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Journal of Materials Science
Published in: Journal of Materials Science 6/2018

28-11-2017 | Ceramics

Effects of VC additives on densification and elastic and mechanical properties of hot-pressed ZrB2–SiC composites

Author: Shuqi Guo

Published in: Journal of Materials Science | Issue 6/2018

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Abstract

In this study, highly dense ZrB2-20 vol% SiC composites with 3–10 wt% VC additives were prepared by hot-pressing at 1750 °C for 1 h under a pressure of 20 MPa in a vacuum. The densification behavior and elastic and mechanical properties of the obtained composites were examined, and the effect of the VC content on the densification and the properties is analyzed. The addition of VC promotes the activation of densification mechanism at a lower temperature and inhibits the growth of ZrB2 and SiC grains during the sintering. In addition, the elastic moduli, hardness and fracture toughness that measured in the obtained composites are constant and independent of the VC content, with a shear modulus of ~ 220 GPa, Young’s modulus of ~ 500 GPa, hardness of ~ 20 GPa and fracture toughness of ~ 4.4 MPa m1/2. On the other hand, the flexural strength of the composites decreased as the VC content increased from 3 to 7 wt% and then it increased with further increasing the VC content to 10 wt%, with strength values of 620–770 MPa.
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Metadata
Title
Effects of VC additives on densification and elastic and mechanical properties of hot-pressed ZrB2–SiC composites
Author
Shuqi Guo
Publication date
28-11-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 6/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1850-7

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