Micro-defects of 3D-Cf/Al Composites by Vacuum Pressure Infiltration

作者：Nie Mingming^*; Xu Zhifeng; Yu Huan; Wang Zhenjun; Zhou Zhenzhen; Cai Changchun

来源：Rare Metal Materials and Engineering, 2018, 47(4): 1266-1274.

• 3D-woven
• C-f/Al composites
• fiber preheating temperature
• braided structure
• micro-defect

The vacuum gas pressure infiltration was performed to prepare 3D five-directional and 3D orthogonal braided performs woven by M40 graphite fiber composite (3D-C-f/Al) with the volume fraction of 51% and the density higher than 97%. The morphology and formation mechanism of micro-defects and control measures were analyzed, and the effects of braiding structures on micro-defect formation were compared. Results show that the defects in the composite are micron grade micro-defects, including pores within the fiber beam and partial fiber reunited, cold shut, microscopy shrinkage cavity and small inclusion in the substrate concentration. The 3D orthogonal composite has less pores between the fiber beam and pores within the fiber beam than the 3D five-directional composite, while the fiber reunited phenomenon of 3D orthogonal composite is more serious than that of 3D five-directional composite. The main reason for the different defects is braided structure distinctions. Increasing the fiber preheating temperature could effectively reduce the internal pores defect and partial fiber reunited phenomenon.

• 出版日期2018-4
• 单位南昌航空大学