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Fabrication of high‐strength porous SiC‐based composites with unidirectional channels
Author(s) -
Cao Jiwei,
Lu Zhongliang,
Miao Kai,
Zhao Hongjiong,
Xia Yuanlin,
wang Fu,
Lu Bingheng
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16332
Subject(s) - materials science , composite material , microstructure , porosity , ceramic , fabrication , composite number , chemical vapor infiltration , compressive strength , ductility (earth science) , bending , flexural strength , creep , medicine , alternative medicine , pathology
Abstract Carbon fiber reinforced SiC‐based composites with unidirectional channels were obtained by freeze‐casting and chemical vapor infiltration techniques, and their microstructure and fracture behavior were investigated. The results indicated that the sizes of the unidirectional channels could be controlled in the 15‐70 μm range. The significant pseudo plastic and ductility features of the porous SiC‐based composite were demonstrated during the fracture process. The strains of the composites reached 4 ± 1% and 50 ± 6% during bending and compressive experiments, respectively. The bending and compressive strengths, 123 ± 20 and 99 ± 15 MPa, respectively, were far superior to those of homogeneous ceramics presenting the same porosity. Combining the aforesaid method with 3D printing techniques, a SiC‐based composite part with controlled macro‐micro channels was fabricated, which indicated that this method could be useful for fabricating ceramic parts with complex structure and superior mechanical performance.