预制体结构对SiCf/SiC复合材料力学和热性能的影响

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中文摘要：本文采用化学气相渗透法制备了具有二维多层、三维角联锁机织和多轴三维编织三种预制体结构的SiCf/SiC复合材料。在综合分析纤维排列、SiC基体和孔隙分布的基础上，详细讨论了预制体结构对SiCf/SiC复合材料力学性能和热性能的影响。结果表明，复合材料的力学性能和热导率受纤维排列方式和复合材料密度的综合影响，而热膨胀系数主要受纤维排列方式的影响。此外，二维多层复合材料、三维角联锁机织复合材料和多轴三维编织复合材料的热导率可以分别用串联模型和平行模型来解释。多轴三维编织复合材料由于内部具有连续的可以作为热流快速通道的三维网状SiC基体层，因此具有较高的室温热导率。而随着温度的升高，SiC声子间的散射逐渐增强，SiC基体层在多轴三维编织复合材料中作为声子传播快速通道的作用逐渐减弱，热导率随温度降低的趋势更明显。

外文标题：Effect of preform structure on mechanical and thermal properties of SiCf/SiC composites

外文摘要：In this paper,SiCf/SiC composites with three kinds of preform structures,namely 2D multilayered,3D angle-interlock and multiaxis 3D braided,were prepared by chemical vapor infiltration.The influences of preform structure on mechanical and thermal properties of SiCf/SiC composites were discussed in detail,on the basis of comprehensive analyses of fiber arrangement,SiC matrix and pore distribution,and so on.The results show that the mechanical properties and thermal conductivity are comprehensively affected by the fiber arrangement and the density of composites,while the coefficient of thermal expansion is mainly influenced by the fiber arrangement.In addition,the thermal conductivity of 2D multilayered,3D angle-interlock and multiaxis 3D braided composites could be explained by series model and parallel model,respectively.The continuous three-dimensional network structure of SiC matrix layer inside multiaxis 3D braided composites could be regarded as a fast channel for heat flow,resulting in a higher thermal conductivity.As the temperature increases,the scattering between phonons gradually increases and becomes the main factor affecting the thermal conductivity.In this case,the role of the SiC matrix layer as a fast channel for phonon propagation in multiaxis 3D braided composites gradually weakens.

外文关键词：

preform structureflexural strengththermal conductivitycoefficient of thermal expansionSiCf/SiC composites

作者：

王徐辉、吴宗绪、陈招科、伍艳、熊翔

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作者单位：

Science and Technology on High Strength Structural Materials Laboratory,Central South University,Changsha 410083,China

State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

关键词：

预制体结构抗弯强度热导率热膨胀系数 SiCf/SiC复合材料

基金：

National Defense Pre-Research Foundation of ChinaKey Laboratory for Lightweight High Strength Structural Materials,Central South University,China

项目编号：

6142907200301

出版年：

2024

DOI：

10.1007/s11771-023-5495-1

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDEI

影响因子：0.47

ISSN：2095-2899

年,卷(期)：2024.31(1)

参考文献量35