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Journal of Advanced Ceramics 2019, 8(1): 121-132 https://doi.org/10.1007/s40145-018-0300-6
Research Article | Open Access | Issue | Published: 13 March 2019

Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs

Show Author's Information Ning LIAOa,b( ),  Dechang JIAa,b( ),  Zhihua YANGa,b,  Yu ZHOUa,b
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Ministry of Industry and Information Technology, Harbin 150080, China
Keywords:
mechanical properties, Si2BC3N ceramics, SiC coated MWCNTs, thermal shock resistance
Cite this article:
LIAO N, JIA D, YANG Z, et al. Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs. Journal of Advanced Ceramics, 2019, 8(1): 121-132. https://doi.org/10.1007/s40145-018-0300-6
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Abstract Full text About this article

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 ℃. 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.


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About this article

Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs

Show Author's information Ning LIAOa,b( ), Dechang JIAa,b( ), Zhihua YANGa,b, Yu ZHOUa,b
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
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 ℃. 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: mechanical properties, Si2BC3N ceramics, SiC coated MWCNTs, thermal shock resistance

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Publication history

Received: 01 July 2018
Revised: 09 October 2018
Accepted: 16 October 2018
Published: 13 March 2019
Issue date: March 2019

Copyright

© The author(s) 2019

Acknowledgements

This work was supported financially by National Natural Science Foundation of China (NSFC, Grant Nos. 51702065 and 51621091) and China Postdoctoral Science Foundation (Grant No. 2018M631924).

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