Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 14, Pages 4614-4622Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.06.030
Keywords
Boron nitride nanotubes; Hierarchical composites; Interphase; Acoustic emission; Damage evolution
Categories
Funding
- National Key Research and Development Program of China [2016YFB0700202]
- National Natural Science Foundation of China [51502323, 51772310]
- Science and Technology Commission of Shanghai Municipality [16DZ2260600]
- Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics [SKL201601]
- Chinese Academy of Science [QYZDY-SSW-JSC031]
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As-grown and BN-coated boron nitride nanotubes (BNNTs) were incorporated into SiCf/SiC composites to produce nanotube-based hierarchical composites. In-depth studies on damage evolution reveal that early damage development are delayed owing to the restriction effects on crack propagations from as-grown and BNcoated BNNTs. Moreover, this delay effect is more pronounced from BN-coated BNNTs because BN-coated BNNTs/matrix interfacial bonding strength is low. Final failure of composites with as-grown BNNTs still comes much earlier compared with virgin composite due to strong fibers/matrix bonding enhanced by as-grown BNNTs. This premature final failure is remedied in large part in composites with BN-coated BNNTs because fibers/matrix bonding enhanced by as-grown BNNTs is weaken after the deposition of an interphase on nanotube surface. Additionally, the type, the number and the released energy level of damage mechanisms during the whole damage evolution after the incorporation of as-grown and BN-coated BNNTs were also discussed elaborately compared with virgin composite.
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