The vacuum gas pressure infiltration was used to prepare the 3D-SiC

f

/Al composites with the volume fraction of 48%

of which the reinforced material adopted 3D five-directional braided performs woven by KD-Ⅱ SiC fiber with the holding pressure for 10 min

20 min

30 min

respectively.The effects of holding pressure time on microstructure and mechanical properties of 3D-SiC

f

/Al composites were analyzed.The results show that the average relative density of 3D-SiC

f

/Al composites is increased to 99.0% with the increase of holding pressure time

which is attributed to the holding pressure time effectively reducing the voids in the fiber bundle and fiber reunion.The tensile strength of 3D-SiC

f

/Al composites is increased firstly and then decreased with the increase of holding pressure time

which is attributed to the strong interfacial reaction deteriorating the mechanical properties of the composites.