Pyrocarbon is uniformly deposited on the surface of fibers during densification and it is the changes of the ration AS/VR that leads to variation of pyrocarbon microstructures.

• 在致密化过程中，热解炭均匀沈积在纤维表面，预制体AS/VR比值变化是导致热解炭微观结构发生改变的根本原因。