Microstructure, mechanical properties and reaction mechanism of KD-1 SiCf/SiC composites fabricated by chemical vapor infiltration and vapor silicon infiltration

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 6; pp. 2441 - 2445
• Main Authors: Honglei, Wang, Xingui, Zhou, Jinshan, Yu, Yingbin, Cao, Rongjun, Liu
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.03.2011; Elsevier
• Subjects: Ceramic fiber reinforced ceramics; Chemical vapor infiltration; Composites; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Diffusion; Exact sciences and technology; Infiltration; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Microstructure; Physics; Porosity; Reaction mechanism; SiC; Silicon carbide; Three dimensional; Vapour; Mechanical properties; Reaction mechanism; Composites; SiC; Microstructure; Scanning electron microscopy; Open cell porosity; Fiber reinforced material; Displacement(deformation); Fracture toughness; Silicon carbide; Composite materials; Chemical vapor infiltration; Fractography; Bending test
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.12.028

▶ The microstructure of the resulting KD-1 SiCf/SiC composites. ▶ The mechanical properties of the resulting KD-1 SiCf/SiC composites. ▶ The diffusion mechanism for the VSI process. Three-dimensional (3D) KD-1 silicon carbide fiber reinforced silicon carbide matrix (KD-1 SiCf/SiC) composites were fabricated by a combining chemical vapor infiltration (CVI) and vapor silicon infiltration (VSI) process. The microstructure and mechanical properties of the resulting KD-1 SiCf/SiC composites were studied. The results show that the resulting SiCf/SiC composites have high bulk density and low open porosity (<6%). The mechanical properties of the resulting SiCf/SiC composites firstly increase and then decrease with decreasing the open porosity of the SiCf/C composites. The KD-1 SiC fibers were not severely deformed and adhered to the matrix with a weak interface during the VSI process. As a result, the composites exhibit non-catastrophic failure behavior. Additionally, the diffusion mechanism for the VSI process was also investigated in our work.