中文摘要：

采用薄膜沸腾气相沉积（film—boilingchemicalvaporinfiltration，FBCVI）工艺，制备原位碳纳米纤维增强碳／碳复合材料（carbonnanofibersreinforcedcarbon／carboncomposites，CNFs-C／C））。研究了致密化过程中CNFs的生长情况和催化剂的引入对材料组织结构和力学性能的影响。研究表明，致密化前期，原位生长CNFs困难；随着沉积时间延长，CNFs大量增多并被碳基体包覆，CNFs主要为碳纳米线（carbonnanowires，CNWs）。CNFs—C／C的碳基体结构为粗糙层（RL），且存在大量的生长锥。相比于未加催化剂的试样，CNFs-C／C的弯曲强度和模量分别提高了30．9％和39．1％，断裂模式为假塑性断裂。

英文摘要：

In-situ grown carbon nanofibers reinforced carbon/carbon （CNFs-C/C） composites were prepared by catalyze film-boiling chemical vapor infiltration （FBCVI）. After investigating the growing process of CNFs, the in- fluence of catalyst on microstructure and mechanical properties of C/C composites was studied in this paper. The re- suits show that the growth of CNFs at the beginning of deposition was very difficult. As the deposition time in- creased, the number of CNFs increased sharply. The CNFs were wrapped by PyC matrix after deposition process. The PyC type was RL with a great quantity of cone-shaped PyC. The mechanical strength and modulus of CNFs-C/ C composites increased by 30.9% and 39.1% respectively C/C composites is pseudo plastic fracture. , compared to the pure one. The fracture mode of CNWs-