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Journal of Advanced Ceramics

, Volume 8, Issue 1, pp 121–132 | Cite as

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

  • Ning LiaoEmail author
  • Dechang JiaEmail author
  • Zhihua Yang
  • Yu Zhou
Open Access
Research Article
  • 31 Downloads

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 

Notes

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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Authors and Affiliations

  1. 1.Institute for Advanced Ceramics, School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing TechnologyMinistry of Industry and Information TechnologyHarbinChina

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