Effect of B4C on the microstructure and properties of B4C modified three-dimensional needled C/C-SiC composites
Effect of B4C on the microstructure and properties of B4C modified three-dimensional needled C/C-SiC composites
复制标题
B4C对B4C改性三维针刺C/C-SiC复合材料微观结构和性能的影响
DOI：
10.1016/j.msea.2017.09.008
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Laifei Cheng
中科院分区：
文献类型：
--
作者：
Shangwu Fan;Liuyang He;Chang Yang;Heng Li;Sheng Wang;Yanggang Lin;Bihui Zou;Juanli Deng;Litong Zhang;Laifei Cheng
采用浆料浸渗法（SI）将B4 C引入三维碳纤维预制体中，并结合化学气相浸渗（CVI）和液态硅浸渗（LSI）工艺制备了B4 C改性C/C-SiC复合材料（C/C-B4 C-SiC）。研究了C/C-B4 C-SiC复合材料的显微结构、抗氧化性能、力学性能和热物理性能。结果表明，B4 C主要分布在纤维表面附近，针刺纤维、短切纤维网层和非织造布层纤维束外侧。C/C-B4 C-SiC具有良好的抗氧化性能，因为B4 C容易氧化为B2 O3，生成的B2 O3可以填充孔隙和裂纹等缺陷，防止氧化。C/C-B_4C-SiC复合材料的抗弯强度、断裂韧性和热容量均比C/C-SiC复合材料高得多。B4 C既能增强与纤维的界面结合，又能起到陶瓷颗粒增强的作用。此外，B4 C具有比C、Si或SiC更高的热容量，从而增加C/C-B4 C-SiC的热容量。
The B4C were introduced into three-dimensional carbon fiber preform by slurry infiltration (SI), then combined with chemical vapor infiltration (CVI) and liquid silicon infiltration (LSI) to get the B4C modified C/C-SiC composites (C/C-B4C-SiC). The microstructures, oxidation resistance, mechanical and thermal physical properties of the C/C-B4C-SiC were investigated. The results indicated that B4C distributed near the fiber surface and mainly in the region of the needle punched fibers, short-cut fiber web layer, and outside of the fiber bundle in non-woven layer. The C/C-B4C-SiC possessed good oxidation resistance for B4C was easy to oxidize into B2O3and the product B2O3could fill in the defects such as pores and cracks to prevent the oxidation. The flexural strength, fracture toughness, and thermal capacity of the C/C-B4C-SiC were much higher than those of the C/C-SiC. The B4C both can enhance the interface combination with fibers and act as ceramic particles reinforcement. In addition, B4C had higher thermal capacity than C, Si or SiC to increase the thermal capacity of the C/C-B4C-SiC.