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Mechanical and thermal conduction properties of carbon/carbon composites with different carbon matrix microstructures
New Carbon Materials ( IF 5.7 ) Pub Date : 2020-11-13 , DOI: 10.1016/s1872-5805(20)60511-x
Xia Liu , Hai-liang Deng , Jin-huang Zheng , Ming Sun , Hong Cui , Xiao-hu Zhang , Guang-sheng Song

Four carbon/carbon composites with densities of 1.75–1.81 g/cm3were produced with matrix carbons derived from (a)coal tar pitch and furfural acetone resin by impregnation-carbonization, (b) natural gas by isothermal chemical vapor infiltration and (c) xylene by film-boiling chemical vapor infiltration. Theirmechanical properties and thermal conductivities (TC) were compared and correlated to the matrix carbon microstructures. Results showed that the strength of the composites decreased as thecarbon matrix changed from natural gas pyrocarbon (PyCN), to resin-derived carbon, to xylene PyC (PyCX), and to pitch-derived carbon. The highest flexural and interlaminar shear strengths of 208.7 and 26.4MPa, respectively, were obtained for the PyCN matrix. The large amount of fiber pull-out and step-like matrix fracture contributed to a high toughness of composites with PyCN and PyCX matrices. Relatively low strength and toughness were obtained for the pitch-derived carbon. The change of TC with the matrix type was consistent with the graphitization degree and apparent crystallite height. The highest in-plane and out-of-plane TC reached 148.2 and 75.4 W/(m·K), respectively, for the PyCX matrix, which was due to its carbon layers having the highest preferred orientation. The chaotic structure and large number of defects of the resin-derived carbon produced a relatively low TC. PyCN was the most suitable matrix for composites with excellent mechanical properties. PyCXshould be used to improve the TC and toughness of the low-cost composites.



中文翻译:

具有不同碳基体微观结构的碳/碳复合材料的机械和导热性能

产生四种密度为1.75–1.81 g / cm 3的碳/碳复合材料,其中的基质碳来自(a)煤焦油沥青和糠醛丙酮树脂,通过浸渍碳化,(b)天然气通过等温化学气相渗透和(c )二甲苯通过沸腾化学蒸气渗透。比较了它们的机械性能和热导率(TC),并将其与基体碳微结构相关联。结果表明,复合材料的强度随着碳基质从天然气热碳(PyC N),树脂衍生的碳,二甲苯PyC(PyC X)和沥青衍生碳的变化而降低。PyC N的最高弯曲强度和层间剪切强度分别为208.7和26.4MPa矩阵。大量的纤维拉出和阶梯状基体断裂导致具有PyC N和PyC X基质的复合材料具有较高的韧性。沥青来源的碳获得相对较低的强度和韧性。TC随基质类型的变化与石墨化程度和表观微晶高度一致。PyC X基质的最高面内TC和面外TC分别达到148.2和75.4 W /(m·K),这是由于其碳层具有最高的优选取向。树脂衍生的碳的混沌结构和大量缺陷产生了相对较低的TC。PyC N是具有优异机械性能的复合材料的最合适基质。吡咯X应该用于提高低成本复合材料的TC和韧性。

更新日期:2020-11-13
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