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Interfacial optimization of SiC nanocomposites reinforced by SiC nanowires with high volume fraction
Author(s) -
Ruan Jing,
Yang Jinshan,
Dong Shaoming,
Yan Jingyi,
Zhang Xiangyu,
Ding Yusheng,
Zhou Haijun,
Hu Jianbao
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.16513
Subject(s) - interphase , materials science , composite material , nanocomposite , pyrolytic carbon , volume fraction , composite number , nanowire , fracture toughness , toughness , nanoindentation , pyrolysis , nanotechnology , chemical engineering , genetics , engineering , biology
High volume fraction SiC nanowires‐reinforced SiC composites (SiCNWs/SiC) were prepared by hybrid process of chemical vapor infiltration and polymer impregnation/pyrolysis in this research. SiCNWs networks are first to be made promising a high volume fraction (20 vol%), and the pyrolytic carbon (PyC) interphase with 5 nm is designed on SiCNWs surface to optimize the bonding condition between SiCNWs and SiC matrix. Nanoindentation shows a modulus of 494 ± 14 GPa of SiCNWs/SiC composites without interphase comparing to the one with PyC interphase of 452 ± 13 GPa. However, the 3‐point bending test shows a higher strength of the composite with PyC interphase (273 ± 32 MPa) comparing with the one without interphase (240 ± 38 MPa). The fracture surface is observed under SEM, which shows a longer SiCNWs pullout of the composite with PyC interphase. The energy dissipation during the 3‐point bending test is calculated by the length of nanowire pull‐out, it demonstrates that the SiCNWs with PyC interphase possess better performance for toughening composite. Further characterization proves that the PyC interphase can give SiCNWs/SiC composites higher fracture toughness (4.49 ± 0.44 MPa·m 1/2 ) than the composites without interphase (3.66 ± 0.28 MPa·m 1/2 ).