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材料工程  2013 

梯度分布TaC界面改性C/C复合材料的微观结构与力学性能

DOI: 10.3969/j.issn.1001-4381.2013.09.002, PP. 6-10

Keywords: C/C复合材料,界面,梯度分布,微观结构,力学性能

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Abstract:

利用化学气相渗透法在三维细编穿刺炭毡中的炭纤维表面沉积TaC陶瓷界面,通过控制气体在预制体中的流动方向,获得梯度分布TaC界面改性C/C复合材料。研究了材料的微观结构、弯曲性能以及断裂韧性,结果表明TaC呈层状分布在炭纤维表面,从C/C复合材料表层到内部,TaC陶瓷相的含量呈梯度分布;梯度分布TaC界面改性C/C复合材料的平均弯曲强度为272.6MPa,平均断裂韧性为5.0MPa·m1/2;整体上,沿材料厚度(Z轴)方向,随TaC含量的降低,纤维的拔出长度明显变短;在表层富TaC区,TaC含量对材料断裂行为有较大影响,其表现为在TaC含量较多的外层,材料断裂为脆性断裂,而在TaC含量较少的内层,材料断裂为假塑性断裂。

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