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采用电沉积法与化学气相渗透(CVI)法将碳纳米管(CNTs)分别引入到碳纤维表面和SiC基体中,制得了不同物相电沉积CNTs的C/SiC复合材料(CNTs-C)/SiC和C/(CNTs-SiC)。研究了CNTs沉积物相对C/SiC复合材料力学性能的影响,分析了不同CNTs沉积物相的C/SiC复合材料的拉伸强度及断裂机制。结果表明:相较于未加CNTs的C/SiC复合材料,CNTs沉积到碳纤维表面的(CNTs-C)/SiC复合材料的拉伸强度提高了67.3%,断裂功提高了107.2%;而将CNTs引入到SiC基体中的C/(CNTs-SiC)复合材料的断裂功有所降低,拉伸强度也仅提高了6.9%,CNTs没有表现出明显的增强增韧效果;C/(CNTs-SiC)复合材料与传统的C/SiC复合材料有相似的断裂形貌特征,断裂拔出机制类似,主要为纤维增强增韧,CNTs的作用不明显。
Carbon nanotubes (CNTs) were introduced into the surface of carbon fiber and SiC matrix respectively by electrodeposition and chemical vapor infiltration (CVI), and CNTs-C / SiC composites with different phase electrodeposited CNTs And C / (CNTs-SiC). The influence of CNTs deposit on the mechanical properties of C / SiC composites was studied. The tensile strength and fracture mechanism of C / SiC composites with different CNTs deposition phases were analyzed. The results show that the tensile strength of CNTs-C / SiC composites deposited on CNTs increased by 67.3% and the work of rupture increased by 107.2% compared with the non-CNTs-added C / SiC composites. CNTs The tensile strength of C / (CNTs-SiC) composites introduced into the SiC matrix decreased only by 6.9%, CNTs did not show any significant strengthening and toughening effect. The C / (CNTs-SiC) The composite has the similar fracture morphology characteristics as the traditional C / SiC composites. The mechanism of fracture-pull-out is similar to that of the original C / SiC composites, which is mainly the fiber toughening and toughening. The effect of CNTs is not obvious.