Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 10, Pages 2535-2541Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.03.011
Keywords
Thermal shock; Joining; Interfaces; Nanowires
Categories
Funding
- National Natural Science Foundation of China [51221001, 51222207]
- 111 Project [B08040]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201036]
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In order to improve the bonding property of joint between SiC modified carbon/carbon (C/C) composites and Li2O-Al2O3-SiO2 (LAS) glass ceramics, SiC nanowires were attempted as the reinforcement materials in the interface region of SiC transition layer and Li2O-MgO-Al2O3-SiO2 (LMAS) gradient joining interlayer. The C/C LAS joint with SiC nanowire-reinforced interface layer was prepared by a three-step technique of pack cementation, in situ reaction and hot-pressing. The microstructure and thermal shock resistance of the as-prepared joints were examined. The average shear strength of the joined samples with SiC nanowires increased from 24.9 MEPa to 31.6 MPa after 40 thermal cycles between 1000 degrees C and room temperature, while that of the joined samples without SiC nanowires dropped from 21.4 MPa to 8.3 MPa. The increase of thermal shock resistance of the C/C LAS joints was mainly attributed to the toughening mechanism of SiC nanowires by pullout, bridging and crack deflection. (C) 2014 Elsevier Ltd. All rights reserved.
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