Microstructure and mechanical properties of h-BN/Yb4Si2O7N2 composites

Juanjuan CHEN; Jixin CHEN; Hao ZHANG; Minmin HU; Meishuan LI

doi:10.1007/s40145-018-0281-5

Journal of Advanced Ceramics 2018, 7(4): 317-324 https://doi.org/10.1007/s40145-018-0281-5

Research Article |

Open Access | Issue | Published: 21 November 2018

Microstructure and mechanical properties of h-BN/Yb₄Si₂O₇N₂ composites

Show Author's Information Hide Author's Information Juanjuan CHEN^{^a^,^b}, Jixin CHEN^{^a}(

), Hao ZHANG^{^a^,^c}, Minmin HU^{^a^,^c}, Meishuan LI^{^a}

^a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China

^b University of Chinese Academy of Sciences, Beijing, China

^c School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, China

Keywords:

microstructure, mechanical properties, h-BN/Yb₄Si₂O₇N₂ composites, machinability

Cite this article:

CHEN J, CHEN J, ZHANG H, et al. Microstructure and mechanical properties of h-BN/Yb₄Si₂O₇N₂ composites. Journal of Advanced Ceramics, 2018, 7(4): 317-324. https://doi.org/10.1007/s40145-018-0281-5

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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·m^1/2, 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.

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Microstructure and mechanical properties of h-BN/Yb₄Si₂O₇N₂ composites

Show Author's information Hide Author's Information Juanjuan CHEN^{^a^,^b}, Jixin CHEN^{^a}(

), Hao ZHANG^{^a^,^c}, Minmin HU^{^a^,^c}, Meishuan LI^{^a}

^a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China

^b University of Chinese Academy of Sciences, Beijing, China

^c School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, China

Abstract

Keywords: microstructure, mechanical properties, h-BN/Yb₄Si₂O₇N₂ composites, machinability

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Publication history

Received: 28 March 2018

Revised: 06 May 2018

Accepted: 07 May 2018

Published: 21 November 2018

Issue date: December 2018

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Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://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.