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Microstructure, mechanical properties and thermal shock resistance of ZrB2-SiC-Cf composite with inhibited degradation of carbon fibers
被引:60
作者:
Gui, Kaixuan
[1
]
Hu, Ping
[1
]
Hong, Wenhu
[2
]
Zhang, Xinghong
[1
]
Dong, Shun
[1
]
机构:
[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150001, Peoples R China
[2] China Acad Launch Vehicle Technol, Beijing 100000, Peoples R China
关键词:
Ceramic composites;
Fibers;
Mechanical properties;
Thermal shock resistance;
ZRB2-BASED CERAMICS;
ZRB2;
DENSIFICATION;
OXIDATION;
BEHAVIOR;
SIZE;
D O I:
10.1016/j.jallcom.2017.02.227
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
ZrB2-SiC-C-f composite with carbon coated carbon fibers was successfully prepared by low temperature hot pressing. This composite showed an excellent thermal shock resistance compared with those composites fabricated by hot pressing and spark plasma sintering using as-received carbon fibers. Toughening mechanisms such as crack deflection, crack branching, fibers pull-out and fibers bridging were obviously detected in ZrB2-SiC-C-f owing to the inhibited degradation of carbon fibers and the relatively weak fiber/matrix interfacial bonding, leading to a non-brittle fracture mode of the composite. Moreover, the composite exhibited an excellent thermal shock resistance with a high critical thermal shock temperature difference of 773 degrees C which is about twice those of the reported ZrB2-based ultra-high temperature ceramics. This work provides valuable guidance in the preparation of ZrB2-based ultra-high temperature ceramics with a combination of excellent properties. (C) 2017 Elsevier B.V. All rights reserved. .
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页码:16 / 23
页数:8
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