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Applied Composite Materials

, Volume 25, Issue 2, pp 415–423 | Cite as

Mechanical Properties and Thermal Shock Resistance Analysis of BNNT/Si3N4 Composites

  • Shouren Wang
  • Gaoqi Wang
  • Daosheng Wen
  • Xuefeng Yang
  • Liying Yang
  • Peiquan Guo
Article

Abstract

BNNT/Si3N4 ceramic composites with different weight amount of BNNT fabricated by hot isostatic pressing were introduced. The mechanical properties and thermal shock resistance of the composites were investigated. The results showed that BNNT-added ceramic composites have a finer and more uniform microstructure than that of BNNT-free Si3N4 ceramic because of the retarding effect of BNNT on Si3N4 grain growth. The addition of 1.5 wt.% BNNT results in simultaneous increase in flexural strength, fracture toughness, and thermal shock resistance. The analysis of the results indicates that BNNT brings many thermal transport channels in the microstructure, increasing the efficiency of thermal transport, therefore results in increase of thermal shock resistance. In addition, BNNT improves the residual flexural strength of composites by crack deflection, bridging, branching and pinning, which increase the crack propagation resistance.

Keywords

Microstructure BNNT Si3N4 Mechanical property Thermal shock resistance 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of P.R. China for the financial support (ID: 51372101, 51405195), Distinguished Middle-Aged and Young Scientist Encourage and Reward Foundation of Shandong Province (ID: ZR2016EMB01) and Taishan Scholar Engineering Special Funding (2016-2020).

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Shouren Wang
    • 1
  • Gaoqi Wang
    • 1
  • Daosheng Wen
    • 1
  • Xuefeng Yang
    • 1
  • Liying Yang
    • 1
  • Peiquan Guo
    • 1
  1. 1.School of mechanical engineeringUniversity of JinanJinanChina

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