Superior mechanical properties of lithium aluminosilicate composites by pyrolytic carbon intercalated carbon fibers/carbon nanotubes multi-scale reinforcements
Superior mechanical properties of lithium aluminosilicate composites by pyrolytic carbon intercalated carbon fibers/carbon nanotubes multi-scale reinforcements
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DOI：
10.1016/j.ceramint.2021.08.180
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发表时间：
2021-08
影响因子：
5.2
通讯作者：
Pengyu Zhu;Chi Wang;Xinyu Wang;Hua Yang;Gui-liang Xu;Chunlin Qin;Li Xiong;G. Wen;L. Xia-L.-Xi
中科院分区：
文献类型：
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作者：
Pengyu Zhu;Chi Wang;Xinyu Wang;Hua Yang;Gui-liang Xu;Chunlin Qin;Li Xiong;G. Wen;L. Xia-L.-Xi
化学气相沉积（CVD）法制备的碳纤维/碳纳米管（CFs/CNTs）多尺度增强复合材料存在性能退化问题。在这项研究中，热解碳（PyC）中间层，以克服这个问题，并详细研究了其机制。将多尺度增强体与锂铝硅酸盐（LAS）玻璃陶瓷通过浆料浸渍和热压烧结结合成陶瓷基复合材料。结果表明，PyC中间层可以保护碳纤维免受高温下催化剂的腐蚀，改善应力传递，促进各组分之间的协同作用。碳纳米管和LAS基体形成一个过渡区，在裂纹扩展时产生偏转和分流。这些因素都大大提高了裂纹扩展能，因此力学性能得到了很大的提高。抗弯强度、断裂韧性和断裂功分别达到602 ± 55 MPa、10.7 ± 2 MPa m1/2、4.6 ± 0.7 kJ m-2，比CF/LAS高出42.3%、42.6%和76.9%。本工作拓展了碳纤维/碳纳米管多尺度增强体和LAS复合材料的研究领域，为相关研究提供了有益的参考。
Performance degradation always occurs in carbon fibers/carbon nanotubes (CFs/CNTs) multi-scale reinforced composites prepared by chemical vapor deposition (CVD) method. In this study, pyrolytic carbon (PyC) interlayers are introduced to overcome this problem, and the mechanism is studied in detail. The multi-scale reinforcements are combined with lithium aluminosilicate (LAS) glass-ceramic into ceramic matrix composites by slurry impregnation and hot pressing sintering. The results show that the PyC interlayers can protect the CFs from corrosion of the catalyst at high temperature, improve stress transfers and promote the synergy between various components. The CNTs and LAS matrix form a transition area, which causes deflection and shunting when cracks propagate. These factors have greatly increased the crack extension energy, so the mechanical properties have been greatly improved. The flexural strength, fracture toughness and work of fracture reach 602 ± 55 MPa, 10.7 ± 2 MPa m1/2, 4.6 ± 0.7 kJ m−2, respectively, which are 42.3%, 42.6% and 76.9% higher than CF/LAS. This work expands the study of the CFs/CNTs multi-scale reinforcements and the LAS composites, and provides a useful reference for the related research.