Effect of initial density on thermal conductivity of new micro‐pipeline heat conduction C/SiC composites,Journal of the American Ceramic Society

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Effect of initial density on thermal conductivity of new micro‐pipeline heat conduction C/SiC composites
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-09-14 , DOI: 10.1111/jace.17475
Yunhai Zhang ₁ , Yongsheng Liu ₁ , Yejie Cao ₁ , Liyang Cao ₁ , Jing Wang ₁ , Yu Pan ₂ , Ning Wang ₂

Affiliation

C/SiC composites prepared by chemical vapor infiltration technique (CVI) have been regarded as thermal structural materials widely. However, these composites still suffer from poor functional properties like low thermal conductivity, especially in thickness direction of the composites, limiting their large‐scale applications. Herein, mesophase pitch based carbon fiber (MPCF) and continuous wave laser machining were utilized to construct highly effective heat conductive micro‐pipelines within CVI C/SiC composite. The effect of initial density on the final density and thermal conductivity of the as‐obtained MPCF‐C/SiC composites were investigated. The results revealed that higher initial density would directly enhance the thermal conductivity and reduce the negative impact of the bottle‐neck effect. At temperatures between 100°C and 500°C, MPCF‐C/SiC composites preserved more than threefold of the thermal conductivity (340%) when compared to reference C/SiC composites. This work provides a highly effective route for enhancing the thermal conductivity of C/SiC, which would broaden their future applications.

中文翻译：

初始密度对新型微管道导热C / SiC复合材料导热系数的影响

通过化学气相渗透技术（CVI）制备的C / SiC复合材料已被广泛认为是热结构材料。但是，这些复合材料仍具有较差的功能特性，例如低导热率，特别是在复合材料的厚度方向上，从而限制了它们的大规模应用。在这里，中间相沥青基碳纤维（MPCF）和连续波激光加工被用来在CVI C / SiC复合材料中构建高效的导热微管道。研究了初始密度对最终获得的MPCF-C / SiC复合材料的最终密度和导热率的影响。结果表明，较高的初始密度将直接提高热导率并减少瓶颈效应的负面影响。在100°C至500°C之间的温度下，与参比C / SiC复合材料相比，MPCF-C / SiC复合材料保留的导热率是其三倍以上（340％）。这项工作为增强C / SiC的导热性提供了一条有效途径，这将拓宽其未来的应用范围。

更新日期：2020-11-22

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