期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 4, 页码 1139-1148出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.11.054
关键词
Ceramic-matrix composites (CMCs); Chemical vapour deposition (CVD); Mechanical properties; Fiber/matrix interfacial analysis; Thermal mismatch
资金
- National Natural Science Foundation of China [51802348]
The boron nitride (BN) interphase of silicon nitride (Si3N4) fiber-reinforced BN matrix (Si3N4f/BN) composites was prepared by chemical vapor deposition (CVD) of liquid borazine, and the microstructure, growth kinetics and crystallinity of the BN coating were examined. The effects of coating thickness on the mechanical strength and fiber/matrix interfacial bonding strength of the composites were then investigated. The CVD BN coating plays a key role in weakening the interfacial bonding condition that improves the mechanical properties of the composites. The layering structure of the BN coating promotes crack propagation within the coating, which leads to a variety of toughening mechanisms including crack deflection, fiber bridging and fiber pull out. Single-fiber push-out experiments were performed to quantify the fiber/matrix bonding strength with different coating thicknesses. The physical bonding strength due to thermal mismatch was discussed.
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