Poor thermal conductivity of continuous fiber-reinforced silicon carbide (SiC) ceramic matrix (C/SiC) composites has become a huge obstacle to be widely used as thermal protection systems and hot structures for hypersonic vehicles. Herein, a high thermal conductivity of C/SiC composites modified with SiC whiskers (SiCw) was constructed by laser-assisted chemical vapor infiltration (LA-CVI). The inserted SiCw into the C/SiC composites were served as the second phase, yielding a unique three-dimensional network structure. Density, mechanical properties, and thermal conductivity of the prepared composites were systematically investigated. Results show that the bending strength (600 MPa) of the LA-CVI-C/SiC-SiCw composites is 27.6% higher than that of CVI-C/SiC composites (470 MPa). With the fiber debonded, fractured, and pulled out hierarchically, the failure crack propagated express Step-extension. Besides, the thermal conductivity (45.13 Wm⁻¹K⁻¹) of LA-CVI-C/SiC-SiCw composites is a factor 4 to 5 higher than that of CVI-C/SiC composites (10 Wm⁻¹K⁻¹). This work provides not only a facile method to construct high thermal conductivity C/SiC composites but an effective way to overcome the difficulties of improving the thermal conductivity of ceramic matrix composites (CMCs).

连续纤维增强的碳化硅（SiC）陶瓷基体（C / SiC）复合材料的导热性差已成为被广泛用作高超音速车辆的热保护系统和热结构的巨大障碍。在此，通过激光辅助化学气相渗透（LA-CVI）构造了用SiC晶须（SiCw）改性的C / SiC复合材料的高导热性。插入到C / SiC复合材料中的SiCw被用作第二阶段，产生了独特的三维网络结构。系统地研究了所制备复合材料的密度，机械性能和导热系数。结果表明，LA-CVI-C / SiC-SiCw复合材料的抗弯强度（600 MPa）比CVI-C / SiC-SiCw复合材料（470 MPa）高27.6％。随着纤维的剥离，断裂和分层拉出，失效裂纹的扩展表示逐步扩展。此外，导热系数（45.13 WmLA-CVI-C / SiC-SiCw复合材料的^-1 K ^-1）比CVI-C / SiC复合材料（10 Wm ^-1 K ^-1）高4-1倍。这项工作不仅为构建高导热率的C / SiC复合材料提供了一种简便的方法，而且还为克服提高陶瓷基复合材料（CMC）的导热性的困难提供了一种有效的方法。