采用聚硅氧烷(PSO)先驱体浸渍裂解工艺制备出碳纤维三维编织物增强OSiC复合材料(3D-B Cf/OSiC).研究发现,第一周期采用热压辅助裂解可以显著提高材料的力学性能与致密度.第一周期经1600℃、10MPa的条件热压裂解处理5min后,材料的弯曲强度和断裂韧性从未处理前的246.2MPa和9.4MPa·m1/2提高到502MPa和23.7MPa·m1/2.该材料的弯曲强度在真空中可以保持到1400℃.探讨了工艺参数对材料结构与力学性能的影响.高温裂解弱化界面结合同时提高纤维就位强度以及加压提高材料致密度是热压辅助裂解能提高材料力学性能的主要原因.
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