Microstructures and mechanical behaviors of CVI-based C/C composites containing h-BN powdered additives
Microstructures and mechanical behaviors of CVI-based C/C composites containing h-BN powdered additives
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含 h-BN 粉末添加剂的 CVI 基 C/C 复合材料的微观结构和力学行为
DOI：
10.1016/j.jmst.2019.07.003
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发表时间：
2019-12
影响因子：
10.9
通讯作者：
Li Yang
中科院分区：
文献类型：
--
作者：
Xiao Peng;Li Zhichao;Liu Zeyan;Li Zhuan;Zhang Bengu;Li Jinwei;Li Yang
通过粉末添加将六方氮化硼（h-BN）粉末引入碳纤维预制体中，随后结合化学气相渗透（CVI）进行致密化，制备碳纤维增强/碳和氮化硼双基复合材料（C/C-BN）。研究了三种不同体积含量的 h-BN 粉末的 C/C 复合材料的微观结构和力学性能，并与纯 C/C 复合材料进行了比较。结果表明，在C/C复合材料中引入h-BN粉末显着减小了PyC的尺寸和基体热收缩的各向异性，随着h-BN含量的增加，环缺陷逐渐消失。此外，由于更高质地的 PyC 和更粗糙的纤维表面，纤维和基体之间的界面结合得到了增强。由此可见，随着BN粉末含量的增加，所制备的复合材料的弯曲强度和模量先下降后上升，而冲击韧性则呈现下降趋势。此外，随着h-BN含量的增加，压缩性能的各向异性减弱，C/C-BN复合材料的压缩强度始终高于纯C/C复合材料。然而，当C/C复合材料采用13.5vol%含量的h-BN改性时，C/C-BN复合材料中出现了过多的松散BN聚集体，导致抗压强度略有下降。
Hexagonal boron nitride (h-BN) powders were introduced into carbon fiber preform by powder addition and subsequent combined with chemical vapor infiltration (CVI) for densification to prepare carbon fiber reinforced/carbon and boron nitride dual matrix composites (C/C-BN). Microstructures and mechanical properties of C/C composites with three different volume contents of h-BN powders were investigated in comparison to pure C/C composites. Results indicated that the introduction of h-BN powders into C/C composites significantly reduced the size of PyC and the anisotropy of thermal contraction in matrix, leading to a gradual disappearance of ring defects as the h-BN content increased. In addition, an enhanced interfacial bonding between fiber and matrix obtained due to higher-textured PyC and rougher fiber surface. Thereby, the flexural strengths and modulus of as-prepared composites decreased firstly and then increased, while the impact toughness presented a decreasing tendency as the content of BN powders increased. Furthermore, with the increasing of h-BN content, anisotropies of compressive properties were weakened, and the compressive strength of C/C-BN composites were always higher than that of pure C/C composit. However, when C/C composites modified by 13.5 vol% content of h-BN, excessive loose BN aggregates appeared in C/C-BN composites, leading to a relatively slight reduction of compressive strength.
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