The development of efficient and quick method to prepare structure-function integrative C/SiC composites is always a major challenge in this field. Herein, the thermal conductivity and bending strength of C/SiC composites were enhanced simultaneously via continuous high heat conductive channels constructed by continuous wave laser machining and pitch-based high thermal conductivity carbon fiber in thickness direction. Results revealed that the thermal conductivity of the modified C/SiC composites is three times higher than that of referential C/SiC composites due to its highly ordered heat conducive channel in the thickness direction. Importantly, the bending strength of modified C/SiC composites increased to 457 MPa. To better understand the enhance mechanism, the micro-structure for both the composites and heat conductive channel was systematically analyzed. The results demonstrated that the rivet effect of heat conductive channel and the formed two phases structure on the fibers dispersed partial of load and finally enhanced the property of the composites. In a word, this method holds a nice applicable future in constructing structure-function integrative C/SiC composites.

开发高效快速的结构-功能一体化C/SiC复合材料的制备方法一直是该领域的主要挑战。在此，通过连续波激光加工和沥青基高导热碳纤维在厚度方向上构建的连续高导热通道同时增强了C/SiC复合材料的导热性和弯曲强度。结果表明，由于其在厚度方向上高度有序的导热通道，改性 C/SiC 复合材料的热导率是参考 C/SiC 复合材料的三倍。重要的是，改性 C/SiC 复合材料的弯曲强度增加到 457 MPa。为了更好地理解增强机制，系统地分析了复合材料和导热通道的微观结构。结果表明，导热通道的铆钉效应和在纤维上形成的两相结构分散了部分载荷，最终提高了复合材料的性能。总之，该方法在构建结构-功能一体化的C/SiC复合材料方面具有很好的应用前景。