Tsinghua University Press
Beijing
Tsinghua University Press, co-published with Springer
40145
10.1007/40145.2227-8508
2226-4108
2227-8508
35019314
Journal of Advanced Ceramics
J Adv Ceram
Materials Science
Ceramics, Glass, Composites, Natural Materials
Characterization and Evaluation of Materials
Nanotechnology
Structural Materials
Chemistry and Materials Science
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10.1007/s40145-018-0300-6
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Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs
Research Article
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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
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40145
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Ning
Liao
2008beijing.ln@163.com
Dechang
Jia
dcjia@hit.edu.cn
Zhihua
Yang
Yu
Zhou
0000 0001 0193 3564
grid.19373.3f
Institute for Advanced Ceramics, School of Materials Science and Engineering
Harbin Institute of Technology
Harbin
150080
China
0000 0004 0605 0826
grid.424018.b
Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology
Ministry of Industry and Information Technology
Harbin
150080
China
Abstract
Bulk Si2BC3N ceramics were reinforced with SiC coated multi-walled carbon nanotubes (MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si2BC3N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength (532.1 MPa) and fracture toughness (6.66 MPa·m1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si2BC3N ceramics maintains much higher residual strength (193.0 MPa) after thermal shock test at 1000 °C. The enhanced properties should be attributed to: (1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation; (2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the “pull out” of MWCNTs.
Keywords
Si2BC3N ceramics
SiC coated MWCNTs
mechanical properties
thermal shock resistance
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