Author/Authors :
Huang, Li-na Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Ma, Deng-hao Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Jin, En-ze Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Li, Jun-ping Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Sun, Xin Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Fang, Jin-ming Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Gong , Xiao-dong Science and Technology of Advanced Functional Composite Materials Laboratory - Aerospace Research Institute of Materials &Processing Technology - Beijing , China , Hou, Zhen-hua Jiangxi Jiajie Xinda New Materials Technology - Nanchang , China , Yin, Jian State Key Lab of Powder Metallurgy - Central South University - Changsha , China
Abstract :
Continuous silicon carbidefiber-reinforced silicon carbide ceramic matrix composites (SiCf/SiC) are promising as thermalstructural materials. In this work, the microstructure and static mechanical properties of 3D-SiCf/SiC with PyC, SiC, andPyC/SiC and without an interface prepared via polymer infiltration and pyrolysis (PIP) were investigated systematically in thispaper. The results show that the microstructure and static mechanical properties of SiCf/SiC with an interphase layer weresuperior to the composites without an interlayer, and the interface debondings are existing in the composite without aninterphase, resulting in a weak interface bonding. When the interphase is introduced, the interfacial shear strength is improved,the crack can be deflected, and the fracture energy can be absorbed. Meanwhile, the shear strength of the composites with PyCand PyC/SiC interfaces was 118 MPa and 124 MPa, respectively, and showing little difference in bending properties. Thisindicates that the sublayer SiC of the PyC/SiC multilayer interface limits the binding state and the plastic deformation of PyCinterphase, and it is helpful to improve the mechanical properties of SiCf/SiC.
Keywords :
Mechanical Properties , Failure Behavior , 3D-SiCf/SiCComposites , Different Interphases , SiCf/SiC
