Preparation of ZrB2-based nanocomposites with limited grain growth by means of low-temperature hot-pressing using Cu additive

Rujie He; Xinghong Zhang; Ping Hu; Wenbo Han

doi:10.3139/146.110948

Article

Preparation of ZrB₂-based nanocomposites with limited grain growth by means of low-temperature hot-pressing using Cu additive

Rujie He , Xinghong Zhang , Ping Hu and Wenbo Han

Published/Copyright: October 18, 2013

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From the journal International Journal of Materials Research Volume 104 Issue 10

Abstract

The purpose of the present study is to prepare ZrB₂-based nanocomposites with limited or no obvious grain growth. For ZrB₂ nanoparticles, the densification on-set temperature was about 1300°C, whereas the obvious grain growth on-set temperature for ZrB₂ nanoparticles was found to be about 1500°C. Therefore, there was a temperature “window” 1300–1500°C where ZrB₂ nanoparticles could be densified with limited or no grain growth. In this study, densification of ZrB₂-based nanocomposite was finally realized by means of low-temperature hot-pressing at 1450°C for 60 min under a uniaxial pressure of 30 MPa using Cu as a sintering additive. After hot-pressing, the grain growth of ZrB₂ nanoparticles was greatly suppressed, and the average grain size for ZrB₂ was only 310 nm. The microstructure and mechanical properties were examined, and the flexural strength and fracture toughness were 472.8 ± 36.4 MPa and 12.4 ± 0.5 MPa · m^1/2, respectively. We believe this paper can lay the foundation for the preparation of ZrB₂-based nanocomposites.

Keywords:: Nanocomposite; Grain growth; Microstructure; Mechanical properties; Hot-pressing

* Correspondence address, Rujie He, National Key Laboratory of Science and Technology on Advanced, Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, P. R. China, Tel./Fax: +86-451-86403016, E-mail: herujie2003jci@163.com

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Received: 2012-8-29

Accepted: 2013-3-25

Published Online: 2013-10-18

Published in Print: 2013-10-10

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https://doi.org/10.3139/146.110948

Keywords for this article

Nanocomposite; Grain growth; Microstructure; Mechanical properties; Hot-pressing