利用刷涂法将石墨烯/SiC浆料引入SiC纤维布层之间,经模具夹持再化学气相渗透SiC后,制备石墨烯改性SiCf/SiC复合材料。利用扫描电镜、三点弯曲测试以及激光热导仪等深入研究浆料中石墨烯的质量分数对SiCf/SiC复合材料微观结构、力学性能和导热性能的影响。结果表明,浆料中石墨烯质量分数为2%时,石墨烯分布最均匀,SiCf/SiC复合材料的热导率最高,为13.14 W/(m·K);随浆料中石墨烯质量分数增加,石墨烯开始团聚,材料致密度下降,热导率随之下降。当石墨烯质量分数为4%时,石墨烯虽出现一定程度团聚,但石墨烯团聚体仍与基体有良好的结合,复合材料具有最高抗弯强度,为328.12 MPa。
In this paper, graphene contained SiCf/SiC composites were prepared by a two-step process, with graphene/SiC slurry introduced by slurry brushing first, then followed a chemical vapor infiltration of SiC matrix. The effects of graphene mass fraction in the slurry on the microstructure, mechanical properties and thermal conductivity of SiCf/SiC composites were studied by using scanning electron microscopy, three-point bending test and laser flash apparatus. The results show that, when the mass fraction of graphene is 2%, the distribution of graphene in the slurry layer is uniformly, resulting in the highest thermal conductivity of 13.14 W/(m·K) of the composites. With the increase of the mass fraction, the distribution of graphene in the slurry layer is deteriorated, which leads to a decrease of the density and thermal conductivity of SiCf/SiC composites. However, although graphene begins to agglomerate at a mass fraction of 4%, the composites possess the highest flexural strength of 328.12 MPa, due to the well bonding between graphene and the SiC matrix.
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