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Journal of Advanced Ceramics

, Volume 7, Issue 4, pp 317–324 | Cite as

Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

  • Juanjuan Chen
  • Jixin ChenEmail author
  • Hao Zhang
  • Minmin Hu
  • Meishuan Li
Open Access
Research Article
  • 55 Downloads

Abstract

A series of h-BN based composites with Yb4Si2O7N2 as a secondary phase were successfully synthesized by an in situ reaction hot pressing method. It was found that the relative density and room-temperature mechanical properties monotonically increased with increasing the content of Yb4Si2O7N2 from 20 to 50 vol%. When 50 vol% Yb4Si2O7N2 was introduced, the relative density of the composite reached 98.75%, and its flexural strength, compressive strength, fracture toughness, and hardness reached 338±10 MPa, 803±49 MPa, 2.06±0.06 MPa·m1/2, and 2.69±0.10 GPa, respectively. The strengthening effect of Yb4Si2O7N2 was mainly attributed to its high modulus and high hardness. Fine microstructure was also advantageous to strength and could lead to more tortuous crack propagation paths and then improve the fracture toughness of the composites simultaneously. Meanwhile, the composites maintained good machinability.

Keywords

h-BN/Yb4Si2O7N2 composites microstructure mechanical properties machinability 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 50802099 and 51072201.

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© The Author(s) 2018

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (https://doi.org/creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made

Authors and Affiliations

  • Juanjuan Chen
    • 1
    • 2
  • Jixin Chen
    • 1
    Email author
  • Hao Zhang
    • 1
    • 3
  • Minmin Hu
    • 1
    • 3
  • Meishuan Li
    • 1
  1. 1.Shenyang National Laboratory for Materials Science, Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyangChina

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