷填料的加入使纤维/基体界面复杂化，形成复合界面层和双界面层。纤维/基体界面有三种类型：（纤维/填料/PyC）n/PyC、纤维/（填料/PyC）/PyC、纤维/填料/PyC。C/C的弯曲强度为98 MPa，而C/C-B4 C和C/C-SiC的弯曲强度分别为200和140 MPa。陶瓷填料的加入不仅提高了部分纤维/基体界面的结合强度，而且对PyC基体起到了增韧作用。
A three-dimensional needled carbon fiber integrated felt was used as the preform for SiC or B4C modified carbon/carbon (C/C) composite: C/C–B4C or C/C–SiC which was prepared through unidirectional pressure slurry infiltration-filtration followed by chemical vapor infiltration. There were four kinds of interface microstructure modes between ceramic filler particles and pyrolytic carbon (PyC) matrix: enwrapping, encircling, embedding and infilling. For C/C–B4C, enwrapping, encircling and embedding were the main modes. For C/C–SiC, embedding was the main one. The addition of ceramic filler complicated some fiber/matrix interfaces, forming composite interface layers and dual interface layers. There were three kinds of characteristic fiber/matrix interfaces: (fiber/filler/PyC)n/PyC, fiber/(filler/PyC)/PyC, fiber/filler/PyC. The flexure strength of C/C was 98 MPa, whereas those of C/C–B4C and C/C–SiC were 200 and 140 MPa, respectively. The addition of ceramic filler not only increased the bonding strength of some fiber/matrix interface, but also toughened the PyC matrix.